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Power Electronics

Power Electronics
A triac is a ___________ switch

Bidirectional
None of these
Mechanical
Unidirectional

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

High
Extremely low
None of these
Low

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 91.6 %.
 83.3 %.
 90.9 %.
  76.3 %.

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Power Electronics
Which one is most suitable power device for high frequency (>100 KHz) switching application?

  Power MOSFET.
 Schottky diode.
 BJT.
 Microwave transistor.

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

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

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Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 60.
  37.14.
 65.
 3.714.

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