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Power Electronics

Power Electronics
Thermal voltage VT can be given by

 (K2/q)(T + 1/T - 1).
 qT/K.
  Kq/T.
 KT/q.

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 91.6 %.
  76.3 %.
 83.3 %.
 90.9 %.

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Power Electronics
The device that does not have the gate terminal is ___________.

SCR
Diac
FET
Triac

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Power Electronics
COOLMOS device can be used in application up to power range of

  2 KVA.
 1 KVA.
 100 KVA.
 500 VA.

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Power Electronics
By which one of the following we can measure the reliability of a string?

 Factor of safety.
  Derating factor.
 Reliability factor.
 String efficient.

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Power Electronics
A GTO can be turned on by applying

 None of these.
 Positive drain signal.
 Positive source signal.
  Positive gate signal.

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