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Power Electronics

Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

 SIT.
  GTO.
 SITH.
 SCR.

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Power Electronics
Materials used in heat sink should have

 high melting point.
 high thermal conductivity.
  All of these.
 large surface area.

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

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

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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

 83.3 %.
 90.9 %.
  76.3 %.
 91.6 %.

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

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

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