Electrical Engineering Mcqs

Gate circuit or triggering circuit of a thyristor is

(A) lower power circuit.

(B) high power circuit.

(C) magnetic circuit.

(D) may be low power or high power circuit

Submitted By: Ali Uppal


After proper turn on of thyristor____________?

(A) gate signal is always present

(B) gate signal must be removed

(C) gate signal should present but can be removed

(D) none of the abov

Submitted By: Ali Uppal


SCR will be turned off when anode current is_______________?

(A) < latching current but greater than holding current and gate signal is 0.

(B) less than holding current.

(C) < latching current but greater than holding current and gate signal is present.

(D) both (A) and (B).

Submitted By: Ali Uppal


Submitted By: Ali Uppal


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

(A) BJT

(B) Power MOSFET

(C) Schottky diode

(D) Microwave transistor

Submitted By: Ali Uppal


Snubber circuit is used with SCR_________________?

(A) in series

(B) in parallel

(C) either series or parallel

(D) anti parallel

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Why resistor is used in Snubber circuit_________________ ?

(A) To minimize the loss

(B) To minimize the charging current

(C) To minimize the discharging current

(D) All of these

Submitted By: Ali Uppal


What may happen high dV / dt____________?

(A) Unwanted turn ON

(B) Breakdown of J2 junction

(C) Both A and B

(D) Anyone of these

Submitted By: Ali Uppal


Thermal voltage VT can be given by____________?

(A) Kq/T

(B) KT/q

(C) qT/K

(D) (K2/q)(T + 1/T – 1)

Submitted By: Ali Uppal


What happen due to high di / dt____________?

(A) Breakdown of junction

(B) Local hot spot

(C) Insulation failure

(D) None of these

Submitted By: Ali Uppal