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. |
How many steel brackets are used along with the support to steel rings? |
| A. | 5 |
| B. | 7 |
| C. | 4-6 |
| D. | 5-9 |
| Answer» D. 5-9 | |
| 2. |
What should be done to the conductors in the overhang of the stator? |
| A. | bracing |
| B. | shaving |
| C. | punching |
| D. | compressing |
| Answer» B. shaving | |
| 3. |
What happens to the electromagnetic forces during the sudden short circuits at the line terminals? |
| A. | the electromagnetic forces get increased by 250 times the force under normal full load condition |
| B. | the electromagnetic forces get decreased by 250 times the force under normal full load condition |
| C. | the electromagnetic forces get increased by 200 times the force under normal full load condition |
| D. | the electromagnetic forces get decreased by 200 times the force under normal full load condition |
| Answer» B. the electromagnetic forces get decreased by 250 times the force under normal full load condition | |
| 4. |
What happens to the current in the windings during the sudden short circuits at the line terminals? |
| A. | the current reduces to 15 times the full load current |
| B. | the current increases to 15 times the full load current |
| C. | the current reduces to 10 times the full load current |
| D. | the current increases to 10 times the full load current |
| Answer» C. the current reduces to 10 times the full load current | |
| 5. |
What is the main advantage of a winding with multi-turns coils? |
| A. | reduce the choosing of the value of stator slots |
| B. | allows greater flexibility in selecting the value of stator slots |
| C. | increases the flexibility in selecting the number of stator slots |
| D. | has no effect on the number of stator slots |
| Answer» C. increases the flexibility in selecting the number of stator slots | |
| 6. |
The capacity of the pull out machines used for making the coils limits the pole pitch to less than 0.8 m. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 7. |
What among the following is the advantages of the star connection? |
| A. | eliminates single frequency harmonics |
| B. | eliminates double frequency harmonics |
| C. | eliminates triple frequency harmonics |
| D. | eliminates sinusoidal harmonics |
| Answer» D. eliminates sinusoidal harmonics | |
| 8. |
How are the stator windings of all synchronous generator connected? |
| A. | star-delta connection |
| B. | star connection |
| C. | star connection with neutral earthed |
| D. | delta connected |
| Answer» D. delta connected | |
| 9. |
What is the range of the outside diameter of the stator frame of the large hydro-generator? |
| A. | 3-18 m |
| B. | 2-18 m |
| C. | 3.5-18 m |
| D. | 4-18 m |
| Answer» D. 4-18 m | |
| 10. |
What is the thickness of the most commonly used grade for stator laminations? |
| A. | 0.5 mm |
| B. | 1 mm |
| C. | 1.5 mm |
| D. | 2 mm |
| Answer» B. 1 mm | |
| 11. |
The modern synchronous machines make use of non-directional cold rolled steel. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 12. |
Why is the stator core built up of laminations? |
| A. | to reduce core loss |
| B. | to reduce copper loss |
| C. | to reduce iron loss |
| D. | to reduce eddy current loss |
| Answer» E. | |
| 13. |
What factors does the speed of the machines depend upon? |
| A. | head |
| B. | blades |
| C. | type of turbine used |
| D. | head and type of turbine used |
| Answer» E. | |
| 14. |
Which factor does the constructional feature of the hydro-generators depend on? |
| A. | speed |
| B. | voltage |
| C. | power |
| D. | current |
| Answer» B. voltage | |
| 15. |
How many factors are involved in the construction of hydro-generators? |
| A. | 11 |
| B. | 10 |
| C. | 9 |
| D. | 8 |
| Answer» C. 9 | |