MCQOPTIONS
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MCQOPTIONS
This section includes 35 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. |
Core of electromagnets are made up of ____________ |
| A. | Diamagnetic Material |
| B. | Paramagnetic Material |
| C. | Ferromagnetic Material |
| D. | Plastic |
| Answer» D. Plastic | |
| 2. |
If the relative permeability of material lies between zero and one, the material is ____________ |
| A. | Diamagnetic Material |
| B. | Paramagnetic Material |
| C. | Ferromagnetic Material |
| D. | Insufficient Information |
| Answer» B. Paramagnetic Material | |
| 3. |
If the magnetic meridian of a certain place, the horizontal component of the earth’s magnetic field is 0.26 G and the dip angle is 60°, what is the magnetic field of earth at this location? |
| A. | 0.52 G |
| B. | 0.46 G |
| C. | 0.78 G |
| D. | 0.94 G |
| Answer» B. 0.46 G | |
| 4. |
The earth’s magnetic field at the equator is approximately 0.4 G. What is the earth’s dipole moment? |
| A. | 0.8 X 1023 Am2 |
| B. | 1.0 X 1023 Am2 |
| C. | 1.2 X 1023 Am2 |
| D. | 1.5 X 1023 Am2 |
| Answer» C. 1.2 X 1023 Am2 | |
| 5. |
If for a material, the magnetization is 8 X 105 A/m and the relative permeability is 200, what is the Magnetic Intensity? |
| A. | 4.89 X 103 A/m |
| B. | 4.64 X 103 A/m |
| C. | 4.43 X 103 A/m |
| D. | 4.02 X 103 A/m |
| Answer» E. | |
| 6. |
Which material is shown in the figure? |
| A. | Diamagnetic Material |
| B. | Paramagnetic Material |
| C. | Ferromagnetic Material |
| D. | Non-Magnetic Material |
| Answer» B. Paramagnetic Material | |
| 7. |
A solenoid has a core of a material with relative permeability 400. The windings are insulated from the core and the magnetic Intensity is 1500 A/m. What is the Magnetization of the core? |
| A. | 0.25 T |
| B. | 0.50 T |
| C. | 0.75 T |
| D. | 1.00 T |
| Answer» D. 1.00 T | |
| 8. |
A solenoid carry a current of 2A. If the number of turns is 1000 per meter, what is the Magnetic Intensity? |
| A. | 1000 A/m |
| B. | 2000 A/m |
| C. | 3000 A/m |
| D. | 4000 A/m |
| Answer» C. 3000 A/m | |
| 9. |
For a paramagnetic material, χ does not depend on Temperature. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
The dimensions of χ are ____________ |
| A. | [AL] |
| B. | [AL2T-1] |
| C. | [AM2L4T] |
| D. | Dimensionless |
| Answer» E. | |
| 11. |
How is the magnetic field, B, related to Magnetization, M? |
| A. | B ∝ M |
| B. | B ∝ 1/M |
| C. | B ∝ M2 |
| D. | B ∝ 1/M2 |
| Answer» B. B ∝ 1/M | |
| 12. |
In case of diamagnetic materials, M and H are opposite in direction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
Where would the declination be greater? |
| A. | India |
| B. | Africa |
| C. | Egypt |
| D. | Arctic |
| Answer» E. | |
| 14. |
The vertical plane containing the earth’s axis of rotation is called as _____________ |
| A. | Geographic meridian |
| B. | Magnetic Meridian |
| C. | Magnetic Declination |
| D. | Prime Meridian |
| Answer» B. Magnetic Meridian | |
| 15. |
If a material is paramagnetic, what shall be the value of χ? |
| A. | Negative |
| B. | Small and positive |
| C. | Large and Positive |
| D. | Depends on other factors |
| Answer» C. Large and Positive | |
| 16. |
The magnetizing reactance is directly proportional to the saturation factor. |
| A. | true |
| B. | false |
| Answer» C. | |
| 17. |
What is the value of the stator slot leakage factor? |
| A. | 0.9 |
| B. | 0.80 |
| C. | 0.95 |
| D. | 0.85 |
| Answer» D. 0.85 | |
| 18. |
What is the formula for the rotor bar skew angle? |
| A. | rotor bar skew angle = 3.14 / rotor slot pitches through which bars are skewed * (no of rotor slots / number of poles) |
| B. | rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed * (no of rotor slots * number of poles) |
| C. | rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed / (no of rotor slots * number of poles) |
