NATE_TEST

So, Here Is The NATE Practice Exam

Good Luck

1. A condensing unit should be mounted on a slab that is level to:a. Allow any accumulated water to evenly run out of the cabinetb. Increase airflow through the fin areac. Prevent the unit from tipping overd. Make certain any top discharge air blows straight up

2. A simple time activated switch is an example of a control that does not use:a. Feedbackb. Electronicsc. Calibrationd. Manual adjustment

3. Which of the following systems would typically require a blower with a 2000 cfm output?

a. 2-ton ac systemb. 3-ton ac systemc. 5-ton ac systemd. 7.5-ton ac system

4. A typical induced draft furnace uses a blower-off delay in the cooling mode to:a. Increase the efficiency of the systemb. Air wash the coil on shutdownc. Minimize dehumidification at the coild. Prevent blowing moisture off the coil on shut off

5. 3,412 BTUa. 1 wattb. 3.4 wattsc. 1 kilowattd. 3.4 kilowatts

6. Which of the following would a technician use to check the operating sequence of an air conditioning system?

a. Schematicb. Pictorial diagramc. Illustrationd. Isometric drawing

7. Gas heating systems on roofs or other elevated locations shall be accessible by way of the building if the building is taller than;

a. 10 feetb. 15 feetc. 20 feetd. 25 feet

8. Rafters in typical residential construction are how far apart?a. 12 inchesb. 14 inchesc. 16 inchesd. 18 inches

9. Which of the following components is energized first after an intermittent ignition gas furnace calls for heat?

a. Induced draft motorb. Pilot valvec. Blower motord. Gas valve

10.To have a system automatically switch to heating or cooling as the load changes, the thermostat:

a. System switch should be in autob. System switch should be in offc. System switch should be ond. Fan switch should be in auto

11.A typical heat pump uses a high-pressure control to shut off the compressor if the condensing pressure becomes excessive. The control uses a switch that makes the compressor contact on a pressure

a. Rise at the compressor dischargeb. Fall at the compressor dischargec. Difference between the high and low sided. Combination of the high and low side

12.Which of the following is typically covered by local codes?a. Minimum cfm per outletb. Maximum length of a trunkc. Termination of condensate lined. Refrigerant charge

13.What is the difference between the wiring of an electromechanical thermostat and an electronic thermostat?

a. Both the hot leg and the common of a 120-volt supply must be run to the electronic thermostat.

b. Typically there is no difference, they are designed to be interchangeable

c. Wire size used on the electronic thermostat must be largerd. Both the low voltage hot and common must be run to the electronic

thermostat.

14.A secondary drain pan is used when an air conditioning system is located:a. Above a ceilingb. In a closetc. Below graded. More than 30 feet from a useable drain

15.A person is sitting near a cold window on a winter day. They are losing heat to the cold window by:

a. Conductionb. Convectionc. Radiationd. Evaporation

16. In electrical wiring, the black conductor usually indicates;a. The hot conductorb. The neutral conductorc. The ground wired. The safety wire

17.Which of the following is the correct equation for determining wattage in an electrical circuit?

a. W = E times Ib. W = E/Ic. W = I/Rd. W = E times R

18.The rpm of a motor is determined by:a. The motor’s voltageb. The motor’s amperagec. The number of polesd. The size of the motor windings

19.An ohmmeter reading of infinity across a switch means;a. The switch is openb. The switch is closedc. The switch is goodd. The switch is bad

20.The synchronous speed of a four pole 60 Hz single phase motor is:a. 3600 rpmb. 1500 rpmc. 3450 rpm

d. 1800 rpm

21.Contactors are rated according to the maximum amperage through the:a. Coilb. Contactsc. Thermostatd. Fuse

22.Lowering the airflow over an evaporator will:a. Increase the temperature drop of the air and increase the amount of

moisture removed from the air.b. Decrease the temperature drop of the air and increase the amount of

moisture removed from the air.c. Increase the temperature drop of the air and decrease the amount of

moisture removed from the air.d. Decrease the temperature drop of the air and decrease the amount of

moisture removed from the air.

23.What is the temperature rise of 250 cfm of air if an electric heater adds 8,500 btuh to the air?

a. 18 degrees Fb. 27 degrees Fc. 31.5 degrees Fd. 40 degrees F

24.When a compressor service valve is located on the compressor discharge and is back-seated;

a. The compressor is connected to the discharge piping.b. The back-seat port is closed to the compressor.c. The front-seat port is open to the compressor.d. All of the above are true.

25.The maximum secondary amperage of a 40VA, 240 by 24 volt control transformer would be;

a. 1.6 ampsb. 6 ampsc. 10.5 ampsd. .16 amps

26.A combination electrode/nozzle gauge can be used to perform which of the following tasks?

a. Remove the spark electrodeb. Remove the burner nozzle headc. Measure the nozzle pressured. Position the nozzle to the burner head

27.A single trunk duct system that extends in one or two directions from the unit and has multiple branches is a (an)

a. Perimeter duct systemb. Extended plenum duct systemc. Radial duct systemd. Reducing trunk system

28.After cutting copper tubing, the tube edge should be cleaned with a:a. Wire brushb. Hacksaw bladec. Round filed. Reamer

29.Which of the following is covered by the National Fire Protection Code?a. Wire sizingb. Use of return air sensorsc. Locations of service platformsd. Clearances around condensing units.

30.Maintaining manufacturer specified clearances on all sides of a condensing unit is:

a. Necessary in residential applications onlyb. Necessary in commercial applications onlyc. Only necessary if required by local codesd. Necessary whenever locating the equipment

31.Of the following, which is most likely powered by a supply voltage of 240V single phase?

a. Natural gas furnaceb. Residential condensing unitc. Commercial packaged unitd. Residential humidifier

32.Which of the following would be considered a good location to mount a wall thermostat?

a. In a kitchenb. In a bathroomc. On an exterior walld. Near a return grille

33.To have a system automatically switch to heating or cooling as the load changes, the thermostat must have:

a. System switch set in the cooling positionb. System switch set in the heating positionc. Fan switch set in the auto positiond. System switch set in the auto position

34.A heat pump operating in the heating mode with inadequate airflow across the indoor coil will typically have which of the following symptoms?

a. A higher than normal temperature rise across the outdoor coilb. A low than normal temperature rise across the outdoor coilc. A higher than normal temperature rise across the indoor coild. A lower than normal temperature rise across the indoor coil

35.Condensate piping must be properly trapped to prevent:a. Ice formation in colder temperaturesb. Condensate running off the evaporator coilc. Condensate overflowing the drain pand. Excessive air noise in the piping

36.A BTU is defined as the amount of heat that must be added to one ________ of water to raise its temperature one degree Fahrenheit.

a. Poundb. Ouncec. Quartd. Gallon

37. In a simple resistive circuit, the voltage is 24 volts and the current is 8 amps. According to Ohm’s law the resistance is:

a. 16 ohmsb. 3 ohmsc. 192 ohmsd. .5 ohms

38.A traverse joint is used to connect:a. Electrical wiringb. Ductworkc. Refrigerant pipingd. Condensate pipe

39.To determine the amount of sensible heat added to the refrigerant above the saturation point in an evaporator the installer would:

a. Perform a subcooling check on the liquid lineb. Perform a superheat check on the evaporator linec. Perform a cfm check across the evaporator coild. Perform a delta T check across the evaporator coil

40.To check a de-energized, normally open relay for fused contacts, a VOM would be set to check:

a. Ampsb. Voltagec. Currentd. Ohms

41.Which of the following oil furnace components should be replaced annually?a. Burner headb. Fuel filterc. Flame proverd. Combustion chamber

42.Pigtail 120 volt wires should be connected to the supply wiring by twisting the appropriate wires together insulating and securing each connection with:

a. Duct tapeb. Plastic tapec. Wire nutsd. Rubber electrical tape

43.Which of the following components is typically used only on induced draft condensing gas furnaces?

a. Electronic fan controlb. Hot surface ignitionc. Induced draft blower motord. Secondary heat exchanger

44.Proper control of temperature, humidity, air movement, air cleanliness and fresh air ventilation is:

a. To achieve a total comfort level in residential HVAC applications only.b. To achieve a total comfort level in commercial HVAC applications only.c. To achieve a total comfort level in any structure.d. To achieve a total comfort level in Southern states only.

