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Power Electronics

Power Electronics
The UJT may be used as ___________.

A sawtooth generator
Am amplifier
None of these
A rectifier

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

Gate current
Breakover voltage
None of these
Gate voltage

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Power Electronics
Materials used in heat sink should have

 large surface area.
 high melting point.
  All of these.
 high thermal conductivity.

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Power Electronics
Which of following is not a power transistor?

 SITS.
 IGBTs.
 COOLMOS.
  TRIAC.

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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?

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

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

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

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