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Power Electronics

Power Electronics
A triac is a ___________ switch

Bidirectional
Mechanical
None of these
Unidirectional

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

 moderate value.
 low value.
  high value.
 zero value.

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Power Electronics
Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

  8 KV.
 2 KV.
 10 KV.
 6 KV.

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Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 3.714.
 60.
  37.14.
 65.

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Power Electronics
Which of the following is used in SCR to protect from high dV / dt?

 Fuse.
 Equalizing circuit.
 Circuit breaker.
  Snubber circuit.

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Power Electronics
If the anode current is 800 A, then the amount of current required to turn off the GTO is about

 600 A.
 20 A.
  200 A.
 400 A.

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