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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

 65.
 3.714.
 60.
  37.14.

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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 ?

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

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Power Electronics
A single phase full bridge inverter can operated in load commutation mode in case load consist of

 RLC overdamped.
 RL.
 RLC underdamped.
 RLC critically damped.

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Power Electronics
In a UJT, the p-type emitter is ___________ doped

Moderately
Lightly
None of these
Heavily

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Power Electronics
A UJT has ___________.

None of these
One pn junction
Two pn junctions
Three pn junctions

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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
More than
Less than
None of these

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