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Power Electronics

Power Electronics
Which of following is not a power transistor?

 SITS.
 COOLMOS.
 IGBTs.
  TRIAC.

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Power Electronics
The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant

UJT
SCR
None of these
Transistor

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Power Electronics
A single phase full bridge inverter can operate in load commutation mode in case load consists of

  RLC underdamped.
 RL.
 RLC critically damped.
 RLC overdamped.

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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
A triac is a ___________ switch

Unidirectional
Bidirectional
Mechanical
None of these

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Power Electronics
Light triggering mainly used in

 low - voltage direct current transmission.
  all of these.
  high voltage direct current transmission.
 medium voltage direct current transmission.

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