45.7,000 BTU is approximately equal to _______ KW.a. Oneb. Twoc. Threed. Four

46.Which precaution should an installer perform to keep copper from oxidizing internally while brazing a connector to the tube?

a. Hold the torch flame centered over the connectorb. Purge the tube with an inert gas such as nitrogenc. Increase torch flame to its maximum settingd. Hold the torch flame on the tubing only

47.After connecting two sections of metal ductwork using drive cleats, you should:a. Bend the ends of the drives over the ductb. Bend the ends of the drives away from the ductc. Cut the ends of the drives offd. Crimp the ends of the drives and cut off

48.The term “sheathing” in the building trade refers to:a. Lumber used between roof beams or rafters as a base for roofing materialb. Lumber used to brace interior and exterior wallsc. Interior sheet rockd. Plywood decking in an attic

49.Which of the following areas of metal air duct design is often governed by municipal codes?

a. The size of air ductsb. The number of duct fittingsc. Thickness of duct insulationd. Type of connections made at duct joints

50.A customer needs the outdoor condensing unit replaced. Which of the following should the size of the outdoor unit be based upon?

a. The cooling load of the spaceb. The capacity of the evaporatorc. The size of the slabd. The available clearances around the unit

51.Customer complaints of “cold air blowing” from the registers of a properly charged heat pump system may be rectified by:

a. All supply registers are slightly undersized to increase air velocityb. Any sidewall mounted supply registers are slightly oversized to increase

air velocityc. Only ceiling supply registers are slightly undersized to increase air

velocityd. All supply registers are sized correctly for both throw and velocity

52.Fresh air intake ducts, used to route outdoor air to interior spaces, connect to the:a. Vent pipingb. Combustion air ductc. Supply side of the duct systemd. Return side of the duct system

53.According to the Uniform Mechanical Code, an attic-mounted furnace must have a permanently mounted light fixture. Where must the switch which controls this light be located?

a. At the main circuit panelb. Within reach of the furnacec. Within sight of the furnaced. At the required passageway opening

54. In the following sentence, which of the choices below would best simplify and still express the nearest meaning of the statement? “In my opinion, the new thermostat design is a change for the better”.

a. An improvementb. A step in the right directionc. A helpd. A badly needed modification

55.Metal duct that has hung for several years must be checked for sags and misalignments because:

a. They can place excessive stress on joints and sealsb. They increase static pressure in the ductc. They decrease static pressure in the ductd. They increase CFM at the diffusers

56.The typical procedure for repairing a small tear in the outer foil covering of a ductboard plenum is to:

a. Cover the tear with a vapor barrier such as a piece of plasticb. Cover the tear with an approved foil tapec. Wrap the section of ductboard with insulationd. Cut out an area 2 inches larger than the cut and insert a replacement plug

57.A thermistor is a component used in an electronic wall thermostat to measure:a. Temperatureb. Humidityc. Atmospheric pressured. Barometric pressure

58.Two-stage heat, single-stage cool thermostats are typically used on dual fuel heat pump systems that use oil heat for second stage heating. How would the heat pump operate if the second stage of the thermostat had an open circuit on an extremely cold day? Assume the emergency heat switch is not turned on.

a. The heat pump will operate on calls for heat without energizing the oil furnace.

b. The oil furnace will operate on calls for heat without energizing the heat pump.

c. Neither the heat pump nor the oil furnace will operate in heating modes.d. The oil furnace will operate in emergency heat mode only.

59.The slope of the condensate lines in an attic are often set by:a. Uniform Mechanical Codeb. Underwriterc. AGAd. ARI

60.Which of the following joints, when properly done, will best join a copper tube to a copper fitting?

a. Compressionb. Flare

c. Sweatd. Interference

61.Suction line refrigerant pressure and temperature are measurements needed to determine the:

a. Air temperatures entering and leaving the evaporator coil.b. Amount of refrigerant in a system.c. Subcooling of refrigerant leaving a condensing coil.d. Superheat in the refrigerant leaving an evaporator.

62.On startup, a natural gas heating system has “cold air” blowing from the registers. What could be the problem?

a. Burner manifold pressure is too high.b. Supply duct runs are too short.c. Blower “ON” delay is set too short.d. Blower “ON” delay is set too long.

63.A PSC condenser fan motor is not operating but the compressor runs. A voltage check of the condenser fan motor shows no voltage at the motor. Which of the following may be the cause?

a. Open run capacitorb. Shorted run capacitorc. Open motor windingsd. Poor or open wiring connection

64.Which of the following statements is true concerning state and local codes and regulations?

a. Local codes never override state codes.b. Local codes always override state codes.c. State codes always contain regulations that are more strict than local

codes.d. Local codes must be followed if they are more strict than state codes.

65.Which of the following instruments would typically be used to measure static and total pressure in a duct system?

a. Psychrometerb. Diaphragm type differential pressure gaugec. Portable air hoodd. Anemometer

66.Which of the following instruments must be used with the power de-energized?a. Voltmeterb. Ohmmeterc. Ammeterd. Wattmeter

67.A customer asks that you do something that your company rules specifically prohibit. When responding to their request you should:

a. Tell the customer you cannot comply with their request and leave it at that.b. Explore with the customer the circumstances under which you might do it.c. Tell the customer you cannot comply with their request and offer a brief

explanation why you can’t.d. Whenever possible prevent a conflict and go ahead and do it.

68.Blower belt noise is caused by which of the following?a. Over voltage to the motor.b. Worn pulleyc. Under voltage to the motor.d. Wrong blower whee

69.While checking the installation of attic mounted flexible duct, you find 7 to 9 foot spacing between duct supports. What steps if any, should be taken?

a. No steps are necessary unless the spacing is greater than 10 feet.b. No steps are necessary since the spacings are greater than 5 feet.c. All supports must be relocated to maintain a maximum spacing of 5 feet.d. All supports must be relocated to maintain a minimum spacing of 7 feet.

70.A vapor charged temperature control uses what in its power element?a. Oilb. Waterc. Antifreezed. Refrigerant

71. Isolation collars are typically added to ductwork to:a. Reduce vibration noiseb. Reduce static pressurec. Reduce heat gaind. Increase air velocity

72.On a typical 120 volt three prong electrical receptacle, the hot wire should be:a. The narrow slotb. The wide slotc. Both the narrow and wide slotsd. The round slot

73.Each phase of three-phase power is ______ degrees out of phase from each other.a. 60 degreesb. 45 degreesc. 90 degreesd. 120 degrees

74.Two 5mfd capacitors are in series with one another. The total capacitance of the two is:

a. 2.5mfdb. 5mfdc. 10mfdd. None of these.

75. Three 10mfd capacitors are connected in parallel with each other. The total capacitance of the three is:

a. 10mfdb. 20mfdc. 30mfdd. None of these

76.The air temperature drop across an evaporator is measured and determined to be 30 degrees Fahrenheit. Which of the following is most likely true?

a. There is too much evaporator airflow.b. There is too little evaporator airflow.c. The system is overcharged.d. The system is undercharged.

