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Power Electronics

Power Electronics
A diac is turned on by ___________.

A breakover voltage
Gate voltage
Gate current
None of these

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Power Electronics
For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

  111.9 ohm
 115 ohm
 11.19 ohm
 108 ohm

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

UJT
Triac
Diac
Transistor

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

Equal to
None of these
More than
Less than

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

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Power Electronics
Which triggering is the most reliable?

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

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