Electrical Engineering MCQs

Page No. 359

Why resistor is used in Snubber circuit_________________ ?


aTo minimize the loss


bTo minimize the charging current


cTo minimize the discharging current


dAll of these



What may happen high dV / dt____________?


aUnwanted turn ON


bBreakdown of J2 junction


cBoth A and B


dAnyone of these


View Answer Both A and B

Thermal voltage VT can be given by____________?


aKq/T


bKT/q


cqT/K


d(K2/q)(T + 1/T – 1)


View Answer KT/q

What happen due to high di / dt____________?


aBreakdown of junction


bLocal hot spot


cInsulation failure


dNone of these


View Answer Local hot spot

IGBT combines the advantages of_____________?


aBJTs and SITs


bBJTs and MOSFETs


cSITs and MOSFETs


dNone of these


View Answer BJTs and MOSFETs

Which of the following is used in SCR to protect from high dV / dt__________________?


aSnubber circuit


bFuse


cEqualizing circuit


dCircuit breaker


View Answer Snubber circuit

COOLMOS device can be used in application up to power range of___________?


a1 KVA


b2 KVA


c500 VA


d100 KVA


View Answer 2 KVA

What is used to protect a thyristor from high di / dt conditions__________?


aFuse.


bSnubber circuit


cInductor


dVoltage clamping device


View Answer Inductor

Compared to transistor, _________ have lower on state conduction losses and higher power handling capability?


aTRIACs


bSemi conductor diodes


cMOSFETs


dThyristor


View Answer Thyristor

Materials used in heat sink should have_____________?


ahigh thermal conductivity


blarge surface area


chigh melting point


dAll of these


View Answer All of these

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