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Power Electronics

Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

More than
Less than
Equal to
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 underdamped.
 RLC critically damped.
 RLC overdamped.
 RL.

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Power Electronics
SITH is also known as

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

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Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

  100 µs.
 150 µs.
 300 µs.
 200 µs.

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Power Electronics
By which one of the following we can measure the reliability of a string?

 Factor of safety.
 String efficient.
 Reliability factor.
  Derating factor.

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Power Electronics
After proper turn on of thyristor

 gate signal is always present.
 gate signal should present but can be removed.
  gate signal must be removed.
None of these

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