Electrical Engineering MCQs

Page No. 72

Which of the following essential features is possessed by an indicating instrument?


aDeflecting device

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bControlling device

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cDamping device

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dAll of the above

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View Answer All of the above

Which of the following devices may be used for extending the range of instruments ?


aShunts

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bMultipliers

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cPotential transformers

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dAll of the above

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View Answer All of the above

A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?


a deflecting

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bcontrolling

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cdamping

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d any of the above

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View Answer damping

Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?


a Absolute instruments

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b Indicating instruments

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cRecording instruments

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dIntegrating instruments

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According to application, instruments are classified as_____________?


aswitch board

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bportable

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cboth A. and B.

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dmoving coil

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View Answer both A. and B.

Which of the following properties a damping oil must possess ?


aMust be a good insulator

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b Should be non-evaporating

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cShould not have corrosive action upon the metal of the vane

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dAll of the above

✓


View Answer All of the above

The output of a particular Op-amp increases 8V in 12µs. The slew rate is_______________?


a90 V/µs

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b0.67 V/µs

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c 1.5 V/µs

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dnone of these

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View Answer 0.67 V/µs

Negative feedback_______________?


a increases the input and output impedances

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b increases the input impedance and bandwidth

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c decreases the output impedance and bandwidth

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d does not affect impedance or bandwidth

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The differential voltage gain of a differential amplifier is equal to RC divided by _______________?


ar’e

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br’e/2

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c 2r’e

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dRE

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View Answer 2r’e

The common-mode voltage gain of a differential amplifier is equal to RC divided by _______________?


a r’e

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b 2r’e

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c r’e/2

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d2RE

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View Answer 2RE

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