MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Slip ring motor is preferred over squirrel cage induction motor where___________? |
| A. | High starting torque is required |
| B. | Load torque is heavy |
| C. | Heavy pull out torque is required |
| D. | All of the above |
| Answer» B. Load torque is heavy | |
| 2. |
Temperature of the stator winding of a three phase induction motor is obtained by___________? |
| A. | Resistance rise method |
| B. | Thermometer method |
| C. | Embedded temperature method |
| D. | All above methods |
| Answer» E. | |
| 3. |
The term cogging is associated with___________? |
| A. | Three phase transformers |
| B. | Compound generators |
| C. | D.C. series motors |
| D. | Induction motors |
| Answer» E. | |
| 4. |
The crawling in an induction motor is caused by___________? |
| A. | High loads |
| B. | Low voltage supply |
| C. | Improper design of machine |
| D. | Harmonics developed in the motor |
| Answer» E. | |
| 5. |
Stepless speed control of induction motor is possible by which of the following methods ? |
| A. | E.m.f. injection in rotor eueuit |
| B. | Changing the number of poles |
| C. | Cascade operation |
| D. | None of the above |
| Answer» C. Cascade operation | |
| 6. |
Star-delta starting of motors is not possible in case of____________? |
| A. | Single phase motors |
| B. | Variable speed motors |
| C. | Low horse power motors |
| D. | High speed motors |
| Answer» B. Variable speed motors | |
| 7. |
Slip rings are usually made of___________? |
| A. | Copper |
| B. | Carbon |
| C. | Phospor bronze |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 8. |
Short-circuit test on an induction motor cannot be used to determine___________? |
| A. | Windage losses |
| B. | Copper losses |
| C. | Transformation ratio |
| D. | Power scale of circle diagram |
| Answer» B. Copper losses | |
| 9. |
Slip ring motor is recommended where____________? |
| A. | Speed control is required |
| B. | Frequent starting, stopping and reversing is required |
| C. | High starting torque is needed |
| D. | All above features are required |
| Answer» E. | |
| 10. |
Size of a high speed motor as compared to low speed motor for the same H.P. will be__________? |
| A. | Bigger |
| B. | Smaller |
| C. | Same |
| D. | Any of the above |
| Answer» C. Same | |
| 11. |
Slip of an induction motor is negative when_____________? |
| A. | Magnetic field and rotor rotate in opposite direction |
| B. | Rotor speed is less than the synchronous speed of the field and are in the same direction |
| C. | Rotor speed is more than the synchronous speed of the field and are in the same direction |
| D. | None of the above |
| Answer» D. None of the above | |
| 12. |
The cogging of an induction motor can be avoided by____________? |
| A. | Proper ventilation |
| B. | Using DOL starter |
| C. | Auto-transformer starter |
| D. | Having number of rotor slots more or less than the number of stator slots (not equal) |
| Answer» E. | |