Electrical Engineering MCQs

Page No. 358

The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is___________?


a130 μs


b135 μs


c140 μs


d145 μs


View Answer 135 μs

Maximum power loss occurs during_________________?


adelay time


brise time


cspread time


dall


View Answer rise time

Spread time is defined as the interval during which_____________?


aanode voltage drops from 10 % of its initial value to zero


banode current rises from 90 % to its final value


cboth (A) and (B)


d anode current rises from 10 % to 90 % of its final value



The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will___________?


aTurn on


bNot turn on


cTurn on if inductance is removed


dTurn on if pulse frequency us increased to two times


View Answer Turn on

A power MOSFET has three terminals called___________?


aCollector, emitter and gate


bDrain, source and gate


cDrain, source and base


dCollector, emitter and base



Rise time is defined by the interval when____________?


agate current rises from 90 % to 100 % of it final value


banode voltage drops from 90 % to 10 % of its initial value


canode current rises 10 % to 90 % of its final value


dboth B and C


View Answer both B and C

A modern power semiconductor device that combines the characteristic of BJT and MOSFET is_____________?


aIGBT


bFCT


cMCT


dGTO


View Answer IGBT

Delay time is defined by the interval when_______________?


agate current increases from 90 % to 100 % of its final value


banode current reaches 10 % from forward leakage current


canode voltage drops from 100 % to 90 % of its actual value


dall of these


View Answer all of these

Which one is most suitable power device for high frequency (>100 KHz) switching application?


aBJT


bPower MOSFET


cSchottky diode


dMicrowave transistor


View Answer Power MOSFET

Snubber circuit is used with SCR_________________?


ain series


bin parallel


ceither series or parallel


danti parallel


View Answer in parallel

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