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Power Electronics

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

 SIT.
 SITH.
  GTO.
 SCR.

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Power Electronics
Example of a voltage clamping device

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

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Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

None of these
Increases
Remains the same
Decreases

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Power Electronics
During reverse recovery time

 charge carrier of junction J2 recombined.
 charge carrier of junction J3 is swept out.
  both B and C.
 charge carrier of junction J1 is swept out.

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

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

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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

 120 A.
  150 A.
 110 A.
 100 A.

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