MCQOPTIONS
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MCQOPTIONS
This section includes 18 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. |
What is the range of the ratio of the total cross section of rotor bars to the total stator copper section for main winding for aluminium? |
| A. | 1-1.3 |
| B. | 1-1.4 |
| C. | 1-1.6 |
| D. | 1.2-1.5 |
| Answer» D. 1.2-1.5 | |
| 2. |
What is the formula of the end ring current? |
| A. | end ring current = number of rotor slots * bar current * 3.14 * number of poles |
| B. | end ring current = number of rotor slots * bar current * 3.14 / number of poles |
| C. | end ring current = number of rotor slots / bar current * 3.14 * number of poles |
| D. | end ring current = number of rotor slots * bar current / 3.14 * number of poles |
| Answer» E. | |
| 3. |
What is the range of the ratio of the total cross section of rotor bars to the total stator copper section for main winding for copper? |
| A. | 0.4-0.8 |
| B. | 0.3-0.7 |
| C. | 0.5-0.8 |
| D. | 0.8-0.9 |
| Answer» D. 0.8-0.9 | |
| 4. |
WHAT_IS_THE_RANGE_OF_THE_RATIO_OF_THE_TOTAL_CROSS_SECTION_OF_ROTOR_BARS_TO_THE_TOTAL_STATOR_COPPER_SECTION_FOR_MAIN_WINDING_FOR_COPPER??$ |
| A. | 0.4-0.8 |
| B. | 0.3-0.7 |
| C. | 0.5-0.8 |
| D. | 0.8-0.9 |
| Answer» D. 0.8-0.9 | |
| 5. |
What is the range of the ratio of the total cross section of rotor bars to the total stator copper section for main winding for aluminium?$ |
| A. | 1-1.3 |
| B. | 1-1.4 |
| C. | 1-1.6 |
| D. | 1.2-1.5 |
| Answer» D. 1.2-1.5 | |
| 6. |
What_is_the_formula_of_the_end_ring_current?$ |
| A. | end ring current = number of rotor slots * bar current * 3.14 * number of poles |
| B. | end ring current = number of rotor slots * bar current * 3.14 / number of poles |
| C. | end ring current = number of rotor slots / bar current * 3.14 * number of poles |
| D. | end ring current = number of rotor slots * bar current / 3.14 * number of poles |
| Answer» E. | |
| 7. |
What is the range for the ratio of the resistance to reactance in the split phase motors? |
| A. | 0.40-0.55 |
| B. | 0.45-0.55 |
| C. | 0.45-0.8 |
| D. | 0.45-0.6 |
| Answer» C. 0.45-0.8 | |
| 8. |
What is the formula of the rotor teeth flux density? |
| A. | flux density of rotor teeth = maximum flux / (number of rotor slots / number of poles) * length of the teeth * depth of rotor core |
| B. | flux density of rotor teeth = maximum flux * (number of rotor slots / number of poles) * length of the teeth * depth of rotor core |
| C. | flux density of rotor teeth = 1/maximum flux * (number of rotor slots / number of poles) * length of the teeth * depth of rotor core |
| D. | flux density of rotor teeth = maximum flux / (number of rotor slots * number of poles) * length of the teeth * depth of rotor core |
| Answer» B. flux density of rotor teeth = maximum flux * (number of rotor slots / number of poles) * length of the teeth * depth of rotor core | |
| 9. |
What is the formula of the area of each end ring? |
| A. | area of each end ring = 0.32 * total cross section of rotor bars * number of poles |
| B. | area of each end ring = 0.32 / total cross section of rotor bars * number of poles |
| C. | area of each end ring = 0.32 * total cross section of rotor bars / number of poles |
| D. | area of each end ring = 1/0.32 * total cross section of rotor bars * number of poles |
| Answer» D. area of each end ring = 1/0.32 * total cross section of rotor bars * number of poles | |
| 10. |
What_is_the_formula_for_the_area_of_each_bar? |
| A. | area of each bar = current through each bar / current density through each bar |
| B. | area of each bar = current through each bar * current density through each bar |
| C. | area of each bar = current density through each bar / current through each bar |
| D. | area of each bar = current density through each bar * current through each bar |
| Answer» B. area of each bar = current through each bar * current density through each bar | |
| 11. |
What is the formula for the total cross section of rotor bars? |
| A. | total cross section of rotor bars = number of rotor slots * area of each bar |
| B. | total cross section of rotor bars = number of rotor slots / area of each bar |
| C. | total cross section of rotor bars = number of rotor slots + area of each bar |
| D. | total cross section of rotor bars = number of rotor slots – area of each bar |
| Answer» B. total cross section of rotor bars = number of rotor slots / area of each bar | |
| 12. |
What is the formula for the total stator copper section for main winding? |
| A. | total stator copper section for main winding = number of turns in the running winding * area of the running winding conductor |
| B. | total stator copper section for main winding = 2 * number of turns in the running winding * area of the running winding conductor |
| C. | total stator copper section for main winding = number of turns in the running winding / area of the running winding conductor |
| D. | total stator copper section for main winding = 2* number of turns in the running winding / area of the running winding conductor |
| Answer» C. total stator copper section for main winding = number of turns in the running winding / area of the running winding conductor | |
| 13. |
What among the following are considered for the selection of number of rotor slots? |
| A. | magnetic locking |
| B. | cusps |
| C. | magnetic locking or cusps |
| D. | magnetic locking and cusps |
| Answer» E. | |
| 14. |
Which condition satisfies the quiet operation in machines? |
| A. | number of stator slots is divisible by number of pairs of poles |
| B. | number of rotor slots differs from the number of stator slots by more than the number of poles |
| C. | number of rotor slots is not divisible by number of pairs of poles |
| D. | number of stator slots differs from the number of rotor slots by more than the number of poles |
| Answer» C. number of rotor slots is not divisible by number of pairs of poles | |
| 15. |
What factors are used fixing the number of stator slots? |
| A. | winding arrangement |
| B. | number of poles |
| C. | winding arrangement or number of poles |
| D. | winding arrangement and number of poles |
| Answer» E. | |
| 16. |
What is the formula for the harmonic poles due to slots? |
| A. | harmonic poles due to slots = 2 * (number of slots ± number of poles / 2) |
| B. | harmonic poles due to slots = 2 / (number of slots ± number of poles / 2) |
| C. | harmonic poles due to slots = 2 * (number of slots ± number of poles * 2) |
| D. | harmonic poles due to slots = 1/ 2 * (number of slots ± number of poles / 2) |
| Answer» B. harmonic poles due to slots = 2 / (number of slots ¬¨¬®¬¨¬± number of poles / 2) | |
| 17. |
What is the main motive while choosing the number of rotor slots? |
| A. | increasing the efficiency |
| B. | decreasing the losses |
| C. | no noise is produced |
| D. | high output is produced |
| Answer» D. high output is produced | |
| 18. |
How many design steps are available for the design of rotor? |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | 8 |
| Answer» C. 7 | |