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Power Electronics

Power Electronics
After peak point, the UJT operates in the ___________ region.

Saturation
Negative resistance
None of these
Cut-off

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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.
 140 μs.
 145 μs.
  135 μs.

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Power Electronics
A GTO can be turned on by applying

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

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Power Electronics
The normal way to turn on a diac is by ___________.

Breakover voltage
None of these
Gate voltage
Gate current

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 2121.32 A.
 1500 A.
 6000 A.
 4242.64 A.

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Power Electronics
A Triac has three terminals viz ___________

Cathode, anode, gate
Two main terminal and a gate terminal
None of these
Drain, source, gate

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