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Power Electronics

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

  10 mA.
 23 mA.
 60 mA.
 40 mA.

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Power Electronics
After proper turn on of thyristor

  gate signal must be removed.
 gate signal is always present.
None of these
 gate signal should present but can be removed.

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

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

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Power Electronics
Practical way of obtaining static voltage equalization in series connected SCRs is by the use of

 one resistor across the string.
  resistors of the same value across each SCR.
 one resistor in series with each SCR.
 resistors of different values across each SCR.

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Power Electronics
SCRs are used in series to meet

 high current demand.
  high voltage demand.
 low current demand.
 low voltage demand.

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Power Electronics
Switching frequency of SITH is

 5 KHz.
 10 KHz.
  100 KHz.
 60 KHz.

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