77.The square root of the number 9 is:a. 1.5b. 2c. 3d. 6

78.Air flows from an 8-inch duct where the duct is reduced to 6 inches. Which of the following is true?

a. The air velocity increasesb. The air velocity decreasesc. The CFM increasesd. The CFM decreases

79.Which of the following is true about compression ratio:a. It is the absolute high side pressure divided into the absolute suction

pressure.b. It is the absolute suction pressure divided into the absolute high side

pressure.c. It is the high side pressure in psig divided into the suction pressure in psig.d. It is the suction pressure in psig divided into the high side pressure in psig.

80.The speed of a three-phase motor is determined by:

a. The voltage to the motorb. The current draw of the motor.c. The frequency of the power supplied to the motor.

d. The number of poles in the motor.

81.Which one of the following fuse types should be used to protect the condensing unit on a residential split system air conditioning system.

a. Time-delayb. Instant blowc. Fast reactingd. Series rated ground-fault

82.Which of the following organizations rates electrical components and equipment for electrical safety?

a. ARIb. ULc. RSESd. ASHRAE

83.On a heat pump the “balance point” is:a. The point at which the heat loss of a structure matches the heat pump

capacity.b. The point at which the heating load calculation matches the cooling load

calculation.c. The lowest effective outside temperature at which the heat pump can

operate.d. The most effective temperature where the heat pump’s electric auxiliary

heat should be energized.

84.On a system using a reciprocating compressor, raising the evaporator pressure and/or lowering the condensing pressure will:

a. Decrease the compressor’s volumetric efficiency.b. Increase the compressor’s volumetric efficiency.c. Have no effect of volumetric efficiency.d. Increase the compressor’s power consumption.

85.A heat anticipator in a typical thermostat is wired:a. In series with the “R” terminalb. In parallel with the “R” terminalc. In series with the “W” terminald. In parallel with the “W” terminal

86.To test a capacitor with an ohmmeter, the ohmmeter should be set at:a. The R times 1 scaleb. The R times 10 scalec. The R times 100 scaled. The highest ohms scale available

87.Which of the following is considered a good evacuation?

a. 2000 micronsb. 1500 micronsc. 1000 micronsd. 500 microns or less.

88.A filter-drier has a temperature drop across it. Which of the following is true about the filter-drier?

a. It is partially pluggedb. It is totally pluggedc. A temperature drop across it is normald. The filter-drier has not yet broken in

89.An FRN-R fuse is:a. A time delay fuseb. An instant blow fusec. Neither A nor B is trued. Only used on non-inductive circuits

90.A fuse must be selected according to:a. Type, amperage and voltageb. Type and amperagec. Type and voltaged. Type, amperage, voltage and wattage

91.On a typical three terminal single-phase fully hermetic compressor, between which two terminals is the start winding located?

a. The two with the highest resistanceb. The two with the least resistancec. The two with the middle resistanced. The two with continuity to ground

92.A Ground Fault Circuit Interrupter monitors:a. The current between the hot wire and groundb. The current between the hot wire and the neutral wirec. The current between the neutral wire and groundd. The voltage across the line

93.Typical bypass humidifiers are connected:a. Between the supply and the return ducts.b. Between the supply and outside air intakec. Between the outside air intake and return air ductd. Between the exhaust air and return air ducts.

94.The typical bypass humidifier does not work well with which of the following heating system types?

a. Natural gas

b. Propane gasc. Heat pumps & electric heatd. Oil fired furnaces

95.During the heating season a damper located in the bypass duct of a bypass humidifier must be:

a. Closedb. Openc. Adjusted according to the temperature rise of the furnaced. Adjusted according to the total cfm of the duct system.

96.As air is heated its relative humidity:a. Increasesb. Decreasesc. Remains the samed. None of these is correct

97.A sling Psychrometer measures:a. Dew point temperatureb. Specific humidityc. Relative humidityd. Dry & wet bulb temperatures

98.A protractor is best used to:a. Measure distanceb. Layout anglesc. Determine air velocityd. Select a contractor

99.Which of the following is the most accurate method of balancing a duct system?a. Proportional balancingb. Sequential balancingc. Temperature balancingd. Total pressure balancing

100. Which of the following statements most correctly defines the difference between “accuracy” and “precision” in instruments?

a. There is no difference between the two terms.b. “Accuracy” refers to how close the measurement is to the actual value

being measured while “precision” refers to how small a value can be measured.

c. “Accuracy” refers to how small a value can be measured while “precision” refers to how close the reading is to the actual value.

d. “Accuracy” refers to the repeatability of the measurement while “precision” refers to the percentage of error in the reading.

NATE Practice

Multiple ChoiceIdentify the choice that best completes the statement or answers the question.

1. A technician is servicing a package cooling system that has an open overload onthe indoor blower motor. Which of the following multimeter readings would indicate this?a. 240 VAC across the motor -

normal ampsc. 0 VAC across the motor - 0 amps

b. 120 VAC across the motor -higher than normal amps

d. 240 VAC across the motor - 0 amps

ANSWER: DPOINTS: 0 / 1

2. A proper trap is required in a condensate linea. for correct drainage of the pan c. to prevent air and odors from

entering the systemb. to prevent insect invasion of the

systemd. all of the above

ANSWER: CPOINTS: 0 / 1

3. Suction line pressure and temperature measurements are needed toa. determine the evaporator split c. determine operating superheatb. determine operating sub-cooling d. know the weight of the refrigerant

charge


4. Which of the following is covered by the National Fire Protection Code?a. wire sizing c. location of service platformsb. use of return air sensors d. clearances around condensing

units

ANSWER: BPOINTS: 0 / 1

5. What legal condition exists after a verifiable verbal agreement is reached between a customer and a contractor?a. the contractor may be liable for the c. no legal condition exists unitil

bid both parties attorneys have signed the agreement

b. either party can terminated the agreement within 7 days

d. no legal condition exists until a written agreement is signed

ANSWER: APOINTS: 0 / 1

6. Proper sizing of an expansion valve is important becausea. too large of a valve cause erratic

operation and too small of a valve causes excessive pressure drop

c. the larger the valve the higher its superheat setting

b. too small of a valve cause erratic operation and too large of a valve causes excessive pressure drop

d. the smaller the valve the higher its superheat setting


7. to avoid possible condensing unit noise complaints, the installer shoulda. cover the fin area with waterproof

insulationc. remove all shrubs from the area

b. consider the location before installing

d. bolt the condensing unit to the slab


8. Which of the choices below would best simplify and still express the meaning of the words in bold? In my opinion, the new thermostat design is a change for the better.a. an improvement c. a helpb. a step in the right direction d. a badly needed modification


9. Which of the following can cause refrigerant gauges to act erratically?a. low outdoor ambient c. oil in the gauges or hosesb. high outdoor ambient d. low oil levels in the system


10. In a simple resistive circuit, the voltage is 120VAC and the current is 4 amps. What is the restance of the circuit?

a. 480 ohms c. 30 ohmsb. 3 ohms d. 0.3 ohms


11. The number of air changes required in a commercial stucture can be found in ____ specifications.a. ARI c. OSHAb. ASHRAE d. Uniform Mechanical Code


12. A thermistor is a component used in an electronic thermostat toa. measure temperature c. record atmospheric pressureb. measure humidity d. log time events


13. Excessive liquid line length and/or lift can causea. flash gas in the liquid line c. ice on the condenser coilb. low superheat d. high liquid line pressures


14. A persistant persona. always agrees with with

everything said by another personc. stays the course no matter how

difficultb. sticks with their friends no matter

what they have doned. constantly disagrees with you


15. After cutting pipe or tubing the end should be cleaneda. with a wire brush c. with a round fileb. with a hacksaw blade d. with a reamer


