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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.
  0.32.
  0.27.

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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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Power Electronics
A diac is simply ___________.

A three junction device
A single junction device
None of these
A triac without gate terminal

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Power Electronics
COOLMOS device can be used in application up to power range of

 500 VA.
 100 KVA.
  2 KVA.
 1 KVA.

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Power Electronics
Materials used in heat sink should have

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

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

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

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