| D. | rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed / (no of rotor slots / number of poles) |
| Answer» E. | |
| 19. |
What is the relation of the stator slot leakage factor with the skew leakage reactance? |
| A. | skew leakage reactance is directly proportional to the stator slot leakage factor |
| B. | skew leakage reactance is indirectly proportional to the stator slot leakage factor |
| C. | skew leakage reactance is directly proportional to the square of stator slot leakage factor |
| D. | skew leakage reactance is indirectly proportional to the square of stator slot leakage factor |
| Answer» B. skew leakage reactance is indirectly proportional to the stator slot leakage factor | |
| 20. |
WHAT_IS_THE_RELATION_OF_THE_STATOR_SLOT_LEAKAGE_FACTOR_WITH_THE_SKEW_LEAKAGE_REACTANCE??$ |
| A. | skew leakage reactance is directly proportional to the stator slot leakage factor |
| B. | skew leakage reactance is indirectly proportional to the stator slot leakage factor |
| C. | skew leakage reactance is directly proportional to the square of stator slot leakage factor |
| D. | skew leakage reactance is indirectly proportional to the square of stator slot leakage factor |
| Answer» B. skew leakage reactance is indirectly proportional to the stator slot leakage factor | |
| 21. |
What is the value of the stator slot leakage factor?$ |
| A. | 0.90 |
| B. | 0.80 |
| C. | 0.95 |
| D. | 0.85 |
| Answer» D. 0.85 | |
| 22. |
What_is_the_formula_for_the_rotor_bar_skew_angle?$ |
| A. | rotor bar skew angle = 3.14 / rotor slot pitches through which bars are skewed * (no of rotor slots / number of poles) |
| B. | rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed * (no of rotor slots * number of poles) |
| C. | rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed / (no of rotor slots * number of poles) |
| D. | rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed / (no of rotor slots / number of poles) |
| Answer» E. | |
| 23. |
What is the output equation of a single phase induction motor developed by P.H Tricky? |
| A. | diameter<sup>2</sup> * length = 16.5 / H.P * output coefficient * frequency constant * motor type constants * rpm * 10<sup>6</sup> |
| B. | diameter<sup>2</sup> * length = 16.5 * H.P * output coefficient * frequency constant * motor type constants /rpm * 10<sup>6</sup> |
| C. | diameter<sup>2</sup> * length = 16.5 * H.P / output coefficient * frequency constant * motor type constants * rpm * 10<sup>6</sup> |
| D. | diameter<sup>2</sup> * length = 16.5 * H.P * output coefficient / frequency constant * motor type constants * rpm * 10<sup>6</sup> |
| Answer» C. diameter<sup>2</sup> * length = 16.5 * H.P / output coefficient * frequency constant * motor type constants * rpm * 10<sup>6</sup> | |
| 24. |
What factor is the core length made equal to in theoretical conditions? |
| A. | pole length |
| B. | pole proportion |
| C. | pole length |
| D. | number of poles |
| Answer» D. number of poles | |
| 25. |
What is the formula of the saturation factor? |
| A. | saturation factor = total mmf required for magnetic circuit * mmf required for air gap |
| B. | saturation factor = total mmf required for magnetic circuit – mmf required for air gap |
| C. | saturation factor = total mmf required for magnetic circuit / mmf required for air gap |
| D. | saturation factor = total mmf required for magnetic circuit + mmf required for air gap |
| Answer» D. saturation factor = total mmf required for magnetic circuit + mmf required for air gap | |
| 26. |
The magnetizing reactance is directly proportional to the saturation factor? |
| A. | true |
| B. | false |
| Answer» C. | |
| 27. |
What is the relation between pole pitch and the magnetizing reactance? |
| A. | magnetizing reactance is directly proportional to the square of the pole pitch |
| B. | magnetizing reactance is directly proportional to the pole pitch |
| C. | magnetizing reactance is indirectly proportional to the pole pitch |