16. A tripped internal overload on a hermetic compressor should be reset bya. cycling the wall thermostat c. waiting for it cool down

b. press the manual reset button d. replacing the overload


17. On a Preventative MAintenance call, a technician notices that the low voltage wire to a condensing unit has been frayed by a lawn trimmer. What should be done?a. replace and bury the new wire c. relocate the wire and cover with

tapeb. tape the frayed wire and bury it d. replace the wire and relocate it on

the unit


18. Why must a contract include commitments from both parties?a. to let each know their

responsibilitiesc. to make the contract legally

bindingb. because it is federal law d. to make the contract warranty

unlimited


19. to check a de-energized NO relay for welded or stuck contacts, the multi-meter should be set to checka. watts c. volts b. ohms d. amps


20. If you purchased 5 contactors for $55.85, what is the price for one contactor?a. 10.25 c. 13.19b. 11.17 d. 9.95


21. A condensing unit should be installed levela. to allow water to run out of the

cabinet evenlyc. prevent the unit from becoming oil

loggedb. increase airflow through the fin

aread. to ensure the air discharges

straight up


22. Packaged units should not be installed a. on a concrete slab c. directly on the groundb. wooden timbers d. on legs


23. Carefully choosing questions that reveal a customer’s true feelings isa. to be avoided when dealing with a

customer that has a complaintc. not as important as getting as

many questions as possible answered

b. a good technique to use when dealing with a customer that has a complaint

d. a procedure that should only be used when dealing with a satisfied customer


24. When installing condensate drains, which of the following is set by the Uniform Mechanical Code?a. size of secondary drain pipe c. distance to the final drainb. maximum number of connections

permittedd. maximum drop to the drain


25. Which of the following is most likely powered by 240 VAC single phase?a. natural gas furnace c. commercial package unitb. residential condensing unit d. residential humidifier


26. Which of the following is usually covered by local codes?a. maximum CFM per diffuser c. refrigerant line sizingb. wire sizing d. location of condensate drains


27. Which of the following would cause a motor to reverse rotationa. disconnect one lead of a single c. reverse the connections on the run

phase power supply capacitorb. reverse the connections on a single

phase power supplyd. switch any two leads of a three

phase power supply


28. A proper evacuation of of a refrigerant circuit to remove non-condensablesa. will ensure higher condensing

temperaturec. will reduce suction pressure drop

b. higher suction pressure d. improve efficiancy and capacity


29. If the number of poles in a PSC motor are reduced from 4 to 2, what happens to the RPMa. decreases c. stays the sameb. increases d. RPM is not affected by the number

of poles


30. Decreasing the diameter of the motor pulley willa. decrease motor RPM c. increase motor RPMb. decrease CFM output d. increase CFM output


31. The slope of the condensate lines in an attic are often set bya. Underwriter’s Laboratory c. ARIb. AGA d. Uniform Mechanical Code


32. What should be done to prevent scale formation (oxidizing) when brazing copper tubing?a. purge with an inert gas such as

nitrogenc. hold the torch steady over the

fittingb. keep the flame as hot as possible d. apply heat only to the fitting, not

the tube

ANSWER: A

POINTS: 0 / 1

33. To determine the amount of sensible heat added to the refrigerant above its saturation point, the technician woulda. check sub-cooling c. check superheatb. check amp draw d. measure coil split


34. Which of the following would be used to determine the sequence of operation for an air-conditioner?a. schematic diagram c. illustrationb. pictorial diagram d. isometric drawing


35. If you add each of the angles of a trianle together the result would bea. 360º c. 45ºb. 90º d. 180º


36. On a call to a 1 year old system a technician finds that the air volume to all rooms is low and the customer complains that the unit slowly stopped cooling as well as it did when new. The most likely problem isa. bad fan blade c. dirty filterb. low refrigerant charge d. bad blower motor


37. Condensation on the suction line of an air-conditioner is a concern whena. lines are in a wall c. lines are exposed outdoorsb. lines are underground d. in a package AC unit


38. a vapor charged temperature control uses _____ in its power element.a. oil c. refrigerantb. water d. glycol

ANSWER: C

POINTS: 0 / 1

39. 3,412 BTUs is equal to _______ watts.a. 1 c. 746b. 1000 d. 10kw


40. EPA regulations require that recovered refrigerant be useda. only in the equipment it came

fromc. any equipment owned by the same

person(s)b. any equipment with the same type

of refrigerantd. any equipment as long as it has

been recycled


41. To minimize refrigerant migration to the compressor, the technician should install aa. compressor time delay c. a crankcase heaterb. condenser low ambient kit d. a fixed orifice metering device


42. To reduce the diameter of the end of a piece of round duct, the installer would usually usea. a punch c. a notching toolb. a hand seamer d. a hand crimper


43. On a service call to an R-22 unit with a low pressure freeze protection control the technician finds that the control occansionally trips on start-up buns normally once it statrs. The most likely problem isa. the control has drifted to an

excessively high cut-outc. the internal overload is opening

b. he control has drifted to an excessively high cut-out

d. the unit is overcharged


44. A traverse joint is used

a. to connect electrical wiring c. to connect refrigerant linesb. to connect duct work d. to connect condensate piping


45. What instrument is used to measure air pressure in a duct system?a. psychrometer c. magnehelicb. velometer d. anemometer


46. A customer asks you to do something that your company rules expressly forbid. You shoulda. just tell the customer that you

cannot complyc. tell the customer you cannot

comply and briefly explain whyb. discuss the circumstances by

which you may do itd. to avoid loosing the customer, just

do it.


47. Maintaining manufacturer’s specified clearances isa. necessary only on residential

systemsc. necessary only when required by

local codeb. necessary only on commercial

systemsd. always necessary


48. When brazing, capillary actiona. allows flux to flow more easily c. reduces the melting point of the

brazing alloyb. causes the filler metal to flow

throughout the joint more evenlyd. allows the joint to be sealed

without a filler metal


49. Indoor air quality can be reduced bya. oversized supply diffusers c. low supply air humidityb. undersized supply diffusers d. excessive humidity in supply air

ANSWER: D

POINTS: 0 / 1

50. What purpose is served by performing a resistance check from each compressor terminal to ground?a. to determine correct phase rotation c. to identify the terminalsb. to check for possible path to

groundd. to check for possible open

windings


51. What would be a good location for the wall thermostat?a. on any exterior wall c. in the kitchenb. near the main return air grill d. it does not matter


52. Which of the following tasks would MOST require wearing safety glasses or goggles?a. cutting cap tube c. programming a thermostatb. changing vacuum pump oil d. brazing copper tubing


53. A time activated switch is an example of a control that does not usea. feedback c. calibrationb. electronics d. manual adjustment


54. An understanding of correct response procedures for accidents involving refrigerants is a requirement ofa. all equipment manufacturers c. the NFPAb. all refrigerant manufacturers d. the federal government


55. Which of the following is used to express the efficiancy of an air-conditionera. AFUE c. COPb. SEER d. LRA

ANSWER: B


POINTS: 0 / 1

56. Moisture remaining in a system following evacuationa. will be removed by the drier c. removed by the receiverb. trapped in the accumulator d. will cause no harm


57. Which of the following would most likely require supply registers to be located in the floor of both upper and lower floors of a two story home?a. in colder climates with the furnace

in the basementc. in armer climates with the furnace

in the atticb. in colder climates with the furnace

in the atticd. in warmer climates with the

furnace in the basement


58. Which of the following requires an evacuation to 0 PSIG according to EPA section 608 regulations?a. an Air-conditioner containing less

than 200 lbs of R-22c. an Air-conditioner containing less

than 25 lbs of R-502b. an Air-conditioner containing

more than 200 lbs of R-22d. an Air-conditioner containing

more than 25 lbs of R-502


59. Isolation collars are typically added to ductwork toa. reduce vibration noise c. reduce heat gainb. reduce static pressure d. increase velocity


60. To calculate CFM of airflow in a duct you would needa. static pressure and duct length c. duct length and air velocityb. cross sectional area and length d. cross sectional area and air

velocity

5.

