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Power Electronics

Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

  low.
 moderate.
 high.
 infinity.

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Power Electronics
During reverse recovery time

 charge carrier of junction J1 is swept out.
 charge carrier of junction J2 recombined.
 charge carrier of junction J3 is swept out.
  both B and C.

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

  0.27.
  0.67.
  0.32.
  0.45.

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Power Electronics
A diac is turned on by ___________.

None of these
Gate voltage
Gate current
A breakover voltage

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

 1 KVA.
  2 KVA.
 500 VA.
 100 KVA.

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 83.3 %.
  76.3 %.
 90.9 %.
 91.6 %.

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