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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

  0.32.
  0.67.
  0.27.
  0.45.

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Power Electronics
Materials used in heat sink should have

 high thermal conductivity.
 large surface area.
  All of these.
 high melting point.

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Power Electronics
Why resistor is used in Snubber circuit ?

 To minimize the loss .
 To minimize the charging current.
 All of these.
  To minimize the discharging current.

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Power Electronics
A power MOSFET has three terminals called

 Collector, emitter and base.
 Collector, emitter and gate.
  Drain, source and gate.
 Drain, source and base.

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Power Electronics
A triac has ___________ semiconductor layers.

Two
Three
Five
Four

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Power Electronics
Switching frequency of SITH is

  100 KHz.
 10 KHz.
 60 KHz.
 5 KHz.

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