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Power Electronics

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

 40 mA.
  10 mA.
 60 mA.
 23 mA.

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Power Electronics
How can we protect SCR from thermal conditions ?

 Use of snubber circuit.
  Using heat sink.
 Using equalizing circuit.
 Using CB and fuse.

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Power Electronics
A power MOSFET has three terminals called

 Collector, emitter and gate.
 Drain, source and base.
 Collector, emitter and base.
  Drain, source and gate.

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Power Electronics
Which following is a two terminal three layer device?

 None of above.
 MOSFET.
  Power dioed.
 BJT.

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

FET
SCR
Diac
Triac

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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

 6, 4.
 4, 6.
  7, 5.
 5, 7.

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