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Power Electronics

Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 3.714.
 65.
  37.14.
 60.

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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 ?

 0.03 ohm
  0.3 ohm
 3.0 ohm
 0.3 ohm

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Power Electronics
A Triac has three terminals viz ___________

None of these
Drain, source, gate
Two main terminal and a gate terminal
Cathode, anode, gate

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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

 90.9 %.
 83.3 %.
 91.6 %.
  76.3 %.

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Power Electronics
After proper turn on of thyristor

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

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Power Electronics
Maximum power loss occurs during

 spread time.
 delay time.
  rise time.
 all.

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