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Power Electronics

Power Electronics
The UJT may be used as ___________.

None of these
Am amplifier
A sawtooth generator
A rectifier

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Power Electronics
The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant

SCR
None of these
UJT
Transistor

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 91.6 %.
 83.3 %.
 90.9 %.
  76.3 %.

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Power Electronics
Snubber circuit is used with SCR

  in parallel.
 either series or parallel.
 anti parallel.
 in series.

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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

 70.
  80.
 90.
 60.

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Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

 3 µs.
 3.2 µs
  3.3 µs
 3.1 µs

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