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Power Electronics

Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.002 A.
 0.01 A.
  0.004 A.
 0.009 A.

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Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 30° to 150°.
 30° to 180°.
 60° to 180°.
 60° to 120°.

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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.
 140 μs.
  135 μs.
 130 μs.

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Power Electronics
When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.

None of these
High
Low
Extremely low

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Power Electronics
A triac is a ___________ switch

None of these
Unidirectional
Mechanical
Bidirectional

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

None of these
Is decreased
Remains the same
Is increased

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