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Power Electronics

Power Electronics
A power semiconductor may undergo damage due to

 High dv/dt.
 Low dv/dt.
 Low di/dt.
  High di/dt.

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Power Electronics
A single phase full bridge inverter can operate in load commutation mode in case load consists of

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

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Power Electronics
Which statement is true for latching current ?

 Both C and D.
  It is related to turn on process of the device.
 It is related to conduction process of device.
 It is related to turn off process of the device.

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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?

 11.19 ohm
 108 ohm
 115 ohm
  111.9 ohm

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Power Electronics
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is

 130 μs.
  135 μs.
 140 μs.
 145 μs.

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

  0.3 ohm
 0.03 ohm
 3.0 ohm
 0.3 ohm

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