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Power Electronics

Power Electronics
A diac is turned on by ___________.

None of these
Gate current
Gate voltage
A breakover voltage

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

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

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

  of long period.
 both (A) and (B).
 of short duration.
 neither (A) nor (B).

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Power Electronics
A thyristor can termed as

 Both a and B.
  DC switch.
 Square wave switch.
 AC switch.

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

  2 KVA.
 1 KVA.
 500 VA.
 100 KVA.

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Power Electronics
A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be

 4, 6.
  7, 5.
 5, 7.
 6, 4.

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