Electrical Engineering MCQs

Page No. 123

In a CB amplifier the maximum efficiency could be____________?


a99%


b85%


c50%


d25%


View Answer 25%

Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?


aOnly the temperature


bonly the β of the transistor


cBoth Temperature & β


dNone of the above


View Answer Both Temperature & β

The most commonly used amplifier in sample & hold circuits is______________?


aA unity gain non-inverting amplifier


b A unity gain inverting amplifier


cAn inverting amplifier with a gain of 10


dAn inverting amplifiers with a gain of 100



In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?


aVdc = Vm/π, PIV=2Vm


b Vdc = 2Vm/π, PIV=2vm


cVdc = 2Vm/π, PIV=Vm


dVdc = Vm/π, PIV=Vm



The action of JFET in its equivalent circuit can best be represented as a_____________?


aCurrent controlled Current source


bCurrent controlled voltage source


c Voltage controlled voltage source


dvoltage controlled current source



Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?


a Internal Capacitance of the device


bCoupling capacitor at the input


cSkin effect


d Coupling capacitor at the output



The current gain of a bipolar transistor drops at high frequencies because of____________?


aTransistor capacitances


bHigh current effects in the base


cParasitic inductive elements


d The early effect



Negative feedback in an amplifier____________?


a Reduces gain


bIncrease frequency &phase distortion


cReduces bandwidth


dIncreases noise


View Answer Reduces gain

Class AB operation is often used in power large signal amplifiers in order to_________?


aget maximum efficiency


b remove even harmonics


covercome a crossover distortion


d reducing collector dissipation



An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?


a0.25


b0.5


c0.75


d1


View Answer 0.5

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