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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

 60.
  37.14.
 3.714.
 65.

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Power Electronics
A diac is turned on by ___________.

A breakover voltage
Gate voltage
Gate current
None of these

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Power Electronics
A thyristor can termed as

 Square wave switch.
 AC switch.
  DC switch.
 Both a and B.

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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 ?

  0.3 ohm
 0.03 ohm
 3.0 ohm
 0.3 ohm

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

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

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Power Electronics
Typical range of thyristor turn OFF time is

 3 - 500 µs.
 3 - 10 µs.
 3 - 50 µs.
  3 - 100 µs.

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