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Power Electronics

Power Electronics
A diac is ___________ switch

An c.
A mechanical
None of these
A d.c.

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Power Electronics
In a UJT, the p-type emitter is ___________ doped

None of these
Lightly
Moderately
Heavily

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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.
 1200 V/µs.
 1000 V/µs.

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Power Electronics
Which of the following is not a characteristic of UJT?

Intrinsic stand off ratio
Peak-point voltage
Bilateral conduction
Negative resistance

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Power Electronics
Anode current in an SCR consists of

  Both electron and holes.
  electrons only.
  holes only.
  either electron or holes.

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Power Electronics
The triac is ___________.

Not a thyristor
None of these
Like a bidirectional SCR
A four-terminal device

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