Electrical Engineering Mcqs

The switch that has the fastest speed of operation is ____________ switch?

(A) Electronic
(B) Mechanical
(C) Electromechanical
(D) None of the above

Submitted By :Ali Uppal

A relay is ___________switch?

(A) A mechanical
(B) An electronic
(C) An electromechanical
(D) None of the above

Submitted By :Ali Uppal

A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage ?

(A) 8 V
(B) 7 V
(C) 6 V
(D) 2 V

Submitted By :Ali Uppal

In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance ?

(A) 10 O
(B) 50 O
(C) 25 O
(D) 40 O

Submitted By :Ali Uppal

When load current is zero, the Zener current will be_____________?

(A) Zero
(B) Minimum
(C) Maximum
(D) None of the above

Submitted By :Ali Uppal

A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?

(A) 10 O
(B) 20 O
(C) 15 O
(D) 40 O

Submitted By :Ali Uppal

A Zener regulator _____________ in the power supply?

(A) Increases the ripple
(B) Decreases the ripple
(C) Neither increases nor decreases the ripple
(D) Data insufficient

Submitted By :Ali Uppal

The Zener current will be minimum when_____________?

(A) Load current is maximum
(B) Load current is minimum
(C) Load current is zero
(D) None of the above

Submitted By :Ali Uppal

Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?

(A) 15 V
(B) 5 V
(C) 30 V
(D) 45 V

Submitted By :Ali Uppal

If the input a.c. voltage to regulated or ordinary power supply increases by 5% what will be the approximate change in d.c. output voltage?

(A) 10%
(B) 20%
(C) 15%
(D) 5%

Submitted By :Ali Uppal

Previous
First
....
262
263
264
265
266
....
344
Next