Electrical Engineering MCQs

Page No. 125

To prevent a DC return between source and load, it is necessary to use___________?


aresistor between source and load


b inductor between source and load


ccapacitor between source and load


deither A. or B.



The current gain of a BJT is__________?


a gm r0


bgm / r0


cgm rπ


d gm /rπ


View Answer gm rπ

An ideal OP-AMP is an ideal___________?


aCurrent controlled Current source


bCurrent controlled voltage source


cVoltage controlled voltage source


d voltage controlled current source



An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?


a1/11KΩ


b 1/5KΩ


c5KΩ


d11KΩ


View Answer 1/11KΩ

In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?


a23dB


b25dB


c46dB


d 50dB


View Answer 46dB

The parameter hie stands for input impedance in _____________?


aCB arrangement with output shorted


bCC arrangement with output shorted


cCE arrangement with output shorted


dNone of the above



The values of h parameter of a transistor in CE arrangement are ____________ arrangement?


aThe same as for CB


bThe same as for CC


c Different from that in CB


dNone of the above



The hfe parameter is called ______________in CE arrangement with output shorted?


aVoltage gain


bCurrent gain


cInput impedance


dNone of the above


View Answer Current gain

If temperature changes, h parameters of a transistor ________________?


aMay or may not change


bDo not change


cAlso change


dNone of the above


View Answer Also change

If the operating point changes, the h parameters of transistor_____________?


aAlso change


bDo not change


cMay or may not change


d None of the above


View Answer Also change

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