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Power Electronics

Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

  150 A.
 120 A.
 110 A.
 100 A.

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Power Electronics
During reverse recovery time

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

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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.

 200 µs.
  100 µs.
 150 µs.
 300 µs.

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Power Electronics
Which of the following is disadvantage of fast recovery diodes?

 Recovery is only 5 µs.
 Recovery is only 50 µs.
  Doping is carried out.
 None of these.

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Power Electronics
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________

Remains the same
Is decreased
None of these
Is increased

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Power Electronics
A UJT is sometimes called ___________ diode.

High resistance
Single-base
Double-base
Low resistance

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