Analog Electronics Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Analog Electronics ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Analog Electronics comprehensively.

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31.
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____________?

Vdc = Vm/π, PIV=2Vm

Vdc = 2Vm/π, PIV=2vm

Vdc = 2Vm/π, PIV=Vm

Vdc = Vm/π, PIV=Vm

32.
The most commonly used amplifier in sample & hold circuits is______________?

A unity gain non-inverting amplifier

A unity gain inverting amplifier

An inverting amplifier with a gain of 10

An inverting amplifiers with a gain of 100

33.
Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?

Only the temperature

Only the β of the transistor

Both Temperature & β

None of the above

35.
The horizontal intercept of dc load line is the same as ideal____________?

Cut off point

Saturation point

Operating point

Quasi saturation point

36.
Which of the following amplifier circuit using junction transistor has the best gain?

Common base

Common emitter

Common collector

All have the same gain

37.
MOSFET can be used as a__________?

Current controlled capacitor

Voltage controlled capacitor

Current controlled inductor

Voltage controlled inductors

38.
A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?

2

1

1/2

39.
In a common emitter, unbypassed resister provides___________?

Voltage shunt feedback

Current series feedback

Negative voltage feedback

Positive current feedback

40.
. If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?

2.3mA

3.2mA

4.6 mA

5.2mA

41.
The MOSFET switch in its on-state may be considered equivalent to_____________?

Resistor

Inductor

Capacitor

Battery

42.
An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?

FT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.

FT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

FT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz

FT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

43.
An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?

795mV

395mV

795 mV

39.5mV

44.
Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?

49dB

51dB

98dB

102dB

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