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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 60 mA.
 23 mA.
  10 mA.
 40 mA.

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

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

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.009 A.
 0.002 A.
  0.004 A.
 0.01 A.

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Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

 3.1 µs
 3.2 µs
  3.3 µs
 3 µs.

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Power Electronics
A GTO can be turned on by applying

 Positive source signal.
 None of these.
 Positive drain signal.
  Positive gate signal.

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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
  0.3 ohm
 3.0 ohm

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