Electrical Engineering MCQs

Page No. 352

Between the incoming and outgoing devices in voltage commutation


aLarge overlapping takes place

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b Small overlapping operation

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cNo overlapping operation

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dNone of these

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The average value of the output voltage in a step – down dc chopper is given by__________?


aV 0 = V s

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bV 0 = D V s

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cV 0 = V s / D

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dV 0 = V s / ( 1 – D )

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View Answer V 0 = D V s

Choppers is a_______________?


aAC – DC converters

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bAC – AC converters

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cDC – AC converters

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dDC – DC converters

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View Answer DC – DC converters

In radiative coupling, the emitter radiation field_____________?


a Decays as 1 / R, where R is the separation distance between the emitter and the receptor

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bDecays as R, where R is the separation distance between the emitter and the receptor

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cDecays as 1 / 2 R, where R is the separation distance between the emitter and the receptor

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d Decays as 2R, where R is the separation distance between the emitter and the receptor

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In BJT, switching losses occurs___________?


aOnly at turn – on

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bOnly at turn – off

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cBoth at turn on and off

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dNone of these

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In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes_______?


a Do not contribute to the collector current

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bResult in net current flow component into the base

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cContribute to the collector current

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dOnly (a) and (b)

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View Answer Only (a) and (b)

In EMC signal, the source delivers maximum power to the input of transmission line when the transmission line input impedance


a Is equal to the source resistance

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bGreater than the source resistance

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cSmaller than the source resistance

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dNone of these

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As the breakdown voltage reached, the DIAC exhibits?


aNegative resistance characteristics

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bGoes into avalanche condition

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cVoltage drop snaps back

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dAll of these

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View Answer All of these

For swept frequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length of the transmission line would


aDecrease with frequency

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bRemains same with change in frequency

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cIncrease with frequency

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d Either A. or B.

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DIAC are specifically designed to trigger______________?


aTRIAC

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bSCR

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cGTO

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d Only (a) and (b)

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View Answer Only (a) and (b)

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