Electrical Engineering Mcqs

Which of the following is the commonly used type of electromagnets ?

(A) Flat-faced armature type
(B) Horse shoe type
(C) Flat-faced plunger type
(D) All of the above

Submitted By :Ali Uppal

The design of electromagnets is based upon which of the following fundamental equations ?

(A) Force equation
(B) Magnetic circuit equation
(C) Heating equation
(D) Voltage equation
(E) All of the above

Submitted By :Ali Uppal

electromagnets generally function as holding magnets ?

(A) Tractive
(B) Portative
(C) Either of the above
(D) None of the above

Submitted By :Ali Uppal

In D.C. machines the width of the duct is usually_____________?

(A) 4 mm
(B) 6 mm
(C) 8 mm
(D) 10 mm

Submitted By :Ali Uppal

In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?

(A) increase
(B) decrease
(C) either of the above
(D) none of the above

Submitted By :Ali Uppal

Which of the following methods may be adopted to reduce the effects of armature reaction ?

(A) Increase in length of air gap at pole tips
(B) Increasing reluctance of pole tips
(C) Compensating windings
(D) Interpoles
(E) All of the above

Submitted By :Ali Uppal

In D.C. machines the number of slots per pole usually lies___________?

(A) between 2 to 4
(B) between 6 to 8
(C) between 9 to 16
(D) between 20 to 30

Submitted By :Ali Uppal

In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?

(A) 5 percent
(B) 10 percent
(C) 15 percent
(D) 30 percent
(E) none of the above

Submitted By :Ali Uppal

Power transformers have rating_______________?

(A) equal to 50 kVA
(B) equal to 100 kVA
(C) above 200 kVA
(D) none of the above

Submitted By :Ali Uppal

____________are always double layer type?

(A) Closed windings
(B) Open windings
(C) Either of the above
(D) None of the above

Submitted By :Ali Uppal

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