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Power Electronics

Power Electronics
When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.

Low
Extremely low
None of these
High

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Power Electronics
During reverse recovery time

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

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Power Electronics
Which of the following is used in heat sink?

 Carbon.
 Silver.
 Iron.
  Aluminium.

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

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Power Electronics
Which of the following is used in SCR to protect from high dV / dt?

  Snubber circuit.
 Fuse.
 Circuit breaker.
 Equalizing circuit.

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Power Electronics
Spread time is defined as the interval during which

 both (A) and (B).
 anode current rises from 10 % to 90 % of its final value.
 anode voltage drops from 10 % of its initial value to zero.
  anode current rises from 90 % to its final value.

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