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Power Electronics

Power Electronics
A power semiconductor may undergo damage due to

  High di/dt.
 Low dv/dt.
 High dv/dt.
 Low di/dt.

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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.
  0.45.
  0.67.
  0.32.

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Power Electronics
The device that exhibits negative resistance region is ___________.

Transistor
Triac
Diac
UJT

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

Saturation
Cut-off
None of these
Negative resistance

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

 moderate value.
  high value.
 low value.
 zero value.

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 6000 A.
 1500 A.
 4242.64 A.
 2121.32 A.

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