Electrical Engineering MCQs

Page No. 111

When an SCR is turned on, the voltage across it is about _____________?


aZero


b 10 V


c1 V


d1 V


View Answer 1 V

An SCR is a ____________ triggered device?


aVoltage


bCurrent


cVoltage as well as current


dNone of the above


View Answer Current

An SCR is made of silicon and not germanium because silicon _________________?


aIs inexpensive


bIs mechanically strong


cHas small leakage current


d Is tetravalent



In an SCR circuit the supply voltage is generally ___________ that of breakover voltage?


aEqual to


bLess than


cGreater than


dNone of the above


View Answer Less than

The normal way to turn on a SCR is by______________?


aBreakover voltage


bAppropriate anode current


cAppropriate gate current


dNone of the above



An SCR combines the features of ____________?


aA rectifier and resistance


bA rectifier and transistor


cA rectifier and capacitor


dNone of the above



An SCR is turned off by _________________?


aReducing anode voltage to zero


bReducing gate voltage to zero


cReverse biasing the gate


dNone of the above



The control element of an SCR is ______________?


aCathode


b Anode


cAnode supply


dGate


View Answer Gate

In the normal operation of an SCR, anode is __________ w.r.t. cathode?


aAt zero potential


bNegative


c Positive


dNone of the above


View Answer Positive

An SCR behaves as a____________switch?


a Unidirectional


bBidirectional


c Mechanical


dNone of the above


View Answer Unidirectional

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