Electrical Engineering Mcqs

“In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources”. The above statement is associated with:

(A) Thevenin’s theorem
(B) Norton’s theorem
(C) Superposition theorem
(D) None of the above

Submitted By :Ali Uppal

A passive network is one which contains____________?

(A) only variable resistances
(B) only some sources of e.m.f. in it
(C) only two sources of e.m.f. in it
(D) no source of
(E) m.f. in it

Submitted By :Ali Uppal

Which of the following is the passive element?

(A) Capacitance
(B) Ideal current source
(C) Ideal voltage source
(D) All of the above

Submitted By :Ali Uppal

Which of the following is the disadvantage of static capacitor for power factor improvement?

(A) Easily damaged by high voltage
(B) Cannot be repaired
(C) Short service life
(D) All of the above

Submitted By :Ali Uppal

The primary reason for low power factor is supply system is due to installation of____________?

(A) induction motors
(B) synchronous motors
(C) single phase motors
(D) d.c. motors

Submitted By :Ali Uppal

In a load curve the highest point represents______________?

(A) peak demand
(B) average demand
(C) diversified demand
(D) none of the above

Submitted By :Ali Uppal

A power transformer is usually rated in____________?

(A) kW
(B) kVAR
(C) kWh
(D) kVA

Submitted By :Ali Uppal

Generators for peak load plants are usually designed for maximum efficiency at____________?

(A) 25 to 50 percent full load
(B) 50 to 75 percent full load
(C) full load
(D) 25 percent overload

Submitted By :Ali Uppal

For a power plant which of the following constitutes running cost?

(A) Cost of wages
(B) Cost of fuel
(C) Cost of lubricants
(D) All of the above

Submitted By :Ali Uppal

Static capacitors are rated in terms of_____________?

(A) kW
(B) kWh
(C) kVAR
(D) none of the above

Submitted By :Ali Uppal

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