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

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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

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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

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d Coupling capacitor at the output

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


aTransistor capacitances

✓


bHigh current effects in the base

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cParasitic inductive elements

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d The early effect

✖



Negative feedback in an amplifier____________?


a Reduces gain

✓


bIncrease frequency &phase distortion

✖


cReduces bandwidth

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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

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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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