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Power Electronics

Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 3.714.
 60.
  37.14.
 65.

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Power Electronics
A triac has ___________ semiconductor layers.

Three
Two
Four
Five

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Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

Remains the same
Decreases
Increases
None of these

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Power Electronics
Which triggering is the most reliable?

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

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

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

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Power Electronics
Leakage current flows through the thyristor in

  both forward and reverse blocking mode.
 forward blocking mode.
 forward conduction mode.
 reverse blocking mode.

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