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analog electronics MCQs

Practise focused analog electronics questions with marked answers for exam preparation and subject revision.

analog electronics Mcqs

1. In a CB amplifier the maximum efficiency could be____________?
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A. 99%

B. 25%

C. 50%

D. 85%

2. In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at_____________?
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A. the edge of the depletion region on the p-side

B. the center of the depletion region on the n-side

C. the p-n junction

D. the edge of the depletion region on the n-side

3. The most commonly used amplifier in sample & hold circuits is______________?
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A. A unity gain non-inverting amplifier

B. An inverting amplifiers with a gain of 100

C. A unity gain inverting amplifier

D. An inverting amplifier with a gain of 10

4. A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?
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A. 25 ? & 20 %

B. 5 ? & 20 %

C. 25 ? & 16.7 %

D. 5 ? & 16.7 %

5. An amplifier without feedback has a voltage gain of 50,input resistance os 1 K? & Output resistance of 2.5K?.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
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A. 1/11K?

B. 11K?

C. 1/5K?

D. 5K?

6. The effective channel length of a MOSFET in a saturation decreases with increase in___________?
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A. Source voltage

B. Body voltage

C. Gate voltage

D. Drain voltage

7. In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?
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A. Vdc = 2Vm/?, PIV=2vm

B. Vdc = 2Vm/?, PIV=Vm

C. Vdc = Vm/?, PIV=Vm

D. Vdc = Vm/?, PIV=2Vm

8. Voltage Series feedback also called series-shunt feedback) results in__________?
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A. Increase in both input & output impedances

B. Decreases in both input & output impedances

C. Increase in input impedance & decreases in output impedance

D. Decrease in input impedance & increase in output impedance

9. The current gain of a bipolar transistor drops at high frequencies because of____________?
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A. High current effects in the base

B. The early effect

C. Transistor capacitances

D. Parasitic inductive elements

10. Which of the following amplifier circuit using junction transistor has the best gain?
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A. Common base

B. Common collector

C. All have the same gain

D. Common emitter

11. A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?
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A. 2-Jan

B. 1

C. 2

D. 0

12. A source follower using an FET usually has a voltage gain which is___________?
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A. greater than +100

B. about -10

C. slightly less than unity but positive

D. exactly unity but negative

13. The cascade amplifier is a multistage configuration of__________?
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A. CE-CB

B. CB-CC

C. CE-CC

D. CC-CB .

14. In an op-amp differentiator:________________?
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A. the amplitude of output is proportional to rate of change of input

B. polarity of input and output is the same

C. output occurs when input is finite and constant

D. the amplitude of output is proportional to input

15. A change in the value of the emitter resistance Re in a differential amplifier?
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A. affects the difference mode gain Ad

B. affects the common mode gain Ac

C. ffects both Ad and Ac

D. does not effect either Ad and Ac

16. The action of JFET in its equivalent circuit can best be represented as a_____________?
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A. voltage controlled current source

B. Current controlled voltage source

C. Current controlled Current source

D. Voltage controlled voltage source

17. Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?
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A. high input resistance

B. high voltage gain

C. high CMRR

D. input voltage dependent linear transfer characteristic

18. The early effect in a bipolar junction transistor is caused by_______________?
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A. fast turn-off

B. large emitter-base forward bias

C. large collector-base reverse bias

D. fast turn-on

19. The current gain of a BJT is__________?
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A. gm r?

B. gm /r?

C. gm r0

D. gm / r0

20. A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?
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A. Open-loop gain

B. Slew rate

C. CMMR

D. Bandwidth

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