ELECTRONIC CIRCUITS-I

ELECTRONIC CIRCUITS-ITECHNICAL QUIZ-I

PREPARED BYG.JAYANTHIAP/ECE1. What is the output voltage, if a transistor amplifier has a voltage gain of 100 and input voltage is 75 mV?

A. 1.33 VB. 7.5 VC. 13.3 VD. 15 V

2.What is the ratio of ICto IB?A. DCB. hFEC.DCD. either DCor hFE, but not DC

3. How the base is connected with respect to the emitter and with respect to the collector for normal operation of a pnp BJT?

A. positive, negativeB. positive, positiveC. negative, positiveD. negative, negative

4.When a transistor is used as a switch, it is stable in which two distinct regions?

A.saturation and activeB.active and cutoffC.saturation and cutoffD.none of the above5. What is the abbreviation for BJT ?A. base junction transistor.B. binary junction transistor.C. both junction transistor.D. bipolar junction transistor.6. When a base-emitter junction is forward-biased, what is the nominal voltage drop of silicon transistor?

A. 0.7 V.B. 0.3 V.C. 0.2 V.D. VCC.7.Which BJT amplifier has similar in configuration of common-gate amplifier ?A. common-emitterB. common-collectorC. common-baseD. emitter-follower8. What is thetheoreticalefficiency of a class D amplifier ?A.75%.B.85%.C.90%.D.100%.9.Which BJT amplifier has similar in configuration of common-source amplifier ?A. common-baseB. common-collectorC. common-emitterD. emitter-follower10. Which type of controlled device is BJT?A. currentB. voltage 11.Which BJT amplifier has similar in configuration of common-Drain amplifier ?

A. common-emitterB. common-collectorC. common-baseD. common-gate

12.What is (are) the function(s) of the coupling capacitors C1and C2in an FET circuit?

A. To create an open circuit for dc analysisB. To isolate the dc biasing arrangement from the applied signal and loadC. To create a short-circuit equivalent for ac analysisD. All of the above

13. Which type of controlled device is FET?

A. currentB. voltage

14.What type of transistors is used for the class D amplifier ?

A. JFETsB. BJTsC. MOSFETsD. Any of the above

15. What is the result of Clipping? A. The input signal being too large.B. The transistor being driven into saturation.C. Transistor being driven into cutoff.D. All of the above

16.Which transistor bias circuit arrangement provides good stability using negative feedback from collector to base?

A.base biasB.collector-feedback biasC.voltage-divider biasD.emitter bias

17.What is the dc input resistance at the base of a BJT?A. DCRCB. DC(RC||RE )C. DCreD. DCRE

18.Which transistor bias circuit provides good Q-point stability with a single-polarity supply voltage?

A. Base biasB. Collector-feedback biasC. Voltage-divider biasD. Emitter bias

19.Where the Q point is placed to bias the transistor for linear operation?

A. Near saturation.B. Near cutoff.C. Where ICis maximum.D. Halfway between cutoff and saturation.

20.Which is the most stable biasing technique?

A. voltage-divider bias.B. base bias.C. emitter bias.D. collector bias. 21. What is the current gain for the Darlington connection?

A. 1.(2\2)B. 1. 2C. 1\ 2D. 1.(2-1)22.Which of the following configurations has the lowest output impedance?A. Fixed-biasB. Voltage-dividerC. Emitter-followerD. None of the above

23.Which of the h-parameters corresponds to rein a common-base configuration?A. hibB. hfbC. hrbD. hob

24. Which of the following is referred to as the reverse transfer voltage ratio?A. hiB. hrC. hfD. ho25.What is other name for the emitter-follower?A.common-emitter amplifier.B.common-base amplifier.C.common-collector amplifier.D.Darlington pair.26.Which model fails to account for he output impedance level of the device and the feedback effect from output to input?.A. Hybrid equivalentB. reC. D. Thevenin

27.Which of the following would you choose to apply an amplifier with a very high power gain?

A. Common-collectorB. Common-baseC. Common-emitterD. Emitter-follower

28. What is the voltage gain of a feedback pair connection?A.1B.1C.100D.100

29.What is the voltage gain, current gain, power gain, and input impedance for common-emitter amplifier?A. High, low, high, lowB. High, high, high, lowC. High, high, high, highD. Low, low, low, high

30. What is the range of the input impedance of a common-base configuration?A. A few ohms to a maximum of 50 B. 1 k to 5 k C. 100 k to 500 k D. 1 M to 2 M

31. What is the typical range of the output impedance of a common-emitter configuration?A.10 to 100 B.1 k to 5 k C.40 k to 50 k D.500 k to 1 k 32.What is the unit of the parameter hoA. VoltB. OhmC. SiemenD. No unit

33. What is the range of the current gain for BJT transistor amplifiers?A. Less than 1B. 1 to 100C. 100D. All of the above34. What does the negative sign in the voltage gain of the common-emitter fixed-bias configuration indicate?A. The output and input voltages are 180 out of phase.B. Gain is smaller than 1.C. Gain is larger than 1.D. None of the above

35.Which one of the following configurations has the lowest input impedance?A. Fixed-biasB. Common-baseC. Emitter-followerD. Voltage-divider

36.What is the approximate current level in the gate of an FET in dc analysis?A. 0 AB. 0.7 mAC. 0.3 mAD. Undefined37. What are the terminals of differential amplifier?

A. One input and one output.B. Two inputs and two outputs.C. Two inputs and one output.D. One input and two outputs.38.What is the input impedance and output impedance for the emitter-follower Configuration? A. Low, lowB. Low, highC. High, lowD. High, high39.What is the output of differential amplifier?A. Common mode.B. In-phase with the input voltages.C. The sum of the two input voltages.D. The difference of the two input voltages.40. Which model suffers from being limited to a particular set of operating conditions? if it is to be considered accurate.

A. hybrid equivalentB. reC. D. Thevenin41.What is the input signal for common-base amplifier?

A. Base.B. Collector.C. Emitter.D. Output.

42.What must be done to determine the dc equivalent circuit to analyze the common-emitter amplifierA. Leave circuit unchangedB. Replace coupling and bypass capacitors with opensC. Replace coupling and bypass capacitors with shortsD. Replace VCCwith ground43.What happen to all capacitors in common-emitter amplifier ac equivalent circuit?

A. Effectively shorts.B. Effectively open circuits.C. Not connected to ground.D. Connected to ground.

43.Which of the following gains is less than 1 for a common-base configuration?A. AiB. AvC. ApD. None of the above

45. Which of the following should be done to obtain the ac equivalent of a network?A. Set all dc sources to zeroB. Replace all capacitors by a short-circuit equivalent.C. Remove all elements bypassed by the short-circuit equivalent.D. All of the above

46.Which term hiereplaces hie in the remodel in an unbypassed emitter bias configuration?A.reB.C.reD.Ib

47.What is the total gain of a multistage amplifier?A.sum of individual voltage gainsB.sum of dB voltage gains

48. What is the ripple factor of a full-wave rectifier circuit compared to that of a half wave rectifier circuit without filter?

(A) half of that for a half 'wave rectifier (B) less than half that for a half-wave rectifier circuit (C) equal to that of a half wave rectifier. (D) none of the above.

49. What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the windings? A. N2/N1 B. (N1/N2)2 C. (N1/N2)1/3 D. N1 N250.Which type of power amplifier is biased for operation at less than 180 of the cycle?a). Class A b). Class B or AB c). Class C d).Class D