1. ELECTRONIC CIRCUITS-I
TECHNICAL QUIZ-I
PREPARED BY
G.JAYANTHI
AP/ECE

2. 1. What is the output voltage, if a transistor amplifier has a voltage gain of 100 and input voltage is 75 mV?
A V
B. 7.5 V
C V
D. 15 V

3. 2. What is the ratio of IC to IB. A. βDC B. hFE C. αDC D
2.What is the ratio of IC to IB? A. βDC B. hFE C.αDC D. either β DC or hFE, but not α DC

4. 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, negative
B. positive, positive
C. negative, positive
D. negative, negative

5. 4.When a transistor is used as a switch, it is stable in which two distinct regions? A.saturation and active B.active and cutoff C.saturation and cutoff D.none of the above

6. 5. What is the abbreviation for BJT. A. base junction transistor. B
5. What is the abbreviation for BJT ? A. base junction transistor. B. binary junction transistor. C. both junction transistor. D. bipolar junction transistor.

7. 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.

8. 7.Which BJT amplifier has similar in configuration of common-gate amplifier ? A. common-emitter B. common-collector C. common-base D. emitter-follower

9. 8. What is the theoretical efficiency of a class D amplifier ? A.75%. B.85%. C.90%. D.100%.

10. 9.Which BJT amplifier has similar in configuration of common-source amplifier ? A. common-base B. common-collector C. common-emitter D. emitter-follower

11. 10. Which type of controlled device is BJT? A. current B. voltage

12. A. common-emitter B. common-collector C. common-base D. common-gate
11.Which BJT amplifier has similar in configuration of common-Drain amplifier ?
A. common-emitter
B. common-collector
C. common-base
D. common-gate

13. 12.What is (are) the function(s) of the coupling capacitors C1 and C2 in an FET circuit?
A. To create an open circuit for dc analysis
B. To isolate the dc biasing arrangement from the applied signal and load
C. To create a short-circuit equivalent for ac analysis
D. All of the above

14. 13. Which type of controlled device is FET?
A. current
B. voltage

15. 14.What type of transistors is used for the class D amplifier ?
A. JFETs
B. BJTs
C. MOSFETs
D. Any of the above

16. 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

17. 16.Which transistor bias circuit arrangement provides good stability using negative feedback from collector to base?
A.base bias
B.collector-feedback bias
C.voltage-divider bias
D.emitter bias

18. 17.What is the dc input resistance at the base of a BJT?
A.β DCRC
B. β DC(RC||RE )
C. β DC·re′
D. β DCRE

19. 18.Which transistor bias circuit provides good Q-point stability with a single-polarity supply voltage?
A. Base bias
B. Collector-feedback bias
C. Voltage-divider bias
D. Emitter bias

20. 19.Where the Q point is placed to bias the transistor for linear operation?
A. Near saturation.
B. Near cutoff.
C. Where IC is maximum.
D. Halfway between cutoff and saturation.

21. 20.Which is the most stable biasing technique? A. voltage-divider bias. B. base bias. C. emitter bias. D. collector bias.

22. 21. What is the current gain for the Darlington connection?
B. β1. β2
C. β1\ β2
D. β1.(β2-1)

23. 22.Which of the following configurations has the lowest output impedance?
A. Fixed-bias
B. Voltage-divider
C. Emitter-follower
D. None of the above

24. 23.Which of the h-parameters corresponds to re in a common-base configuration?
A. hib
B. hfb
C. hrb
D. hob

25. 24. Which of the following is referred to as the reverse transfer voltage ratio? A. hi B. hr C. hf D. ho

26. 25. What is other name for the emitter-follower. A
25.What is other name for the emitter-follower? A.common-emitter amplifier. B.common-base amplifier. C.common-collector amplifier. D.Darlington pair.

27. 26.Which model fails to account for he output impedance level of the device and the feedback effect from output to input?.
A. Hybrid equivalent
B. re
C. β
D. Thevenin

28. 27.Which of the following would you choose to apply an amplifier with a very high power gain?
A. Common-collector
B. Common-base
C. Common-emitter
D. Emitter-follower

29. 28. What is the voltage gain of a feedback pair connection?

30. 29.What is the voltage gain, current gain, power gain, and input impedance for common-emitter amplifier?
A. High, low, high, low
B. High, high, high, low
C. High, high, high, high
D. Low, low, low, high

31. 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

32. 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

33. 32.What is the unit of the parameter ho
A. Volt
B. Ohm
C. Siemen
D. No unit

34. 33. What is the range of the current gain for BJT transistor amplifiers? A. Less than 1 B. 1 to 100 C. 100 D. All of the above

35. 34. What does the negative sign in the voltage gain of the common-emitter fixed-bias configuration indicate?
A. The output and input voltages are 180º out of phase.
B. Gain is smaller than 1.
C. Gain is larger than 1.
D. None of the above

36. 35.Which one of the following configurations has the lowest input impedance?
A. Fixed-bias
B. Common-base
C. Emitter-follower
D. Voltage-divider

37. 36.What is the approximate current level in the gate of an FET in dc analysis?
A. 0 A
B. 0.7 mA
C. 0.3 mA
D. Undefined

38. 37. What are the terminals of differential amplifier. A
37. 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.

39. 38.What is the input impedance and output impedance for the emitter-follower Configuration?
A. Low, low
B. Low, high
C. High, low
D. High, high

40. 39. What is the output of differential amplifier. A. Common mode. B
39.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.

41. 40. Which model suffers from being limited to a particular set of operating conditions? if it is to be considered accurate.
A. hybrid equivalent
B. re
C. β
D. Thevenin

42. 41.What is the input signal for common-base amplifier?
A. Base.
B. Collector.
C. Emitter.
D. Output.

43. 42.What must be done to determine the dc equivalent circuit to analyze the common-emitter amplifier A. Leave circuit unchanged B. Replace coupling and bypass capacitors with opens C. Replace coupling and bypass capacitors with shorts D. Replace VCC with ground

44. 43.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.

45. 43.Which of the following gains is less than 1 for a common-base configuration?
A. Ai
B. Av
C. Ap
D. None of the above

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

47. 46.Which term hie replaces hie  in the re model in an unbypassed emitter bias configuration?
A.re
B.β
C.βre
D.Ib

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

49. 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.

50. A. N2/N1 B. (N1/N2)2 C. (N1/N2)1/3 D. N1 × N2
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 × N2

51. 50.Which type of power amplifier is biased for operation at less than 180º of the cycle?
a). Class A
b). Class B or AB
c). Class C
d).Class D