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Power Electronics

Power Electronics
A diac has ___________ terminals.

None of these
Three
Four
Two

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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
The triac is ___________.

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

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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.
 1000 V/µs.
  800 V/µs.
 1200 V/µs.

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Power Electronics
When the temperature increases, the intrinsic stand off ratio ___________.

None of these
Essentially remains the same
Decreases
Increases

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Power Electronics
The maximum di/dt in a SCR is

 Inversely proportional to supply voltage.
 Directly proportional to inductance in the circuit.
  Both A and B.
 Directly proportional to supply voltage.

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