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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

 65.
  37.14.
 3.714.
 60.

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Power Electronics
A diac is turned on by ___________.

None of these
A breakover voltage
Gate voltage
Gate current

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Power Electronics
Example of a voltage clamping device

 snubber circuit.
  metal oxide varistor.
 fast acting fuse.
 aluminium block.

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Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

 100 A.
  150 A.
 110 A.
 120 A.

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Power Electronics
For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

 115 ohm
  111.9 ohm
 11.19 ohm
 108 ohm

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Power Electronics
Which statement is true for latching current ?

 It is related to turn off process of the device.
  It is related to turn on process of the device.
 Both C and D.
 It is related to conduction process of device.

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