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

COOLMOS device can be used in application up to power range of___________?

(A) 1 KVA
(B) 2 KVA
(C) 500 VA
(D) 100 KVA

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

The reverse recovery time of diode is trr = 3 ÃŽÂ¼s and the rate off all of the diode current is di/dt = 30 A/ÃŽÂ¼s. The storage charge current QRR is___________?

(A) 130 ÃŽÂ¼s
(B) 135 ÃŽÂ¼s
(C) 140 ÃŽÂ¼s
(D) 145 ÃŽÂ¼s

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

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