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Power Electronics

Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

More than
None of these
Equal to
Less than

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

  2 KVA.
 500 VA.
 100 KVA.
 1 KVA.

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Power Electronics
Switching frequency of SITH is

 10 KHz.
 5 KHz.
  100 KHz.
 60 KHz.

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Power Electronics
SCRs are used in series to meet

 high current demand.
  high voltage demand.
 low voltage demand.
 low current demand.

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Power Electronics
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is

 130 μs.
  135 μs.
 140 μs.
 145 μs.

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Power Electronics
Which statement is true for latching current ?

  It is related to turn on process of the device.
 Both C and D.
 It is related to turn off process of the device.
 It is related to conduction process of device.

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