MCQOPTIONS
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MCQOPTIONS
This section includes 19 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. |
Lower values of frequency are used for small machines. |
| A. | true |
| B. | false |
| Answer» C. | |
| 2. |
What is the dependency of the cost of the armature and field windings with respect to large number of poles? |
| A. | high cost for armature windings, low cost for field windings |
| B. | high cost for armature windings, high cost for field windings |
| C. | low cost for armature windings, high cost for field windings |
| D. | low cost for armature windings, low cost for field windings |
| Answer» E. | |
| 3. |
Large number of poles lead to large flashover between brushes. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 4. |
What is the effect of the distortion of field form with respect to the small number of poles? |
| A. | small number of poles cause no distortions |
| B. | small number of poles clears all distortions |
| C. | small number of poles reduces distortions |
| D. | small number of poles increases distortions |
| Answer» E. | |
| 5. |
WHAT_IS_THE_EFFECT_OF_THE_DISTORTION_OF_FIELD_FORM_WITH_RESPECT_TO_THE_SMALL_NUMBER_OF_POLES??$ |
| A. | small number of poles cause no distortions |
| B. | small number of poles clears all distortions |
| C. | small number of poles reduces distortions |
| D. | small number of poles increases distortions |
| Answer» E. | |
| 6. |
What is the dependency of the cost of the armature and field windings with respect to large number of poles?$ |
| A. | high cost for armature windings, low cost for field windings |
| B. | high cost for armature windings, high cost for field windings |
| C. | low cost for armature windings, high cost for field windings |
| D. | low cost for armature windings, low cost for field windings |
| Answer» E. | |
| 7. |
Large_number_of_poles_lead_to_large_flashover_between_brushes?$ |
| A. | true |
| B. | false |
| Answer» B. false | |
| 8. |
What should be the armature mmf per pole for output over 1500 kW? |
| A. | 5000 A |
| B. | 5000-7500 A |
| C. | 7500-10000 A |
| D. | upto 12500 |
| Answer» E. | |
| 9. |
What should be the range of the current per brush arm? |
| A. | limited to 400 A |
| B. | limited to 200 A |
| C. | limited to 100 A |
| D. | limited to 300 A |
| Answer» B. limited to 200 A | |
| 10. |
What is the range of the current per parallel path for the choice of number of poles? |
| A. | limited to 100 A |
| B. | limited to 150 A |
| C. | limited to 200 A |
| D. | limited to 250 A |
| Answer» D. limited to 250 A | |
| 11. |
Lower_values_of_frequency_are_used_for_small_machines? |
| A. | true |
| B. | false |
| Answer» C. | |
| 12. |
What happens to the labor charges when there is an increase in number of poles? |
| A. | labor charges are reduced |
| B. | labor charges are increased |
| C. | labor charges are fixed always |
| D. | labor charges vary |
| Answer» C. labor charges are fixed always | |
| 13. |
What happens to the length of the commutators with the increase in number of poles? |
| A. | The length of commutators are increased |
| B. | The length of commutators are decreased |
| C. | The length of commutators are stable |
| D. | The length of commutators are higher |
| Answer» C. The length of commutators are stable | |
| 14. |
What happens to the weight of copper in both armature and field windings when the number of poles increase? |
| A. | weight of copper in armature winding decreases and weight of copper in field winding increases |
| B. | weight of copper in armature winding increases and weight of copper in field winding decreases |
| C. | weight of copper in armature winding and field winding decreases |
| D. | weight of copper in armature winding and field winding increases |
| Answer» D. weight of copper in armature winding and field winding increases | |
| 15. |
What is the relation of hysteresis loss and weight of iron parts with respect to increase of number of poles? |
| A. | decrease in hysteresis loss, increase in weight |
| B. | decrease in hysteresis loss, decrease in weight |
| C. | increase in hysteresis loss, increase in weight |
| D. | increase in hysteresis loss, decrease in weight |
| Answer» C. increase in hysteresis loss, increase in weight | |
| 16. |
What is the range of frequency during the selection of number of poles? |
| A. | 20-50 Hz |
| B. | 25-40 Hz |
| C. | 25-50 Hz |
| D. | >50 Hz |
| Answer» D. >50 Hz | |
| 17. |
What is the formula for frequency of flux reversals? |
| A. | f = p*n |
| B. | f = p/n |
| C. | f = n/p |
| D. | f = (p*n)/2 |
| Answer» E. | |
| 18. |
How many considerations are present in the selection of number of poles? |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» E. | |
| 19. |
How is the selection of number of poles made in AC and DC machines? |
| A. | any number of poles can be used for both AC and DC machines |
| B. | fixed number of poles in both AC and DC machines |
| C. | fixed number of poles in DC machines and any number of poles in AC machines |
| D. | fixed number of poles in AC machines and any number of poles in DC machines |
| Answer» E. | |