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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.
  0.32.
  0.27.
  0.45.

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Power Electronics
Which of the following is not a characteristic of UJT?

Peak-point voltage
Negative resistance
Bilateral conduction
Intrinsic stand off ratio

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Power Electronics
Anode current in an SCR consists of

  Both electron and holes.
  holes only.
  electrons only.
  either electron or holes.

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Power Electronics
Which triggering is the most reliable?

  Gate triggering.
  Forward voltage triggering.
  Thermal triggering.
  dV / dt triggering.

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Power Electronics
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________

Is decreased
Remains the same
Is increased
None of these

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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

  135 μs.
 140 μs.
 130 μs.
 145 μs.

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