Electrical Engineering Mcqs

Which of the following is true about SIT?

(A) SIT is a high power, high frequency device

(B) SIT is a high power, low frequency device

(C) SIT is a high power, high voltage device

(D) SIT is a low power, high frequency device

Submitted By: Ali Uppal


During which time maximum conduction spreading take place in the thyristor during turn ON?

(A) Delay time

(B) Spread time

(C) Rise time

(D) Same for every case

Submitted By: Ali Uppal


A GTO can be turned on by applying___________?

(A) Positive gate signal

(B) Positive drain signal

(C) Positive source signal

(D) None of these

Submitted By: Ali Uppal


Maximum di / dt in a SCR is________?

(A) Directly proportional to Vm of supply voltage

(B) Inversely proportional to Vm of supply voltage

(C) Inversely proportional to L in the circuit

(D) Both A and C

Submitted By: Ali Uppal


Submitted By: Ali Uppal


For series connected SCR’s dynamic equalising circuit consists of___________?

(A) R and C in series but with diode across C

(B) R and C in series but with diode across R

(C) Series R and diode with C across R

(D) Series R and diode with C across R

Submitted By: Ali Uppal


By which one of the following we can measure the reliability of a string_____________?

(A) String efficient

(B) Reliability factor

(C) Factor of safety

(D) Derating factor

Submitted By: Ali Uppal


Anode current in an SCR consists of____________?

(A) holes only

(B) electrons only

(C) either electron or holes

(D) Both electron and holes

Submitted By: Ali Uppal


To meet high current demand we use SCRs in______________?

(A) series connection.

(B) parallel connection.

(C) anti parallel connection.

(D) both B and C.

Submitted By: Ali Uppal


Dynamic equalising circuit is useful____________?

(A) To limit di / dt of SCR

(B) To limit dV / dt of SCR

(C) For voltage equalisation

(D) Both B and C

Submitted By: Ali Uppal