POWER ELECTRONICS QUIZ

Snubber circuit is used with SCR

anti parallel.

in parallel.

in series.

either series or parallel.

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YOUR ANSWER : ?

The normal way to turn on a diac is by ___________.

Gate current

Breakover voltage

Gate voltage

None of these

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A diac has ___________ terminals.

Two

Four

None of these

Three

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Which of following is not a power transistor?

SITS.

TRIAC.

IGBTs.

COOLMOS.

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Practical way of obtaining static voltage equalization in series connected SCRs is by the use of

resistors of different values across each SCR.

resistors of the same value across each SCR.

one resistor in series with each SCR.

one resistor across the string.

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Which following is a two terminal three layer device?

None of above.

Power dioed.

BJT.

MOSFET.

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The triac is ___________.

Not a thyristor

Like a bidirectional SCR

A four-terminal device

None of these

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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.

6, 4.

7, 5.

4, 6.

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If the anode current is 800 A, then the amount of current required to turn off the GTO is about

200 A.

20 A.

400 A.

600 A.

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Which one is most suitable power device for high frequency (>100 KHz) switching application?

Power MOSFET.

Microwave transistor.

BJT.

Schottky diode.

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YOUR ANSWER : ?

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