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Power Electronics

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

 3.714.
 65.
  37.14.
 60.

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

Both positive and negative
Only positive
None of these
Only negative

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Power Electronics
During reverse recovery time

  both B and C.
 charge carrier of junction J1 is swept out.
 charge carrier of junction J3 is swept out.
 charge carrier of junction J2 recombined.

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

  of long period.
 both (A) and (B).
 of short duration.
 neither (A) nor (B).

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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.
  resistors of the same value across each SCR.
 one resistor in series with each SCR.
 one resistor across the string.

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Power Electronics
A triac has ___________ semiconductor layers.

Five
Four
Two
Three

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