Electrical Engineering MCQs

Page No. 122

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_________?


a49dB

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b51dB

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c 98dB

✓


d102dB

✖


View Answer 98dB

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________?


a795mV

✖


b 395mV

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c795 mV

✓


d 39.5mV

✖


View Answer 795 mV

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________?


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

✖


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

✓


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

✖


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

✖



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


aresistor

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b inductor

✖


ccapacitor

✓


dbattery

✖


View Answer capacitor

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


a2.3mA

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b3.2mA

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c4.6 mA

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d5.2mA

✓


View Answer 5.2mA

In a common emitter, unbypassed resister provides___________?


avoltage shunt feedback

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b current series feedback

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cnegative voltage feedback

✓


dpositive current feedback

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


a2

✓


b1

✖


c1/2

✖


d0

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View Answer 2

MOSFET can be used as a__________?


acurrent controlled capacitor

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bvoltage controlled capacitor

✓


ccurrent controlled inductor

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dvoltage controlled inductors

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


aCommon base

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bCommon emitter

✓


c Common collector

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dAll have the same gain

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View Answer Common emitter

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


a cut off point

✓


bsaturation point

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coperating point

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dquasi saturation point

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View Answer cut off point

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