Electrical Engineering Mcqs

Power amplifiers handle ______________ signals compare to voltage amplifiers?

(A) Small
(B) Very small
(C) Large
(D) None of the above

Submitted By :Ali Uppal

The maximum efficiency of transformer coupled class A power amplifier is _______________?

(A) 30%
(B) 50%
(C) 80%
(D) 45%

Submitted By :Ali Uppal

In class A operation, the operating point is generally located_____________of the d.c. load line?

(A) At cut off point
(B) At the middle
(C) At saturation point
(D) None of the above

Submitted By :Ali Uppal

What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?

(A) 2
(B) 7
(C) 3
(D) None of the above

Submitted By :Ali Uppal

For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?

(A) 10 W
(B) 4 W
(C) 8 W
(D) None of the above

Submitted By :Ali Uppal

The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?

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

Submitted By :Ali Uppal

The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ?

(A) 20 W
(B) 40 W
(C) 10 W
(D) 80 W

Submitted By :Ali Uppal

Power amplifiers generally use transformer coupling because transformer permits______________?

(A) Cooling of the circuit
(B) Impedance matching
(C) Distortionless output
(D) Good frequency response

Submitted By :Ali Uppal

The most important consideration in power amplifier is __________________?

(A) Biasing the circuit
(B) Collector efficiency
(C) To keep the transformer cool
(D) None of the above

Submitted By :Ali Uppal

A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?

(A) 5 kO
(B) 20 kO
(C) 100 kO
(D) 10 kO

Submitted By :Ali Uppal

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