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Power Electronics

Power Electronics
The typical value of SCR for modern alternator is

 0.5.
 1.5.
 1.0.
 1.2.

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

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

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 90.
 70.
  80.
 60.

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Power Electronics
During reverse recovery time

  both B and C.
 charge carrier of junction J3 is swept out.
 charge carrier of junction J2 recombined.
 charge carrier of junction J1 is swept out.

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

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

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 4242.64 A.
 1500 A.
 6000 A.
 2121.32 A.

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