Electrical Engineering MCQs

Page No. 72

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


aDeflecting device


bControlling device


cDamping device


dAll of the above


View Answer All of the above

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


aShunts


bMultipliers


cPotential transformers


dAll of the above


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


bcontrolling


cdamping


d any of the above


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


b Indicating instruments


cRecording instruments


dIntegrating instruments



According to application, instruments are classified as_____________?


aswitch board


bportable


cboth A. and B.


dmoving coil


View Answer both A. and B.

Which of the following properties a damping oil must possess ?


aMust be a good insulator


b Should be non-evaporating


cShould not have corrosive action upon the metal of the vane


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


b0.67 V/µs


c 1.5 V/µs


dnone of these


View Answer 0.67 V/µs

Negative feedback_______________?


a increases the input and output impedances


b increases the input impedance and bandwidth


c decreases the output impedance and bandwidth


d does not affect impedance or bandwidth



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


ar’e


br’e/2


c 2r’e


dRE


View Answer 2r’e

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


a r’e


b 2r’e


c r’e/2


d2RE


View Answer 2RE

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