Electrical Engineering MCQs

Page No. 357

Which statement is true ?


aReverse recovery time ( trr ) > gate recovery time (tgr)


b Device turn OFF time ( tq ) > reverse recover time (trr)


cCircuit turn OFF time > device turn OFF time ( tq )


d All of these


View Answer All of these

Which of following is normally ON device?


aSIT


bBJT


cTRIAC


dIGBT


View Answer SIT

Typical range of thyristor turn OFF time is______________?


a3 – 10 µs


b3 – 50 µs


c3 – 100 µs


d3 – 500 µs


View Answer 3 – 100 µs

Power transistor are type of___________?


aB.JTs


bMOSFETs


cIGBTs


dAll of above


View Answer All of above

During reverse recovery time__________________?


acharge carriers of J2 junction recombined


bcharge carriers of J2 junction is swept out


ccharge carrier of J1 junction removed


dcharge carriers of J3 junction is removed



Which of the following is true about SIT?


aSIT is a high power, high frequency device


bSIT is a high power, low frequency device


cSIT is a high power, high voltage device


dSIT is a low power, high frequency device



During which time maximum conduction spreading take place in the thyristor during turn ON?


aDelay time


bSpread time


cRise time


dSame for every case


View Answer Spread time

A GTO can be turned on by applying___________?


a Positive gate signal


bPositive drain signal


cPositive source signal


dNone of these



SITH is also known as___________?


aFilled controlled diode


bFilled controlled rectifier


cSilicon controlled rectifier


dNone of these



The typical time of rising time lies between______________?


a10 – 20 µs


b40 – 60 µs


c1 – 4 µs


d90 – 100 µs


View Answer 1 – 4 µs

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