Electrical Engineering MCQs

Page No. 75

A voltage follower _____________?


ahas a voltage gain of 1


b is noninverting


chas no feedback resistor


dhas all of these


View Answer has all of these

The input offset current equals the_____________?


adifference between two base currents


baverage of two base currents


ccollector current divided by current gain


d none of these



The tail current in a differential amplifier equals ______________?


a difference between two emitter currents


bsum of two emitter currents


ccollector current divided by current gain


dcollector voltage divided by collector resistance



A common-mode signal is applied to ________________?


athe noninverting input


b the inverting input


c both iputs


dtop of the tail resistor


View Answer both iputs

The input stage of an Op-amp is usually a ________________?


adifferential amplifier


b class B push-pull amplifier


cCE amplifier


dswamped amplifier



Current cannot flow to ground through _______________?


a a mechanical ground


b an a.c. ground


ca virtual ground


d an ordinary ground


View Answer a virtual ground

An ammeter has a resistance of G ohms and range of I amperes. The value of resistance required in parallel to convert it into an ammeter of range nI is______________?


a nG


b(n-1)G


cG/(n-1)


dG/n


View Answer G/(n-1)

A CRO is used to measure _________________?


aVoltage


b Frequency


c Phase


dAll of above


View Answer All of above

A voltmeter has a resistance of G ohms and range V volts. The value of resistance required in series to convert it into voltmeter of range nV is________________?


a nG


bG/n


cG/(n-1)


d(n-1)G


View Answer (n-1)G

Which of the following is likely to have the largest resistance ?


aVoltmeter of range 10 V


bMoving coil galvanometer


cAmmeter of range 1 A


dA copper wire of length 1 m and diameter 3 mm



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