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Power Electronics

Power Electronics
A triac is a ___________ switch

Mechanical
Unidirectional
Bidirectional
None of these

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

  0.3 ohm
 3.0 ohm
 0.03 ohm
 0.3 ohm

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

 1 KVA.
  2 KVA.
 500 VA.
 100 KVA.

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Power Electronics
After proper turn on of thyristor

  gate signal must be removed.
None of these
 gate signal is always present.
 gate signal should present but can be removed.

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Power Electronics
A thyristor can termed as

 AC switch.
 Square wave switch.
 Both a and B.
  DC switch.

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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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