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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 60 mA.
 40 mA.
  10 mA.
 23 mA.

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Power Electronics
For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

 115 ohm
  111.9 ohm
 108 ohm
 11.19 ohm

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Power Electronics
Spread time is defined as the interval during which

 both (A) and (B).
  anode current rises from 90 % to its final value.
 anode voltage drops from 10 % of its initial value to zero.
 anode current rises from 10 % to 90 % of its final value.

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Power Electronics
A single phase full bridge inverter can operated in load commutation mode in case load consist of

 RLC critically damped.
 RLC underdamped.
 RL.
 RLC overdamped.

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

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

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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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