Electrical Engineering MCQs

Page No. 75

A voltage follower _____________?


ahas a voltage gain of 1

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b is noninverting

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chas no feedback resistor

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dhas all of these

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View Answer has all of these

The input offset current equals the_____________?


adifference between two base currents

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baverage of two base currents

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ccollector current divided by current gain

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d none of these

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The tail current in a differential amplifier equals ______________?


a difference between two emitter currents

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bsum of two emitter currents

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ccollector current divided by current gain

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dcollector voltage divided by collector resistance

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A common-mode signal is applied to ________________?


athe noninverting input

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b the inverting input

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c both iputs

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dtop of the tail resistor

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View Answer both iputs

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


adifferential amplifier

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b class B push-pull amplifier

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cCE amplifier

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dswamped amplifier

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Current cannot flow to ground through _______________?


a a mechanical ground

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b an a.c. ground

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ca virtual ground

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d an ordinary ground

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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

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b(n-1)G

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cG/(n-1)

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dG/n

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View Answer G/(n-1)

A CRO is used to measure _________________?


aVoltage

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b Frequency

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c Phase

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dAll of above

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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

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bG/n

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cG/(n-1)

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d(n-1)G

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View Answer (n-1)G

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


aVoltmeter of range 10 V

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bMoving coil galvanometer

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cAmmeter of range 1 A

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dA copper wire of length 1 m and diameter 3 mm

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