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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 60 mA.
 23 mA.
  10 mA.
 40 mA.

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Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

None of these
Less than
Equal to
More than

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Power Electronics
The function of snubber circuit connected across the SCR is to

 increase dV / dt.
 decrease di / dt.
  suppress dV / dt.
 decrease dV / dt.

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Power Electronics
Typical range of thyristor turn OFF time is

 3 - 50 µs.
 3 - 10 µs.
  3 - 100 µs.
 3 - 500 µs.

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Power Electronics
A triac can pass a portion of ___________ half-cycle through the load.

None of these
Both positive and negative
Only positive
Only negative

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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

  0.45.
  0.67.
  0.27.
  0.32.

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