Explore topic-wise MCQs in Electrical Machines.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.

1.

WHICH_AMONG_THE_GIVEN_HARMONICS_ARE_CALLED_BELT_HARMONICS??$

A. 5,7,11,13
B. 3,6,9,12
C. 5,6,11,12
D. 7,11,13,15
Answer» D. 7,11,13,15
Discussion
2.

For eliminating nth harmonic from the EMF generated in the phase of a 3-phase alternator, the chording angle should b?

A. n‚àófull pitch
B. (1/n)‚àófull pitch
C. (2/n)‚àófull pitch
D. (3/n)‚àófull pitch
Answer» B. (1/n)‚Äö√Ñ√∂‚àö‚Ć‚àö‚â•full pitch
Discussion
3.

A 6-pole alternator with 36 slots carries a 2-phase distributed winding. Each coil is short pitched by one slot. The winding factor is given by

A. cot15°/3√2
B. cot15°/4
C. cot15°/2√2
D. cot15°/4
Answer» B. cot15¬¨¬®‚Äö√†√ª/4
Discussion
4.

The chording angle for eliminating 5th harmonic should be ____________

A. 30°
B. 34°
C. 36°
D. 35°
Answer» D. 35¬¨¬®‚Äö√†√ª
Discussion
5.

A 3-phase, 4-pole alternator has 48 stator slots carrying a 3-phase distributed winding. Each coil of the winding is short chorded by one slot pitch. The winding factor is given by ______________

A. (cos7.5)/16
B. (cot7.5)/8
C. 1/(8sin7.5)
D. (cot7.5)/16
Answer» C. 1/(8sin7.5)
Discussion
6.

In 48 slot, 4-pole,3 phase alternator, the coil-span is 10. Its distribution and pitch factors are respectively ____________

A. 0.9717,0.966
B. 0.9822, 0.9814
C. 0.9577, 0.9814
D. 0.9577, 0.966
Answer» E.
Discussion
7.

The winding’s for a 3-phase alternator are:

A. 36 slots, 4 poles, span 1 to 8
B. 72 slots, 6 poles, span 1 to 10
C. 96 slots, 4 poles, span 1 to 21
Answer» D.
Discussion