Electrical Engineering Mcqs

IGBT combines the advantages of_____________?

(A) BJTs and SITs

(B) BJTs and MOSFETs

(C) SITs and MOSFETs

(D) None of these

Submitted By: Ali Uppal


Which of the following is used in SCR to protect from high dV / dt__________________?

(A) Snubber circuit

(B) Fuse

(C) Equalizing circuit

(D) Circuit breaker

Submitted By: Ali Uppal


Submitted By: Ali Uppal


What is used to protect a thyristor from high di / dt conditions__________?

(A) Fuse.

(B) Snubber circuit

(C) Inductor

(D) Voltage clamping device

Submitted By: Ali Uppal


SITH is also known as___________?

(A) Filled controlled diode

(B) Filled controlled rectifier

(C) Silicon controlled rectifier

(D) None of these

Submitted By: Ali Uppal


The typical time of rising time lies between______________?

(A) 10 – 20 µs

(B) 40 – 60 µs

(C) 1 – 4 µs

(D) 90 – 100 µs

Submitted By: Ali Uppal


Submitted By: Ali Uppal


Maximum power loss occurs during_________________?

(A) delay time

(B) rise time

(C) spread time

(D) all

Submitted By: Ali Uppal


Spread time is defined as the interval during which_____________?

(A) anode voltage drops from 10 % of its initial value to zero

(B) anode current rises from 90 % to its final value

(C) both (A) and (B)

(D) anode current rises from 10 % to 90 % of its final value

Submitted By: Ali Uppal


The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will___________?

(A) Turn on

(B) Not turn on

(C) Turn on if inductance is removed

(D) Turn on if pulse frequency us increased to two times

Submitted By: Ali Uppal