Electrical Engineering MCQs

Page No. 364

The typical value of SCR for modern alternator is____________?


a1.5.


b0.5.


c1.0.


d1.2.


View Answer 0.5.

An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be_____?


a1500 A.


b6000 A.


c2121.32 A.


d4242.64 A.


View Answer 2121.32 A.

A Triac has three terminals viz ___________?


aDrain, source, gate


bTwo main terminal and a gate terminal


cCathode, anode, gate


dNone of the above



A thyristor is basically________?


aPNPN device


bA combination of diac and triac


cA set of SCRs


dA set if SCR,diac and triac


View Answer PNPN device

A PNPN device having two gates is ___________?


aDiac


bTriac


cSUS


dBCS


View Answer BCS

A silicon controlled racitifier (SCR) is a ____________?


aUnijunction device


bDevice with three junction


cDevice with four junction


dNone of the above



A thyristor equivalent of a thyratron tube is a _________?


aDiac


bTriac


cSilicon controlled-rectifier SCR


dNone of above



A Triac is a ______________?


a2 terminal switch


b2 terminal bilateral switch


c3 terminal bilateral switch


d3 terminal bidirectional switch



Which of the following quantities consists of SI unit as WATT ?


aForce


bCharge


cCurrent


dPower


View Answer Power

Which of the following has no units?


aPermeability


bMoment of a magnet


cMagnetic susceptibility


dPermittivity



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