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Power Electronics

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

None of these
Decreases
Remains the same
Increases

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

 0.3 ohm
 3.0 ohm
  0.3 ohm
 0.03 ohm

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Power Electronics
A diac has ___________ pn junctions

Four
Two
None of these
Three

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Power Electronics
A diac is ___________ switch

A mechanical
An c.
A d.c.
None of these

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

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

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Power Electronics
Thyristor can be protected from over voltages by using

 fuse.
 snubber circuit.
 heat sink.
  voltage clamping device.

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