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Power Electronics

Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.002 A.
  0.004 A.
 0.01 A.
 0.009 A.

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Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

 1200 V/µs.
 1000 V/µs.
 600 V/µs.
  800 V/µs.

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Power Electronics
The UJT may be used as ___________.

None of these
Am amplifier
A rectifier
A sawtooth generator

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

Less than
Equal to
More than
None of these

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Power Electronics
Switching frequency of SITH is

 5 KHz.
 60 KHz.
  100 KHz.
 10 KHz.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Rise time.
 Same for every case.
 Delay time.
  Spread time.

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