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Power Electronics

Power Electronics
A triac has ___________ semiconductor layers.

Three
Five
Four
Two

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Power Electronics
SITH is also known as

  Filled controlled diode.
 Filled controlled rectifier.
 Silicon controlled rectifier.
 None of these.

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Power Electronics
A power semiconductor may undergo damage due to

  High di/dt.
 Low dv/dt.
 High dv/dt.
 Low di/dt.

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Power Electronics
Typical range of thyristor turn OFF time is

  3 - 100 µs.
 3 - 500 µs.
 3 - 50 µs.
 3 - 10 µs.

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Power Electronics
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

  7, 5.
 6, 4.
 5, 7.
 4, 6.

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Power Electronics
A UJT has ___________.

Two pn junctions
Three pn junctions
One pn junction
None of these

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