POWER ELECTRONICS QUIZ

During reverse recovery time

charge carrier of junction J3 is swept out.

charge carrier of junction J1 is swept out.

charge carrier of junction J2 recombined.

both B and C.

TRUE ANSWER : ?
YOUR ANSWER : ?

A diac has ___________ pn junctions

Two

Three

Four

None of these

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YOUR ANSWER : ?

The latching current of SCR is 20 mA. Its holding current will be

23 mA.

40 mA.

10 mA.

60 mA.

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum power loss occurs during

delay time.

spread time.

rise time.

all.

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YOUR ANSWER : ?

The triac is ___________.

Not a thyristor

Like a bidirectional SCR

None of these

A four-terminal device

TRUE ANSWER : ?
YOUR ANSWER : ?

Light triggering mainly used in

high voltage direct current transmission.

low - voltage direct current transmission.

all of these.

medium voltage direct current transmission.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which triggering is the most reliable?

dV / dt triggering.

Gate triggering.

Thermal triggering.

Forward voltage triggering.

TRUE ANSWER : ?
YOUR ANSWER : ?

Gate circuit or triggering circuit of a thyristor is

may be low power or high power circuit.

lower power circuit.

magnetic circuit.

high power circuit.

TRUE ANSWER : ?
YOUR ANSWER : ?

A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be

5, 7.

4, 6.

7, 5.

6, 4.

TRUE ANSWER : ?
YOUR ANSWER : ?

A diac has ___________ terminals.

Four

None of these

Three

Two

TRUE ANSWER : ?
YOUR ANSWER : ?

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