MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Design Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the value of the slot pitch for the low voltage machines? |
| A. | slot pitch < 25 mm |
| B. | slot pitch = 25 mm |
| C. | slot pitch less than equal to 25 mm |
| D. | slot pitch greater than equal to 25 mm |
| Answer» D. slot pitch greater than equal to 25 mm | |
| 2. |
The value of slot pitch depends upon the voltage of the machine. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 3. |
How is the number of armature slots associated with the flux densities in iron? |
| A. | tooth ripples are increased, if the number of slots are increased |
| B. | tooth ripples are decreased, if the number of slots are increased |
| C. | tooth ripples are increased, if the number of slots are decreased |
| D. | tooth ripples are decreased, if the number of slots are decreased |
| Answer» B. tooth ripples are decreased, if the number of slots are increased | |
| 4. |
How is the number of armature slots associated with the tooth ripples? |
| A. | tooth ripples are increased, if the number of slots are increased |
| B. | tooth ripples are decreased, if the number of slots are increased |
| C. | tooth ripples are increased, if the number of slots are decreased |
| D. | tooth ripples are decreased, if the number of slots are decreased |
| Answer» C. tooth ripples are increased, if the number of slots are decreased | |
| 5. |
How is the number of armature slots associated with the leakage reactance? |
| A. | small number of slots leads to less leakage reactance |
| B. | small number of slots leads to high leakage reactance |
| C. | large number of slots leads to high leakage reactance |
| D. | large number of slots leads to low leakage reactance |
| Answer» B. small number of slots leads to high leakage reactance | |
| 6. |
How is the number of armature slots associated with the hotspot temperature? |
| A. | small number of slots leads to less hotspot temperature |
| B. | small number of slots leads to high hotspot temperature |
| C. | large number of slots leads to high hotspot temperature |
| D. | large number of slots leads to low hotspot temperature |
| Answer» C. large number of slots leads to high hotspot temperature | |
| 7. |
How is the number of armature slots associated with the cost factor? |
| A. | small number of slots leads to less cost |
| B. | small number of slots leads to high cost |
| C. | large number of slots leads to high cost |
| D. | large number of slots leads to low cost |
| Answer» B. small number of slots leads to high cost | |
| 8. |
How is the number of armature slots associated with the armature windings? |
| A. | number of slots should be such that unbalanced winding is obtained |
| B. | number of slots should be such that balanced winding is obtained |
| C. | number of slots should be so low as possible |
| D. | number of slots should be high as possible |
| Answer» C. number of slots should be so low as possible | |
| 9. |
How many factors are related in the selection of the armature slots? |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | 4 |
| Answer» C. 7 | |
| 10. |
When is the double layer bar or wave windings made use of? |
| A. | when single turns coils are necessary as with turbo alternators and unipolar low voltage machines |
| B. | when single turns coils are necessary as with turbo alternators and bipolar low voltage machines |
| C. | when single turns coils are necessary as with turbo alternators and multipolar low voltage machines |
| D. | when double turns coils are necessary as with turbo alternators and unipolar low voltage machines |
| Answer» D. when double turns coils are necessary as with turbo alternators and unipolar low voltage machines | |
| 11. |
The single layer windings have higher efficiency and quieter operation because of narrow slot openings. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 12. |
Which among the following makes double layer windings advantageous than the single layer windings? |
| A. | ease in the manufacture of coils and lower cost of winding |
| B. | less number of coils are required as spare in the case of winding repairs |
| C. | fractional slot windings can be employed |
| D. | ease in the manufacture of coils and lower cost of winding, fractional slot windings can be employed, less number of coils are required as spare in the case of winding repairs |
| Answer» E. | |
| 13. |
Which type of machines have a large number of poles per phase? |
| A. | high voltage machines and machines with high value of flux per pole |
| B. | high voltage machines and machines with small value of flux per pole |
| C. | small voltage machines and machines with high value of flux per pole |
| D. | small voltage machines and machines with low value of flux per pole |
| Answer» C. small voltage machines and machines with high value of flux per pole | |
| 14. |
When are the double layer bar windings made use of during the armature design? |
| A. | large values of flux per pole and small number of turns per phase |
| B. | large values of flux per pole and large number of turns per phase |
| C. | small values of flux per pole and small number of turns per phase |
| D. | small values of flux per pole and large number of turns per phase |
| Answer» B. large values of flux per pole and large number of turns per phase | |
| 15. |
How many factors does the design of armature of synchronous machines depend upon? |
| A. | 2 |
| B. | 4 |
| C. | 3 |
| D. | 5 |
| Answer» E. | |