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Power Electronics

Power Electronics
After peak point, the UJT operates in the ___________ region.

Saturation
Negative resistance
None of these
Cut-off

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Power Electronics
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is

 140 μs.
 130 μs.
 145 μs.
  135 μs.

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Power Electronics
Which following is a two terminal three layer device?

 None of above.
 BJT.
  Power dioed.
 MOSFET.

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

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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?

 11.19 ohm
 108 ohm
 115 ohm
  111.9 ohm

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Power Electronics
SITH is also known as

 None of these.
  Filled controlled diode.
 Silicon controlled rectifier.
 Filled controlled rectifier.

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