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Power Electronics

Power Electronics
A UJT is sometimes called ___________ diode.

Double-base
Low resistance
Single-base
High resistance

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Power Electronics
A triac is equivalent to two SCRs ___________.

In inverse-parallel
In series
None of these
In parallel

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Power Electronics
SCRs are used in series to meet

 low voltage demand.
  high voltage demand.
 low current demand.
 high current demand.

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 70.
  80.
 90.
 60.

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

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

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Power Electronics
Gate circuit or triggering circuit of a thyristor is

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

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