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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 | |