What legal condition exists after a verifiable verbal agreement is reached between a customer and a contractor?a. the contractor may be liable for the bid c. no legal condition exists unitil both

parties attorneys have signed the agreement

b. either party can terminated the agreement within 7 days

d. no legal condition exists until a written agreement is signed

10.

In a simple resistive circuit, the voltage is 120VAC and the current is 4 amps. What is the restance of the circuit?a. 480 ohms c. 30 ohmsb. 3 ohms d. 0.3 ohms


20.

If you purchased 5 contactors for $55.85, what is the price for one contactor?a. 10.25 c. 13.19b. 11.17 d. 9.95


30.

Decreasing the diameter of the motor pulley willa. decrease motor RPM c. increase motor RPMb. decrease CFM output d. increase CFM output


40.

EPA regulations require that recovered refrigerant be useda. only in the equipment it came from c. any equipment owned by the same

person(s)b. any equipment with the same type of

refrigerantd. any equipment as long as it has been

recycled


50.

What purpose is served by performing a resistance check from each compressor terminal to ground?a. to determine correct phase rotation c. to identify the terminalsb. to check for possible path to ground d. to check for possible open windings


60.

To calculate CFM of airflow in a duct you would needa. static pressure and duct length c. duct length and air velocityb. cross sectional area and length d. cross sectional area and air velocity


16.

A tripped internal overload on a hermetic compressor should be reset bya. cycling the wall thermostat c. waiting for it cool downb. press the manual reset button d. replacing the overload

ANSWER: CPOINTS: 0 / 1NEC Practice

Multiple ChoiceIdentify the letter of the choice that best completes the statement or answers the question.

1. The meaning of approved is ____.a. listed by a Nationally Recognized Testing Laboratory (NRTL)b. acceptable to the National Electrical Code®c. acceptable to the architect or engineer designing the jobd. acceptable to the authority having jurisdiction


2. As defined in Article 100, a dwelling unit has the following feature(s) ____.a. permanent provisions for cookingb. a basement or storage areac. space for eating, sleeping, and recreationd. both a and c


3. In the international system of units, the prefix kilo- means ____.a. hundredb. thousandc. milliond. billion


4. In the international system of units, the prefix milli- means ____.a. one hundredthb. one thousandthc. one millionthd. one billionth


5. The National Electrical Code® shows measurements in which system of units first?a. inch-pound (English)b. SI (metric)c. alternates between the two systemsd. does not contain measurements


6. Nationally Recognized Testing Laboratories (NRTL) ____ electrical products to provide a basis for approval by inspectors in the field.a. approveb. test and listc. rated. none of these

ANSWER: B

POINTS: 0 / 1

7. The purpose of electrical symbols on plans is ____.a. to allow bilingual plans by eliminating wordsb. to graphically represent electrical products and systemsc. to provide a code to prevent untrained persons from doing electrical

workd. all of these


8. All of the following items of electrical equipment are devices, except for ____.a. receptacleb. three-way switchc. light bulbd. disconnect switch


9. Branch-circuit conductors at outlet boxes are required to have at least ____ inches of free length for making splices and connections. The length of conductor is measured is from where the conductors enter the box.a. 4b. 6c. 8d. 12


10. NEC® 300.15 requires that a ____ be installed at each conductor splice or connection point.a. insulated wire connectorb. outlet boxc. grounding electrode conductord. none of these


11. According to the NEC®, unless “listed” for the purpose, electrical wall boxes shall not be mounted back-to-back in walls because ____.a. sound may be transmitted from room to room.

b. it reduces the fire resistance of the wall.c. there is not sufficient room in the wall cavity to mount electrical

wall boxes back-to-back.d. all of these.


12. According to ____, unused knockouts and other openings in electrical boxes and cabinets are required to be closed.a. Article 250b. NEC® 110.12(A)c. NEC® 314.17 (D), Fine Print Noted. both b and c


13. In construction of one- and two-family dwellings, the electrical circuits are usually designed by the ____.a. electricianb. architectc. consulting engineer


14. All of the following are included when calculating the usable area of a dwelling to compute the required lighting load, except for ____.a. living roomb. crawl spacec. finished basementd. powder rooms


15. A 20-ampere branch circuit requires ____ conductors, ignoring the effects of voltage drop.a. 14 AWG copperb. 14 AWG aluminumc. 12 AWG copperd. 12 AWG aluminum


16. Article 210 provides ____ guidelines for locating receptacle outlets in residences.a. mandatoryb. recommendedc. maximumd. both a and c


17. Grounding-type receptacles are permitted to be installed with the grounding terminal ____.a. upb. downc. sidewaysd. all of these


18. Is a receptacle required on a 3 ft (900 mm) wall space behind a door that is normally left open?a. yesb. no


19. Small appliance receptacle outlets ____ required to be included in the 3 volt-ampere per square foot load calculation.a. areb. are not


20. The Code generally requires receptacles installed in a garage to be GFCI-protected. The exception(s) to this rule include ____.a. receptacles that are not readily accessible, such as a ceiling

receptacle installed to serve an automatic garage door operatorb. a single receptacle installed for a refrigerator or freezer located in a

dedicated space, or a duplex receptacle installed for two appliances (refrigerator and freezer) located in a dedicated space

c. a single receptacles installed to serve an alarm systemd. all of the above


21. A receptacle shall be installed in a hallway that measures ____ feet. or more measured along the centerline of the hallwaya. 6b. 9c. 10


22. Wire sizes up through No. 4/0 are expressed in American Wire Gauge (AWG). Wire sizes larger than 4/0 AWG are expressed in ____.a. metric unitsb. kcmilc. diameterd. radians


23. The smallest wire size for which overcurrent protection is specified in the Code is ____.a. 20 AWGb. 18 AWGc. 16 AWGd. 14 AWG


24. Section 310.3 requires that conductors 8 AWG and larger must be ____ when installed in a raceway.a. groundedb. bondedc. strandedd. none of these


25. Older electrical books and plans sometimes use the term "MCM," which means the same thing as ____.a. metric

b. kcmilc. A.I.C.d. GFCI


26. The rating of a branch circuit is determined by its ____.a. overcurrent protective device (fuse or circuit-breaker)b. wire sizec. demand factord. connected load


27. When a branch circuit supplies both equipment fastened in place (such as lighting) and cord-and-plug connected equipment, the permanently installed equipment shall not exceed ____ percent of the branch circuit rating.a. 30b. 50c. 75d. 90


28. For a given conductor size, which of the following material has the greatest ampacity?a. copperb. copper-clad aluminumc. aluminumd. both b and c


29. Connectors marked ____ are suitable for use with aluminum, copper, or copper-clad conductors. Connectors not so marked are for use with copper conductors only.a. CO-ALRb. AL/CUc. UL 9d. both a and b


30. Table 310.16 gives allowable ampacities of copper conductors with various types of insulation. When conductors will be used in ambient temperatures exceeding 30°C (86°F), the ____ for the table must be applied.a. notesb. correction factorsc. temperature limitsd. Examples in Chapter 9, NEC®


31. Article 210 applies to branch circuits, but branch-circuit calculations are covered in ____.a. Article 220b. Article 230c. Article 240d. Chapter 9, Examples


