Oil Heating

Oil Heating

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

1. A cylinder with 1,500 sq. in. of internal surface contains R-22 and is in a service truck body at 120°F. What is the total outward force of the refrigerant against the inner wall of the cylinder in tons of pressure?a. 202.64b. 226.61c. 194.92d. 145.71

ANSWER: CPOINTS: 0 / 1FEEDBACK:

2. An R-22 cylinder containing enough refrigerant to have liquid refrigerant in it, is in a truck with a temperature of 120°F. What would be the psig pressure in the cylinder?a. 255.7 psigb. 259.9 psigc. 267.0 psigd. 271.5 psig

ANSWER: BPOINTS: 0 / 1FEEDBACK:

3. In electrical circuits, the grounding wire is typically ____.a. blackb. redc. green or bared. white


4. By design, which of the following air ducts will allow 250 cfm to flow with a velocity of 500 ft/min?a. 9" x 8"b. 16" x 9"c. 10" x 9"

d. none of the above

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5. The pressure in a duct system is measured in:a. psigb. psiac. " Hgd. " WC

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6. An example of a pressure vessel is ____.a. a small ship containing refrigerant cylindersb. the compressor in a refrigeration unitc. a cylinder containing refrigerantd. a portable dolly


7. If the resistance against a propeller fan is doubled, the cfm output decreases, but the amperage draw of the motor ____.a. decreasesb. increasesc. stays the samed. overheats the motor


8. Which of the following statements is correct when referring to large refrigerant or nitrogen tanks?a. The protective cap must be on when the tank is not in use.b. Safety goggles or glasses must be worn when moving the tank.c. Large tanks should not be carried, they should be secured to an

approved cart.d. All of the above are correct.

ANSWER: D

POINTS: 0 / 1FEEDBACK:

9. Before using a voltmeter, always ____.a. Zero the ohms adjustment.b. Touch the two leads together to insure continuity.c. Set the range selector to a setting higher than the voltage you expect

to read.d. Turn off the power.


10. To make combustion efficiency tests, a hole must be made ____.a. in the flue pipe after the draft controlb. in the flue pipe before the draft controlc. over the fire at the observation doord. under the draft hood


11. Measuring velocity pressure in a duct indicates the ____.a. volume of air through a ductb. speed at which the air is movingc. pressure against the sides of the ductd. weight of the air moving through the duct


12. Technician "A" says that if the air filter on an air-conditioning system is totally blocked with dirt, the amperage draw of the evaporator fan motor will go down. Technician "B" says that if you close down one supply register on a duct system, the volume of air feeding the other locations will increase slightly. Which of the following statements is correct?a. Technician "A" is correct. Technician "B" is correct.b. Technician "A" is correct. Technician "B" is incorrect.c. Technician "A" is incorrect. Technician "B" is correct.d. Technician "A" is incorrect. Technician "B" is incorrect.

ANSWER: APOINTS: 0 / 1

FEEDBACK:

13. If the equivalent length of a transition piece of ductwork is 10 feet and the main duct in series with it is 20 feet, what is the length used to estimate the total frictional loss?a. 10 feetb. 30 feetc. 60 feetd. 20 feet


14. If a technician inspects the interior of a combustion chamber and finds large quantities of unburned oil, he would correctly conclude that ____.a. The nozzle may be too small.b. The stack switch may be defective.c. The primary control unit may be defective.d. Both b and c are correct.


15. The fitting at the end of a round duct that connects the duct to the floor register is called a(n) ____.a. end bootb. reducerc. take offd. stack head


16. The grade of fuel used in residential and light commercial units is ____.a. No. 1b. No. 2c. No. 4d. No. 6


17. The number engraved on the nozzle indicates ____.a. how many gallons of air per hour the nozzle will deliver regardless of

input pressureb. how many foot pounds of pressure must be used to properly tighten

the nozzlec. how many gallons of oil per hour the nozzle will deliver at a given

input pressured. the stock number of the part


18. If the resistance against a centrifugal blower is doubled, the cfm output decreases, and the amperage draw of the motor ____.a. decreases slightlyb. increases slightlyc. stays the samed. overheats the motor


19. When using a torch to braze a fitting, the technician should use the proper size ____, wear ____, and always have a ____ nearby.a. copper pipe, insulated boots, fire extinguisherb. torch tip, insulated boots, protective fire shieldc. torch tip, safety glasses, fire extinguisherd. acetylene tank, safety glasses, bucket of water


