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Power Electronics

Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.45.
  0.67.
  0.27.
  0.32.

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Power Electronics
Which of the following is disadvantage of fast recovery diodes?

 Recovery is only 5 µs.
 Recovery is only 50 µs.
  Doping is carried out.
 None of these.

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

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

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Power Electronics
SITH is also known as

  Filled controlled diode.
 None of these.
 Filled controlled rectifier.
 Silicon controlled rectifier.

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Power Electronics
Which of following is normally ON device

 IGBT.
 TRIAC.
  SIT.
 BJT.

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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.
 0.002 A.
  0.004 A.

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