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Power Electronics

Power Electronics
A triac has ___________ semiconductor layers.

Five
Three
Four
Two

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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

  76.3 %.
 90.9 %.
 83.3 %.
 91.6 %.

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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

Transistor
UJT
None of these
SCR

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Power Electronics
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is

 145 μs.
 130 μs.
 140 μs.
  135 μs.

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Power Electronics
Thyristor is nothing but a

 Amplifier with large current gain.
 Controlled transistor.
 Amplifier with higher gain.
  Controlled switch.

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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?

 3.2 µs
 3.1 µs
 3 µs.
  3.3 µs

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