MCQOPTIONS
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MCQOPTIONS
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 | |
| 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 | |
| 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 | |
| 4. |
The chording angle for eliminating 5th harmonic should be ____________ |
| A. | 30° |
| B. | 34° |
| C. | 36° |
| D. | 35° |
| Answer» D. 35¬¨¬®‚Äö√†√ª | |
| 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) | |
| 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. | |
| 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. | |