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Power Electronics

Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

 110 A.
  150 A.
 120 A.
 100 A.

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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
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
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

 140 μs.
  135 μs.
 130 μs.
 145 μs.

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Power Electronics
IGBT combines the advantages of

  BJTs and MOSFETs.
 BJTs and SITs.
 SITs and MOSFETs.
 None of these.

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 91.6 %.
 83.3 %.
  76.3 %.
 90.9 %.

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