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Power Electronics

Power Electronics
The triac is ___________.

None of these
A four-terminal device
Like a bidirectional SCR
Not a thyristor

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.002 A.
 0.009 A.
  0.004 A.
 0.01 A.

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Power Electronics
Which triggering is the most reliable?

  Thermal triggering.
  dV / dt triggering.
  Gate triggering.
  Forward voltage triggering.

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Power Electronics
When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.

None of these
Extremely low
Low
High

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

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

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Power Electronics
The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will

 Turn on if inductance is removed.
  Turn on.
 Not turn on.
 Turn on if pulse frequency us increased to two times.

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