32. Under certain circumstances, the grounded conductors of a residential service ____ permitted to be sized smaller than the phase conductors.a. areb. are not


33. Low voltage (high voltage drop) in a home can be caused by ____.a. a conductor that is too small for the loadb. a circuit that is too longc. poor connections at the terminalsd. all of these


34. Closed-loop and programmed power systems for residences are covered in Article ____.a. 210b. 240c. 300

d. 780


35. Cables run parallel to (along) or through holes bored in framing members must be at least ____ from the edge of the framing member.a. 1/2 inches (13 mm)b. 1 inches (25 mm)c. 1 1/4 inches (32 mm)d. 2 inches (50 mm)


36. Armored cable includes a(n) ____ to insure a low-impedance grounding path.a. insulated equipment grounding conductor (green ground)b. bare equipment grounding conductorc. internal bonding stripd. interlocking armor


37. Type AC cable is manufactured with ____ phase conductors.a. twob. threec. fourd. all of these


38. Support and physical protection requirements for Type AC cable are similar to those for ____.a. Type NM cableb. electric metallic tubingc. Type MI cabled. none of these


39. The maximum number of Type NM cables that can be inserted into a connector is ____.

a. oneb. twoc. one, unless listed for mored. none of these


40. Liquidtight flexible nonmetallic conduit is subject to which of the following limitations?a. cannot be used in direct sunlight, unless marked for this applicationb. can become brittle in extremely cold temperaturesc. cannot be direct-buried, except when marked for this applicationd. all of these


41. When wiring houses with Type NM cable and metal boxes, to avoid the possibility of induction heating, all conductors of the same circuit shall be ____.a. in the same cableb. in separate cables


42. Phase conductors 6 AWG and smaller ____ permitted to be re-identified as equipment ground conductors using green paint, tape, or other effective means.a. areb. are not


43. When using conduit wiring methods, which of the following colors of insulation or marking are permitted to identify "hot" phase conductors?a. black, red, and blue for 120/208-volt systemsb. yellow, orange, and brown for 277/480-volt systemsc. any colors except white, gray, or greend. all of these


44. Alternating current, general-use snap switches are UL-listed to control motors rated up to ____ horsepower.a. 1/2b. 3/4c. 2d. as marked on the switch


45. NEC® 404.2(A) requires that switching be done only in the ____ conductor.a. ungroundedb. designatedc. blackd. red


46. On isolated ground receptacles, the metal yoke ____ integrally bonded to the equipment grounding terminal of the receptacle.a. isb. is not


47. To avoid inductive heating in metallic raceways, NEC® 300.20 requires that ____.a. all circuit conductors be run in the same racewayb. the grounded (neutral) conductor be oversizedc. the equipment grounding conductor be bonded to the racewayd. none of these


48. Which of the following underground feeder installations to a remote building "meets Code"?

a. Ab. B


49. When an existing two-wire, nongrounding-type receptacle is replaced in a location where the Code requires a GFCI receptacle, it is permitted to be replaced by a ____.a. GFCI receptacleb. two-wire, nongrounding-type receptaclec. three-wire, grounding-type receptacled. all of these


50. Luminaire is a term that refers to ____.a. incandescent lighting fixturesb. fluorescent lighting fixturesc. outdoor pole-mounted fixturesd. both a and b


51. Overheating of luminaires (fixtures), which often results in fires, is most often caused by ____.a. burying recessed fixtures under thermal insulationb. failure to ground metal fixture bodies properlyc. overlampingd. both a and c

ANSWER: D

POINTS: 0 / 1

52. Information about what types of luminaires (fixtures) are suitable for which types of installations can be found in ____.a. National Electrical Code®b. UL General Information About Electrical Products (white book)c. UL Electrical Construction Materials Directory (green book)d. all of these


53. In addition to National Electrical Code® requirements, some areas have ____ requirements for energy conservation that also affect lighting fixture selection.a. seismicb. building codec. statutoryd. EPA


54. NEC® 410.16(C) requires that when a suspended ceiling grid is used to support lay-in type lighting fixtures, ____.a. the grid be securely fastened together and secured to the building

structure with bolts, screws, or rivets.b. the lay-in fixtures be securely fastened to the grid members using

bolts, screws, rivets, or listed clipsc. the fixtures be Class P ratedd. both a and b


55. All of the following are types of fluorescent ballasts, except for ____.a. pre-heatb. rapid startc. instant startd. capacitor-boost


56. Which of the following lamp types generally performs badly in low temperatures?

a. incandescentb. fluorescentc. metal halide


57. Many electricians wire the lights and receptacles in a room on different circuits because this ____.a. is required by the NEC®b. is required by building Codesc. offers the advantage that all power in a room will not go out if the

overcurrent protective device tripsd. simplifies grounding


58. Residential wiring plans generally show lighting and receptacle outlet locations but not circuits. The electrician should design the installation with which of the following in mind: ____.a. economy - minimizing the number and length of circuitsb. convenience for the homeowner or other userc. National Electrical Code® requirementsd. all of these


59. Which of the following rules of thumb can be followed when planning branch circuits for dwelling units?a. one 15-ampere lighting circuit for every 600 square feet (55.74

square meters)b. one 20-ampere lighting circuit for every 800 square feet (74.32

square meters)c. load circuits to no more than 80% of their ratingd. all of these


60. The maximum volt-ampere loading permitted on a 15-ampere branch circuit is ____.a. 1,440 VAb. 1,800 VAc. 1,920 VA

d. 2,400 VA


61. Which of the following switch types is rarely used in residential wiring?a. single-poleb. double-polec. three-wayd. four-way


62. A rotary light dimmer ____ suitable for use as a ceiling-suspended (paddle)fan speed control.a. isb. is not


63. Residential receptacles are required to be installed so that the grounding slot is located on the ____.a. bottom or right sideb. top or left sidec. either a or bd. none of these


64. Ceiling-suspended (paddle) fans weighing more than ____ pounds are required to be supported independently of the outlet box.a. 15b. 25c. 35d. 50


65. A raised plaster cover (often called a plaster ring or mud ring) is permitted to increase the maximum number of conductors permitted in an outlet box when it is ____.a. listed as a box extension

b. by the same manufacturer as the boxc. marked with its cubic-inch volumed. metallic and capable of being grounded


66. Ceiling-suspended (paddle) fan speed can be controlled by ____.a. pull chain on the fanb. speed control mounted in a wall boxc. remote-control similar to TV/VCR typed. any of these


67. NEC® 210.12 requires that ____ protection be provided for all electrical outlets in residential bedrooms.a. ground-fault circuit interrupter (GFCI)b. arc-fault circuit interrupter (AFCI)c. both a and b


68. A bathroom is defined as "an area including a basin, with one or more of the following ____.a. toiletb. tubc. showerd. any of these


69. The 20-ampere branch circuit required for bathroom receptacles is permitted to serve equipment other than receptacles only under which of the following conditions?a. when the circuit is protected by a GFCI circuit-breakerb. when the circuit supplies a single bathroomc. when the receptacle is built into the lighting fixtured. either a or b


70. Receptacles installed in bathrooms are required to be ____ protected.a. GFCIb. AFCIc. water-proof


71. Fluorescent lamps are color-rated in terms of degrees Kelvin, which express temperature above absolute zero (-273°F). The ____ the degrees Kelvin, the ____ the color tone.a. lower, coolerb. higher, warmerc. lower, warmerd. cooler, higher


72. Some portable appliances use double insulation in place of grounding to provide shock protection to users. Double-insulated appliances normally have ____ power cords and attachment plug caps.a. three-wireb. 16 AWG or largerc. Type SJTd. two-wire


73. GFCI-protected receptacles ____ permitted to be installed within a tub or shower space.a. areb. are not


74. Luminaires (fixtures) intended for installation in wet locations must be ____.a. marked "Class W"b. marked "Suitable for Wet Locations"c. both a and b


75. Kitchen lighting ____ permitted to be supplied by the two 20-ampere small-appliance circuits required for the kitchen and dining room area.a. isb. is not


76. GFCI protection can be provided for receptacles serving kitchen countertop areas by ____.a. GFCI circuit-breakers on the two required 20-ampere small

appliance branch circuits.b. installing a GFCI-protected receptacle at each location.c. installing two feed-through type GFCI receptacles. One to protect

downstream receptacles on one of the two required 20-ampere small appliance branch circuits, and the other to protect downstream receptacles on the other required 20-ampere small appliance branch circuit.

d. all of these.


