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Power Electronics

Power Electronics
A triac is a ___________ switch

None of these
Bidirectional
Unidirectional
Mechanical

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Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

 600 V/µs.
 1000 V/µs.
 1200 V/µs.
  800 V/µs.

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Power Electronics
The triac is ___________.

Not a thyristor
None of these
A four-terminal device
Like a bidirectional SCR

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Power Electronics
For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

 115 ohm
  111.9 ohm
 108 ohm
 11.19 ohm

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

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

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Power Electronics
IGBT combines the advantages of

  BJTs and MOSFETs.
 BJTs and SITs.
 None of these.
 SITs and MOSFETs.

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