Electrical Engineering MCQs

Page No. 359

Why resistor is used in Snubber circuit_________________ ?


aTo minimize the loss

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bTo minimize the charging current

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cTo minimize the discharging current

✓


dAll of these

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What may happen high dV / dt____________?


aUnwanted turn ON

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bBreakdown of J2 junction

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cBoth A and B

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dAnyone of these

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View Answer Both A and B

Thermal voltage VT can be given by____________?


aKq/T

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bKT/q

✓


cqT/K

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d(K2/q)(T + 1/T – 1)

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View Answer KT/q

What happen due to high di / dt____________?


aBreakdown of junction

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bLocal hot spot

✓


cInsulation failure

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dNone of these

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View Answer Local hot spot

IGBT combines the advantages of_____________?


aBJTs and SITs

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bBJTs and MOSFETs

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cSITs and MOSFETs

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dNone of these

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View Answer BJTs and MOSFETs

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


aSnubber circuit

✓


bFuse

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cEqualizing circuit

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dCircuit breaker

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View Answer Snubber circuit

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


a1 KVA

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b2 KVA

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c500 VA

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d100 KVA

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View Answer 2 KVA

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


aFuse.

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bSnubber circuit

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cInductor

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dVoltage clamping device

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View Answer Inductor

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


aTRIACs

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bSemi conductor diodes

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cMOSFETs

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dThyristor

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View Answer Thyristor

Materials used in heat sink should have_____________?


ahigh thermal conductivity

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blarge surface area

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chigh melting point

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dAll of these

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View Answer All of these

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