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Power Electronics

Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.67.
  0.45.
  0.27.
  0.32.

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Power Electronics
A diac has ___________ semiconductor layers

Two
Three
None of these
Four

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Power Electronics
The typical value of SCR for modern alternator is

 1.5.
 0.5.
 1.0.
 1.2.

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

 0.03 ohm
 0.3 ohm
  0.3 ohm
 3.0 ohm

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Power Electronics
A diac has ___________ terminals.

Four
Two
Three
None of these

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Power Electronics
The typical time of rising time lies between

 90 - 100 µs.
  1 - 4 µs.
 10 - 20 µs.
 40 - 60 µs.

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