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Power Electronics

Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 infinity.
 moderate.
 high.
  low.

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Power Electronics
A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be

 4, 6.
  7, 5.
 6, 4.
 5, 7.

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Power Electronics
Gate circuit or triggering circuit of a thyristor is

 magnetic circuit.
  lower power circuit.
 may be low power or high power circuit.
 high power circuit.

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Power Electronics
A UJT is sometimes called ___________ diode.

High resistance
Single-base
Double-base
Low resistance

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Power Electronics
IGBT combines the advantages of

 None of these.
 BJTs and SITs.
 SITs and MOSFETs.
  BJTs and MOSFETs.

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Power Electronics
A thyristor can termed as

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

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