POWER ELECTRONICS QUIZ

A triac can pass a portion of ___________ half-cycle through the load.

Only positive

Both positive and negative

None of these

Only negative

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal voltage VT can be given by

Kq/T.

(K2/q)(T + 1/T - 1).

KT/q.

qT/K.

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For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

108 ohm

11.19 ohm

115 ohm

111.9 ohm

TRUE ANSWER : ?
YOUR ANSWER : ?

A diac is ___________ switch

An c.

None of these

A mechanical

A d.c.

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A UJT has ___________.

One pn junction

None of these

Three pn junctions

Two pn junctions

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A power semiconductor may undergo damage due to

Low di/dt.

Low dv/dt.

High di/dt.

High dv/dt.

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YOUR ANSWER : ?

How can we protect SCR from thermal conditions ?

Using heat sink.

Using CB and fuse.

Use of snubber circuit.

Using equalizing circuit.

TRUE ANSWER : ?
YOUR ANSWER : ?

A diac has ___________ terminals.

None of these

Three

Two

Four

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

Spread time.

Delay time.

Rise time.

Same for every case.

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

Thyristor.

TRIACs.

Semi conductor diodes.

MOSFETs.

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YOUR ANSWER : ?

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