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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.
 40 mA.
 60 mA.

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Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

  N1.
 N2.
 P1.
 P2.

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

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

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Power Electronics
A diac is ___________ switch

None of these
An c.
A d.c.
A mechanical

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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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