| D. | magnetizing reactance is indirectly proportional to the square of the pole pitch |
| Answer» C. magnetizing reactance is indirectly proportional to the pole pitch | |
| 28. |
What is the relation of the overhang leakage reactance with the average coil span in slots? |
| A. | overhang leakage reactance is directly proportional to the square of the average coil span in slots |
| B. | overhang leakage reactance is indirectly proportional to the square of the average coil span in slots |
| C. | overhang leakage reactance is directly proportional to the average coil span in slots |
| D. | overhang leakage reactance is indirectly proportional to the average coil span in slots |
| Answer» D. overhang leakage reactance is indirectly proportional to the average coil span in slots | |
| 29. |
What is the relation of the zigzag reactance with the specific permeance for zigzag leakage? |
| A. | zigzag reactance is directly proportional to the specific permeance for zigzag leakage |
| B. | zigzag reactance is indirectly proportional to the specific permeance for zigzag leakage |
| C. | zigzag reactance is directly proportional to the square of the specific permeance for zigzag leakage |
| D. | zigzag reactance is indirectly proportional to the square of the specific permeance for zigzag leakage |
| Answer» B. zigzag reactance is indirectly proportional to the specific permeance for zigzag leakage | |
| 30. |
What is the relation between slot leakage reactance and specific slot permeance? |
| A. | slot leakage reactance is directly proportional to the specific slot permeance |
| B. | slot leakage reactance is indirectly proportional to the specific slot permeance |
| C. | slot leakage reactance is directly proportional to the square of the specific slot permeance |
| D. | slot leakage reactance is indirectly proportional to the square of the specific slot permeance |
| Answer» B. slot leakage reactance is indirectly proportional to the specific slot permeance | |
| 31. |
What is the relation of the total slot leakage reactance with number of stator slots? |
| A. | slot leakage reactance is directly proportional to the number of stator slots |
| B. | slot leakage reactance is indirectly proportional to the number of stator slots |
| C. | slot leakage reactance is directly proportional to the square of the number of stator slots |
| D. | slot leakage reactance is indirectly proportional to the square of the number of stator slots |
| Answer» C. slot leakage reactance is directly proportional to the square of the number of stator slots | |
| 32. |
How is the winding arrangement and how is the conductors in each slot? |
| A. | circular winding and same conductors in each slot |
| B. | circular winding and different conductor in each slot |
| C. | concentric winding and same conductor in each slot |
| D. | concentric winding and different conductor in each slot |
| Answer» E. | |
| 33. |
How many parameters are present under the leakage reactance calculations? |
| A. | 6 |
| B. | 5 |
| C. | 7 |
| D. | 4 |
| Answer» D. 4 | |
| 34. |
How many parameters are present in the single phase induction motor? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 35. |
What is the formula for the resistance of running winding? |
| A. | resistance of running winding = 0.021 * no of turns in running winding * length of mean turns of running winding * area of running winding conductor |
| B. | resistance of running winding = 0.021 / no of turns in running winding * length of mean turns of running winding * area of running winding conductor |
| C. | resistance of running winding = 0.021 * no of turns in running winding / length of mean turns of running winding * area of running winding conductor |
| D. | resistance of running winding = 0.021 * no of turns in running winding * length of mean turns of running winding / area of running winding conductor |
| Answer» E. | |