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Power Electronics

Power Electronics
A triac is a ___________ switch

None of these
Mechanical
Unidirectional
Bidirectional

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Power Electronics
A single phase full bridge inverter can operated in load commutation mode in case load consist of

 RLC critically damped.
 RLC underdamped.
 RL.
 RLC overdamped.

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Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

50 Hz frequency
Frequencies less than 10 Hz
Frequencies above 20 kHz
Frequencies above 1000 kHz

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Power Electronics
A triac can pass a portion of ___________ half-cycle through the load.

Both positive and negative
Only negative
None of these
Only positive

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

  Inductor.
 Fuse.
 Snubber circuit.
 Voltage clamping device.

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Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

 3 µs.
 3.2 µs
 3.1 µs
  3.3 µs

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