77. Three-wire circuits are more efficient and cost effective than two-wire circuits, because they permit ____.a. fewer conductorsb. smaller racewaysc. reduced voltage dropd. all of these


78. Improper wiring or mishandling of multi-wire branch circuits can cause ____ connected to the circuit.a. overloading of the ungrounded conductorb. overloading of the grounded “neutral” conductorc. destruction of equipment because of overvoltaged. both b and c


79. The load for each small-appliance, branch circuit load is required to be calculated at ____.

a. 1,440 wattsb. 1,500 volt-amperesc. 1,920 wattsd. 2,400 volt-amperes


80. Outdoor weatherproof receptacles ____ permitted to be connected to a 20-ampere, small-appliance branch-circuit serving a kitchen or dining area.a. areb. are not


81. The 125-volt, 20-ampere receptacles installed to serve kitchen countertops are required to have GFCI protection ____.a. when they are within 6 feet (1.8 m)of the sinkb. under all circumstancesc. unless provided with assured grounding conductor protectiond. none of these


82. An electric circuit consists of the ____.a. power sourceb. conductorsc. loadd. all of the above


83. Which of the following is required in order to dim fluorescent fixtures?a. fluorescent dimmerb. dimming ballastsc. oversized neutral in the branch-circuitd. both a and b


84. All electrical outlets in residential bedrooms shall be protected by ____.a. ground-fault circuit interrupters

b. arc-fault circuit interruptersc. nonmetallic faceplates


85. When laying out the wall receptacle locations in a bedroom, make sure that a receptacle is installed so that no point along the floor line is more than ____ from a receptacle.a. 6 feet (1.8m)b. 9 feet (2.7m)c. 12 feet (3.7m)


86. Cord sets rated 40, 45, or 50 amperes are usually called ____ cords, and cord sets rated 30 amperes are called ____ cords.a. SJT, SJb. range, dryerc. heavy-duty, extra heavy-dutyd. washer, dryer


87. NEC® 422.60(A) requires that an appliance nameplate show ____.a. The appliance rating in volts and amperesb. the maximum overcurrent protectionc. the appliance connected load in volts and wattsd. either a or c


88. Which of the following are acceptable disconnecting means for appliances?a. a circuit-breaker in sight of the applianceb. a circuit-breaker or switch capable of being locked in the off

positionc. a horsepower-rated switchd. an attachment cord and pluge. all of the above

ANSWER: EPOINTS: 0 / 1

89. A "unit switch" used as a disconnecting means for an electric clothes dryer shall ____.a. be horsepower-ratedb. interrupt all ungrounded circuit conductorsc. have a NEMA 3R enclosure when installed outdoorsd. both a and b


90. A porcelain lampholder with a pull-chain ____ permitted to serve as the lighting outlet required by NEC® 210.70(A)(3).a. isb. is not


91. To provide shock protection, low-voltage wiring systems are required by Article 411 to be ____.a. double-insulatedb. groundedc. supplied though isolating transformersd. all of these


92. Type UF "underground feeder" cable ____ permitted to be used to supply service entrances.a. isb. is not


93. The minimum depth for a 120-volt, 15-ampere, GFCI-protected circuit to an outdoor pole light run under a paved driveway is ____.a. 6 inches (150 mm)b. 12 inches (300)c. 18 inches (450 mm)d. 24 inches (600 mm)


94. While multi-wire branch circuits are sometimes used in residential wiring, there is the remote possibility that if the grounded (neutral) conductor opens, the line-to-line voltage on the ungrounded (phase) conductors will divide between the connected line-to-neutral loads. Depending upon the value of these connected loads, the ____ can rise high enough to damage equipment connected to the circuit.a. currentb. voltagec. ground potentiald. resistance


95. The minimum diameter of flexible metallic conduit permitted for use as fixture whips is ____.a. 3/8 inch (10 mm)b. 1/2 inch (13 mm)c. 5/8 inch (16 mm)d. 3/4 inch (19 mm)


96. Lighting fixtures marked "Recessed Fluorescent Fixture" ____ permitted to be installed in a suspended ceiling.a. areb. are not


97. The advantage(s) of pull-chain switches for luminaires (fixtures) include ____.a. local control of task lightingb. energy conservationc. safer than wall switchesd. both a and b


98. The branch circuit feeding the required laundry receptacle ____ permitted to supply other dedicated equipment in the laundry room, including lighting and an exhaust fan.a. is

b. is not


99. Raceways ____ required to be completely installed between boxes before pulling in the wires.a. areb. are not


100. Metallic raceways and metallic cable installations ____ generally considered to be adequate equipment grounding conductors.a. areb. are not


101. Switch and outlet boxes are available with all the following size knockouts, except for ____.a. Trade size 3/8b. Trade size 1/2c. Trade size 3/4d. Trade size 1


102. What size EMT is required for three 6 AWG-THW conductors and two 8 AWG-THW conductors?a. Trade size 1/2b. Trade size 3/4c. Trade size 1d. Trade size 1 1/4


103. A raceway with two, 3-wire branch circuits consisting of four ungrounded conductors and two grounded neutral conductors. The ampacity of these conductors must be based on ____ percent of the ampacity values as found in Table 310.16.a. 80

b. 70c. 60


104. Where the values of branch circuit protection required for motors according to Table 430.52 do not correspond to standard ratings as listed in NEC® 240.6, the next ____ rating is permitted to be used.a. higherb. lowerc. fused. none of these


105. Motor-circuit conductors are sized at 125% of the motor’s nameplate ampere rating, in conformance to ____.a. Table 310-16b. Table 310-19c. NEC® 430-6(A)(1) and 430.22.d. Chapter 9, Table 8


106. When direct-burial Type UF or USE cables are installed beneath sidewalks or other paved areas in residential occupancies, they are required to be ____.a. installed in racewaysb. connected to pole lighting standard grounding lugsc. installed a minimum of 18 in. (450 mm) deepd. both a and c


107. Motor disconnects are required to be ____.a. universal (weatherproof) typeb. dual-voltagec. horsepower-ratedd. listed as motor controllers


108. Underground circuits or feeders from a residence to other structures, such as a garage or shed, or to outdoor electrical equipment, such as pole-mounted lighting or a well pump, are permitted to be ____.a. Type UF cableb. Type USE cablec. Type THHN conductors in racewayd. both a and be. all of the above


109. "Submersible pump cable" supplied with well pump assemblies ____ suitable for directly burial when marked Type USE or Type UF.a. isb. is not


110. If an electric water heater is located within sight of the panelboard that supplies it, a disconnect that opens all ungrounded conductors ____ required.a. isb. is not


111. The Code provides a number of different options for sizing overcurrent protective devices (fuses or circuit-breakers) for motor loads. In all cases, the branch circuit conductors must be sized according to ____.a. the equipment nameplate recommendationsb. the applicable requirements found in Article 430 and/or Article 422c. the connected loadd. either a or b


