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Power Electronics

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
When the temperature increases, the intrinsic stand off ratio ___________.

Decreases
Essentially remains the same
None of these
Increases

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 83.3 %.
  76.3 %.
 91.6 %.
 90.9 %.

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Power Electronics
SCRs are used in series to meet

 low voltage demand.
 high current demand.
  high voltage demand.
 low current demand.

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

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Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

Frequencies above 20 kHz
50 Hz frequency
Frequencies less than 10 Hz
Frequencies above 1000 kHz

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