MCQOPTIONS
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MCQOPTIONS
This section includes 20 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. |
The flux density of the stator core should not exceed 1.3 weber per m2. |
| A. | true |
| B. | false |
| Answer» C. | |
| 2. |
The flux density of the high torque machines is 1.8 weber per m2. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 3. |
What is the relation of the number of slots with the leakage reactance? |
| A. | small number of slots, high leakage reactance |
| B. | large number of slots, high leakage reactance |
| C. | large number of slots, small leakage reactance |
| D. | small number of slots, small leakage reactance |
| Answer» D. small number of slots, small leakage reactance | |
| 4. |
What is the range of the current density for the open type motors split phase, capacitor and repulsion start motors? |
| A. | 4-5 A per mm2 |
| B. | 3-4 A per mm2 |
| C. | 2-4 A per mm2 |
| D. | 1-4 A per mm2 |
| Answer» C. 2-4 A per mm2 | |
| 5. |
How many design data are present in the design of the stator? |
| A. | 6 |
| B. | 7 |
| C. | 8 |
| D. | 9 |
| Answer» D. 9 | |
| 6. |
HOW_MANY_DESIGN_DATA_ARE_PRESENT_IN_THE_DESIGN_OF_THE_STATOR??$ |
| A. | 6 |
| B. | 7 |
| C. | 8 |
| D. | 9 |
| Answer» D. 9 | |
| 7. |
What is the relation of the number of slots with the leakage reactance?$ |
| A. | small number of slots, high leakage reactance |
| B. | large number of slots, high leakage reactance |
| C. | large number of slots, small leakage reactance |
| D. | small number of slots, small leakage reactance |
| Answer» D. small number of slots, small leakage reactance | |
| 8. |
What is the range of the current density for the open type motors split phase, capacitor and repulsion start motors?$ |
| A. | 4-5 A per mm<sup>2</sup> |
| B. | 3-4 A per mm<sup>2</sup> |
| C. | 2-4 A per mm<sup>2</sup> |
| D. | 1-4 A per mm<sup>2</sup> |
| Answer» C. 2-4 A per mm<sup>2</sup> | |
| 9. |
What is the formula for the flux density in stator core? |
| A. | flux density in stator core = maximum flux / length of the iron * depth of stator core |
| B. | flux density in stator core = maximum flux * length of the iron * depth of stator core |
| C. | flux density in stator core = maximum flux / 2 *length of the iron * depth of stator core |
| D. | flux density in stator core = maximum flux * length of the iron / depth of stator core |
| Answer» D. flux density in stator core = maximum flux * length of the iron / depth of stator core | |
| 10. |
The flux density of the stator core should not exceed 1.3 weber per m2? |
| A. | true |
| B. | false |
| Answer» C. | |
| 11. |
The flux density of the high torque machines is 1.8 weber per m2? |
| A. | true |
| B. | false |
| Answer» B. false | |
| 12. |
What is the formula for the area required for the insulated conductors? |
| A. | area required for the insulated conductors = total number of conductors per slot * 0.785 / diameter of insulated conductor2 |
| B. | area required for the insulated conductors = total number of conductors per slot / 0.785 * diameter of insulated conductor2 |
| C. | area required for the insulated conductors = total number of conductors per slot * 0.785 * diameter of insulated conductor2 |
| D. | area required for the insulated conductors = 1/total number of conductors per slot * 0.785 * diameter of insulated conductor2 |
| Answer» D. area required for the insulated conductors = 1/total number of conductors per slot * 0.785 * diameter of insulated conductor2 | |
| 13. |
What is the value of the stator induced voltage with respect to the supply voltage? |
| A. | stator induced voltage = 95% of supply voltage |
| B. | stator induced voltage = 90% of supply voltage |
| C. | stator induced voltage = 85% of supply voltage |
| D. | stator induced voltage = 80% of supply voltage |
| Answer» B. stator induced voltage = 90% of supply voltage | |
| 14. |
What is the formula of the maximum flux in the running winding? |
| A. | maximum flux = flux * pole |
| B. | maximum flux = flux/pole |
| C. | maximum flux = flux / turns |
| D. | maximum flux = flux * turns |
| Answer» C. maximum flux = flux / turns | |
| 15. |
What is the range of the winding factor for the usual windings distribution? |
| A. | 0.70-0.80 |
| B. | 0.75-0.85 |
| C. | 0.70-0.85 |
| D. | 0.70-0.75 |
| Answer» C. 0.70-0.85 | |
| 16. |
What is the formula for the mean pitch factor? |
| A. | mean pitch factor = pitch factor of each coil per pole group + turns in the coil / total number of turns |
| B. | mean pitch factor = pitch factor of each coil per pole group / turns in the coil * total number of turns |
| C. | mean pitch factor = pitch factor of each coil per pole group * turns in the coil * total number of turns |
| D. | mean pitch factor = pitch factor of each coil per pole group * turns in the coil / total number of turns |
| Answer» E. | |
| 17. |
How can the small single phase motor reduce the harmonics still much further? |
| A. | removing the winding |
| B. | insulating the winding |
| C. | grading the winding |
| D. | shading the winding |
| Answer» D. shading the winding | |
| 18. |
How much of the total slots are used for the reduction of the mmf wave harmonics? |
| A. | 60% |
| B. | 65% |
| C. | 70% |
| D. | 80% |
| Answer» D. 80% | |
| 19. |
How many coils are present in the stator windings? |
| A. | 2 |
| B. | 3 |
| C. | 2 or more |
| D. | 3 or more |
| Answer» E. | |
| 20. |
What type is the stator windings of the single phase induction motor? |
| A. | hollow |
| B. | cylindrical |
| C. | concentric |
| D. | rectangular |
| Answer» D. rectangular | |