112. Since the grounded (neutral) conductor is not permitted to be used for grounding the frames of electric ranges, ovens, or cooktops in new installations, these appliances require ____ power cords.a. three-wireb. double-insulated

c. four-wired. Listed


113. Receptacles rated 30 amperes are referred to as ____, and receptacles rated 50 amperes are called ____.a. NEMA 30, NEMA 50b. twist-lock, lockingc. dryer, ranged. none of these


114. NEC® 422.60(A) requires that an appliance nameplate show ____.a. the appliance rating in volts and amperesb. the appliance connected load in volts and wattsc. the appliance branch circuit conductor sized. either a or b


115. When an appliance is not marked with its maximum overcurrent protection, the branch circuit protection device is sized according to ____.a. Table 220-19b. the ampacity of the branch circuit conductors supplying the

appliancec. 30 amperes maximumd. none of these


116. Which of the following are acceptable disconnecting means for appliances?a. a circuit-breaker in sight of the applianceb. a circuit-breaker or switch capable of being locked in the off

positionc. an attachment cord and plugd. all of the above


117. A "unit switch" used as a disconnecting means for an appliance shall ____.a. be horsepower-ratedb. interrupt all ungrounded circuit conductorsc. have a NEMA 3R enclosure when installed outdoorsd. both a and b


118. On all types and ratings of receptacles, the grounding blade is ____ than the others to insure that it makes its connection before the grounded conductors do and breaks its connection after they do (first make-last break).a. largerb. more durablec. longerd. tarnish-resistant


119. When a food-waste disposer has an integral ON-OFF switch, an additional separately installed switch ____ required.a. isb. is not


120. Thermostats and humidistats used in residential occupancies come in ____ models.a. line-voltageb. low-voltagec. solid-stated. all of these


121. The total load of an air conditioner shall not exceed ____ percent of the rating of a separate branch circuit.a. 50b. 75c. 80d. 125


122. The total load of an air conditioner shall not exceed ____ percent of the rating of a branch circuit that also supplies lighting.a. 50b. 75c. 80d. 125


123. When a central air-conditioning unit label states "Maximum size time-delay fuse 50 amperes," what type of circuit-breaker is permitted to provide running overload protection?a. 50-ampere circuit-breakerb. 50-ampere HACR circuit-breakerc. 65-ampere circuit-breakerd. circuit-breakers are not permitted for this application


124. Baseboard heating units can be controlled by ____.a. line-voltage thermostatsb. low-voltage thermostatsc. on-off switchesd. both a and b


125. On circuits supplying cord-and-plug connected air conditioners, the branch circuit overcurrent protective device rating is not permitted to exceed ____.a. the ampacity of the branch circuit conductorsb. the rating of the receptacle to which the air conditioner is connectedc. 50 percent of the total load of the air conditioner plus other loads on

the same circuitd. either a or b, whichever is greater


126. The Article that covers cord-and-plug connected air conditioners is ____.a. Article 210

b. Article 422c. Article 430d. Article 440


127. An outdoor air-conditioning unit is installed along side of a residence. Which of the following choices is correct?a. Mount the required disconnect on the side of the air-conditioning

unit.b. Mount the disconnect on the outside wall of the residence, insight of

the air-conditioning unit, to either side of the unit so as to be readily accessible.

c. Mount the disconnect on the wall of the residence behind the air-conditioning unit.


128. Disconnect switches for furnaces installed in basements are required to be ____.a. suitable for damp locationsb. installed within sight of the appliancec. fusedd. all of these


129. NEC® 422.12 requires that central heating equipment of any type (electric resistance, gas, oil, heat pump) must ____.a. have a disconnect mounted within sight of the unitb. be supplied by a separate branch circuitc. have a supplemental power sourced. both b and c


130. Motor-control circuit conductors must have overcurrent protection in accordance with ____.a. NEC® 240-1b. NEC® 430-72c. NEC® 440-18(d)d. Article 725


131. Internal control circuitry of motorized equipment, such as heating, ventilating, and air-conditioning, is generally covered by ____.a. Article 430b. Article 440c. listing agency standards such as Underwriters’ Laboratoriesd. none of these


132. External control circuitry of motorized equipment such as heating, ventilating, and air-conditioning is generally covered by ____.a. Article 430b. Article 440c. Article 725d. both a and c


133. Class 2 and Class 3 power source voltage limitations, current limitations, and overcurrent protection requirements are found in ____.a. Article 220b. Article 240c. Article 725d. Chapter 9, Tables 11(A), 11(B)


134. Class 2 conductors insulated for 32 volts and power conductors insulated for 600 volts ____ permitted to be installed in the same raceway when they serve the same piece of equipment.a. areb. are not


135. The type of cable most often used for television signal distribution in new residences is ____.a. 300-ohm twin-lead

b. 150-ohm unshielded twisted-pairc. 75-ohm coaxiald. Type FLP


136. When 120-volt receptacles and TV outlets are mounted in double-gang boxes, ____ is required in the box to isolate the TV conductors from the power wiring.a. a metal EMI shieldb. a barrierc. double-groundingd. double-insulation


137. Which of the following rules apply to coaxial cable installations under Article 820?a. The outer shield of the coaxial cable must be grounded close to its

point of entry into the building.b. Coaxial cables shall not be installed in the same raceways or

enclosures as electric light and power conductors.c. Coaxial cables are not permitted to be fastened to raceways that

contain electric light and power conductors.d. all of these.


138. Television antenna and lead-in wires are covered under Article ____.a. 240b. 810c. 820


139. Grounding requirements for residential TV services must conform to the requirements of Article(s)____.a. 250b. 810c. 820d. all of these


140. Transformers and low-voltage wiring for doorbells and chimes are classified as ____ circuits under Article 725.a. Class 1b. Class 2c. Class 3d. Power-limited


141. It ____ permitted to install Class 2 wiring in the same raceway or enclosure as electric light and power wiring.a. isb. is not


142. Signaling circuit is defined in ____.a. Article 100b. NEC® 725.1c. NEC® 725.10(C)d. NEC® 800.3(B)(2)


143. All of the following types of cables may be used for fire protective signaling systems, except for ____.a. Type PLFAb. Type FPLRc. Type CMPd. Type NPLFP


144. Which of the following types of conduit is (are) permitted to be used for service masts?a. rigid nonmetallic conduitb. intermediate metal conduitc. rigid metal conduitd. both b and c


145. A mast service is installed on a residence. The minimum clearance above the roof for the service conductors is ____ provided the conductors pass over not more than 4 ft (1.2 m) of the overhanging portion of the roof.a. 18 in. (450 mm)b. 24 in. (600 mm)c. 36 in. 900 mm)


146. The main service disconnect handle (fused pullout or main breaker) shall not be positioned higher than ____ above the floor.a. 6 ft (1.8 m)b. 6 ft 7 in. (2.0 m)c. 7 ft (2.1 m)


147. GFCI protection for personnel ____ protect a person against the sensation of feeling a shock.a. doesb. does not


148. In general, equipment grounding conductors for swimming pool luminaires (fixtures) can be either solid or stranded, insulated or bare; but, some applications have particular requirements. Give the Code Section that requires swimming pool grounding conductors to be copper, and insulated in order to protect them from corrosion.a. Article 100b. NEC® 250.36(B)c. NEC® 310.1d. NEC® 680.23(F)(2)


149. NEC® 680.2 describes a "permanently installed…pool" as ____.a. one constructed in or partially in the ground

b. a pool with a water depth greater than 42 in. (1.0 meters)c. any pool inside of a buildingd. all of these


150. Transfer switches used for a residential standby power system are ____.a. DPDTb. DPSTc. 1PDT


NATE_TEST

Documents

Transcript of NATE_TEST