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 relationship between the number of steps to the area of circumscribing circle? |
| A. | number of steps is directly proportional to the area of the circumscribing circle |
| B. | number of steps is indirectly proportional to the area of the circumscribing circle |
| C. | number of steps is directly proportional to square of the area of the circumscribing circle |
| D. | number of steps is indirectly proportional to square of the area of the circumscribing circle |
| Answer» B. number of steps is indirectly proportional to the area of the circumscribing circle | |
| 2. |
What is the net core area for three stepped transformers? |
| A. | 0.45 |
| B. | 0.56 |
| C. | 0.6 |
| D. | 0.62 |
| Answer» D. 0.62 | |
| 3. |
What is the value of ratio of gross core area to the area of circumscribing circle in stepped cores? |
| A. | 0.71 |
| B. | 0.79 |
| C. | 0.89 |
| D. | 0.91 |
| Answer» C. 0.89 | |
| 4. |
The laminations are manufactured in standard size to minimize the wastage of steel during punching of laminations. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 5. |
What is the ratio of the net core area to the area of the circumscribing circle in square cores? |
| A. | 0.58 |
| B. | 0.64 |
| C. | 0.70 |
| D. | 0.80 |
| Answer» B. 0.64 | |
| 6. |
Circular coils are preferred because of their electrical characteristics. |
| A. | true |
| B. | false |
| Answer» C. | |
| 7. |
When is square and stepped cores used? |
| A. | when circular coils are required for low voltage distribution |
| B. | when rectangular coils are required for low voltage distribution |
| C. | when circular coils are required for high voltage distribution |
| D. | when rectangular coils are required for high voltage distribution |
| Answer» D. when rectangular coils are required for high voltage distribution | |
| 8. |
What is the range of the ratio of depth to width of core in rectangular core? |
| A. | 1-2 |
| B. | 1.5-2.5 |
| C. | 1.4-2 |
| D. | 1.5-2 |
| Answer» D. 1.5-2 | |
| 9. |
What type of core section is used for shell type transformer? |
| A. | rectangular |
| B. | square |
| C. | stepped |
| D. | cruciform |
| Answer» B. square | |
| 10. |
How many types of cores are available for core type of transformer? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 11. |
What happens if the utilization factor gets improved? |
| A. | core area increases and the volt/turns decreases |
| B. | core area increases and the volt/turns increases |
| C. | core area decreases and the volt/turn decreases |
| D. | core area decreases and the volt/turn increases |
| Answer» C. core area decreases and the volt/turn decreases | |
| 12. |
What is the optimum number of steps for small and large transformers? |
| A. | 5, 10 |
| B. | 10, 15 |
| C. | 6, 15 |
| D. | 1, 10 |
| Answer» D. 1, 10 | |
| 13. |
What is the relationship between utilization factor and the number of core steps? |
| A. | utilization factor is directly proportional to the number of core steps |
| B. | utilization factor is indirectly proportional to the number of core steps |
| C. | utilization factor is indirectly proportional to the square of number of core steps |
| D. | utilization factor is directly proportional to the square of number of core steps |
| Answer» B. utilization factor is indirectly proportional to the number of core steps | |
| 14. |
What is utilization factor? |
| A. | utilization factor= cross sectional area + gross area of the core |
| B. | utilization factor= cross sectional area – gross area of the core |
| C. | utilization factor= cross sectional area * gross area of the core |
| D. | utilization factor= cross sectional area / gross area of the core |
| Answer» E. | |
| 15. |
What is stacking factor? |
| A. | the allowance made for the power loss |
| B. | the allowance made for the space loss between laminations |
| C. | the allowance made for the heat loss between laminations |
| D. | the allowance made for the power loss between laminations |
| Answer» C. the allowance made for the heat loss between laminations | |