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Power Electronics

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

  10 mA.
 60 mA.
 23 mA.
 40 mA.

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Power Electronics
Gate circuit or triggering circuit of a thyristor is

  lower power circuit.
 magnetic circuit.
 high power circuit.
 may be low power or high power circuit.

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Power Electronics
A triac is a ___________ switch

Mechanical
Bidirectional
None of these
Unidirectional

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

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

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Power Electronics
Typical range of thyristor turn OFF time is

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

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Power Electronics
What is used to protect the SCR from over current ?

  CB and fuse.
 Heat sink.
 Snubber circuit.
 Voltage clamping device.

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