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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

  0.45.
  0.67.
  0.27.
  0.32.

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Power Electronics
Which statement is true for latching current ?

 It is related to turn off process of the device.
  It is related to turn on process of the device.
 It is related to conduction process of device.
 Both C and D.

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

Extremely low
High
None of these
Low

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Power Electronics
A diac is simply ___________.

None of these
A single junction device
A three junction device
A triac without gate terminal

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

Negative resistance
Cut-off
None of these
Saturation

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