20. The reason for using a reducing extended plenum system is to ____,a. save metal by using a smaller ductb. reduce the operating cost of the systemc. provide easier means of fastening the take off fittingsd. maintain a more even pressure throughout the entire length of the

trunk duct


21. When transferring refrigerants from a cylinder to a refrigeration system or any other container, you should always wear ____.a. goggles with side shields and glovesb. heavy protective clothingc. rubber glovesd. industrial steel-toed shoes and an insulated cap


22. A fusible plug is a metal fitting that has a hole drilled through it and the hole is filled with ____.a. material with a low melting pointb. plasticc. copper fused with brassd. a metal alloy that will burn when overheated


23. Which of the following is typically measured with an inclined water manometer?a. static pressure in a duct systemb. pressure in a refrigeration systemc. manifold pressure in a gas fired furnaced. nozzle pressure of an oil burner


24. A condensing oil furnace operates at a higher efficiency because part of the heat output is ____.a. sensible heatb. latent heatc. superheatd. sub-cooling


25. The stack switch or stack relay ____.a. starts the fan motor when the thermostat calls for heat

b. shuts down the burner if it does not sense heat in the flue productsc. cuts off the ignition after the flame has been establishedd. all of the above


26. Improper combustion can lead to ____.a. excessive carbon monoxide productionb. smoke condition around furnacec. wasted oild. all of the above


27. When it is necessary to perform electrical work in an area that has a damp or wet floor, which of the following can be done to minimize the chance of electrical shock?a. Place a rubber mat on the floor.b. Use a wooden ladder.c. Wear insulated boots and gloves.d. All of the above


28. A special tool has been designed to help remove and install nozzles from the burner. It is called a nozzle wrench and it ____.a. has an outer wrench that holds the burner in place, while the inner

wrench holds the nozzleb. minimizes the chance of cracking the porcelainc. can only be used on semi-hollow conesd. both a and b


29. A double insulated drill ____.a. has two ground wires to insure proper groundingb. generally has a plastic case with the electrical connections and motor

insulated within the tool

c. is used with a three- to two-prong adapterd. has rechargeable batteries


30. An auxiliary tank and booster pump system is required if the oil supply is ____ below the oil burner pump.a. any distanceb. 5 feet or morec. 10 feet or mored. 15 feet or more


True/FalseIndicate whether the sentence or statement is true or false.

31. Nozzles can be cleaned to remove any carbonization by using a very fine wire brush.

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32. The tangential shots in an oil burner nozzle are to control the volume of oil flow through the nozzle.


33. In a single-stage fuel oil pump, the oil is fed to the burner by capillary action.


34. If you are a refrigeration technician, a warm coat and gloves should be in your truck, even in the middle of the summer.

ANSWER: TPOINTS: 0 / 1FEEDBACK:

35. The free area of most registers and grills is 65% of the total face area.


36. After several seasons, buried oil tanks are very subject to water under the oil.


37. A necessary safety practice for a technician is to keep a padlock with only one key in the tool box.


38. To insure proper operation of an oxygen cylinder regulator, make sure no oil residue is present.


39. The volume of air that an air conditioning system can deliver can be increased by adjusting the belt tension on the blower.


40. The static pressure in a duct is the total pressure less the velocity pressure.


41. When working in a machine room, safety glasses should not be worn because they can fog up and impede your eyesight.


42. Oil burner nozzles are designed and rated at 100 psig nozzle pressure.


43. It is possible that your hand would suffer frostbite if it comes in contact with liquid R-22 when accidentally releasing refrigerant into the atmosphere (an illegal procedure).


44. Aluminum ladders are safe to use around electrical equipment as long as they have insulation pads on the bottom of the rungs.


45. Because the blower in the air handler (furnace) draws the air down the return air duct system, the return air duct is the same size as the supply duct system.


CompletionComplete each sentence or statement.

46. The easiest way to move equipment across a roof is to use ________________________________________.

RESPONSE:ANSWER: rollers and plywood for a basePOINTS: 0 / 1

47. The heat content of one gallon of No. 2 fuel oil is ____________________.

RESPONSE:ANSWER: 140,000 BtuPOINTS: 0 / 1

48. To connect a branch duct to the main duct, a ____________________ fitting is used.

RESPONSE:ANSWER: take offPOINTS: 0 / 1

49. Oil must never be used around an ____________________ cylinder.

RESPONSE:ANSWER: oxygenPOINTS: 0 / 1

50. In a typical air conditioning system, ____________________ cfm of air is moved through the evaporator for each 12,000 Btu/h cooling capacity of the system.

RESPONSE:ANSWER: 400POINTS: 0 / 1

Oil Heating

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