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Power Electronics

Power Electronics
A diac is ___________ switch

None of these
An c.
A mechanical
A d.c.

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Power Electronics
A diac is turned on by ___________.

Gate current
None of these
A breakover voltage
Gate voltage

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

None of these
Low
High
Extremely low

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

  0.45.
  0.32.
  0.27.
  0.67.

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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
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 ?

  0.3 ohm
 0.03 ohm
 3.0 ohm
 0.3 ohm

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