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Power Electronics

Power Electronics
COOLMOS device can be used in application up to power range of

 1 KVA.
 500 VA.
  2 KVA.
 100 KVA.

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Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

More than
Less than
None of these
Equal to

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Power Electronics
Which semiconductor device acts like a diode and two transistor?

  Triac.
 Diac.
 SCR.
 UJT.

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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?

 10 KV.
  8 KV.
 2 KV.
 6 KV.

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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.

 300 µs.
 150 µs.
 200 µs.
  100 µs.

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Power Electronics
BCT is used for

 High power current control.
 Low power phase control.
 Low power current control.
  High power phase control.

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