MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 10 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 of the following are applications of singly excited magnetic systems? |
| A. | electromagnets, relays |
| B. | moving-iron instruments |
| C. | reluctance motors |
| D. | all of the mentioned |
| Answer» E. | |
| 2. |
Single phase reluctance motors are extensively used in ________ |
| A. | grinder applications |
| B. | driving electric clocks and other timing devices |
| C. | welding applications |
| D. | lifts/ elevators |
| Answer» C. welding applications | |
| 3. |
The single phase reluctance machine acts as a generator when angle is _______ |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | any of the mentioned |
| Answer» C. zero | |
| 4. |
For a given reluctance motor, Rld and Rlq are ________ |
| A. | constant |
| B. | varying |
| C. | zero |
| D. | all of the mentioned |
| Answer» B. varying | |
| 5. |
For a reluctance motor, the maximum average torque occurs when = __________ |
| A. | 45 |
| B. | 90 |
| C. | 0 |
| D. | 180 |
| Answer» B. 90 | |
| 6. |
The variation of reluctance Rl with space angle r depends on the shape of __________ |
| A. | stator poles |
| B. | rotor poles |
| C. | stator or rotor poles |
| D. | both stator and rotor poles |
| Answer» E. | |
| 7. |
The reluctance offered to the stator flux by two small air gaps in series with high permeability iron, in reluctance machine is minimum, when the space angle r = ___________ |
| A. | 0 |
| B. | 45 |
| C. | 90 |
| D. | 270 |
| Answer» B. 45 | |
| 8. |
The reluctance offered to the stator flux by two very large air gaps in series with high permeability iron, in reluctance machine is maximum, when the space angle r = ___________ |
| A. | 0 |
| B. | 45 |
| C. | 90 |
| D. | 180 |
| Answer» D. 180 | |
| 9. |
Space angle, r is measured between stator d-axis and _______________ |
| A. | quadrature axis |
| B. | direct d-axis |
| C. | long rotor axis |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 10. |
What is the angle between stator direct axis and quadrature axis? |
| A. | 90 |
| B. | 0 |
| C. | 45 |
| D. | 60 |
| Answer» B. 0 | |