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Power Electronics

Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

  N1.
 P2.
 N2.
 P1.

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Power Electronics
Anode current in an SCR consists of

  Both electron and holes.
  holes only.
  electrons only.
  either electron or holes.

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Power Electronics
When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ?

  Fast acting current limiting device (FACL fuse).
 Voltage clamping device.
 CB.
 Snubber circuit.

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Power Electronics
Which of the following is not a characteristic of UJT?

Bilateral conduction
Peak-point voltage
Negative resistance
Intrinsic stand off ratio

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Power Electronics
SITH is also known as

  Filled controlled diode.
 Filled controlled rectifier.
 None of these.
 Silicon controlled rectifier.

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Power Electronics
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________

Remains the same
None of these
Is increased
Is decreased

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