MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Power Systems knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
‘Dancing’ of overhead conductors occurs during which of the following types of vibrations? |
| A. | Aeoline vibrations |
| B. | Galloping vibrations |
| C. | Aeoline and Galloping |
| D. | Amplitude vibrations |
| Answer» C. Aeoline and Galloping | |
| 2. |
Which of the following vibrations causes different conductors to touch due to high swing? |
| A. | Aeoline vibrations |
| B. | Galloping vibrations |
| C. | Aeoline and Galloping |
| D. | Amplitude vibrations |
| Answer» C. Aeoline and Galloping | |
| 3. |
What are galloping vibrations in overhead transmission line conductors? |
| A. | High frequency and low amplitude vibrations |
| B. | High frequency and high amplitude vibrations |
| C. | Low frequency and low amplitude vibrations |
| D. | Low frequency and high amplitude vibrations |
| Answer» E. | |
| 4. |
When the sag exceeds 10% of the span length, the shape made by the conductor is similar to which of the following shape? |
| A. | Hyperbola |
| B. | Parabola |
| C. | Catenary |
| D. | Straight line |
| Answer» D. Straight line | |
| 5. |
WHAT_ARE_GALLOPING_VIBRATIONS_IN_OVERHEAD_TRANSMISSION_LINE_CONDUCTORS??$ |
| A. | High frequency and low amplitude vibrations |
| B. | High frequency and high amplitude vibrations |
| C. | Low frequency and low amplitude vibrations |
| D. | Low frequency and high amplitude vibrations |
| Answer» E. | |
| 6. |
‘Dancing’ of overhead conductors occurs during which of the following types of vibrations?$# |
| A. | Aeoline vibrations |
| B. | Galloping vibrations |
| C. | Aeoline and Galloping |
| D. | Amplitude vibrations |
| Answer» C. Aeoline and Galloping | |
| 7. |
Which of the following vibrations causes different conductors to touch due to high swing?$ |
| A. | Aeoline vibrations |
| B. | Galloping vibrations |
| C. | Aeoline and Galloping |
| D. | Amplitude vibrations |
| Answer» C. Aeoline and Galloping | |
| 8. |
What are the methods used to protect conductors against high frequency resonant vibrations? |
| A. | Horizontal conductor configuration |
| B. | Vertical conductor configuration |
| C. | By using dampers |
| D. | There is no method for prevention of such vibrations |
| Answer» D. There is no method for prevention of such vibrations | |
| 9. |
What are the method for prevention of low frequency high amplitude vibrations? |
| A. | Horizontal conductor configuration |
| B. | Vertical conductor configuration |
| C. | Horizontal and Vertical conductor configuration |
| D. | There is no method for prevention of such vibrations |
| Answer» E. | |
| 10. |
What are aeoline vibrations in overhead transmission line conductors? |
| A. | High frequency and low amplitude vibrations |
| B. | High frequency and high amplitude vibrations |
| C. | Low frequency and low amplitude vibrations |
| D. | Low frequency and high amplitude vibrations |
| Answer» B. High frequency and high amplitude vibrations | |
| 11. |
When the sag exceeds 10% of the span length, the shape made by the conductor is similar to which of the following shape? |
| A. | Hyperbola |
| B. | Parabola |
| C. | Catenary |
| D. | Straight line |
| Answer» D. Straight line | |
| 12. |
What is the value of working stress in overhead conductors? |
| A. | Less than ultimate stress |
| B. | More than ultimate stress |
| C. | Always equal to ultimate stress |
| D. | Should be zero |
| Answer» B. More than ultimate stress | |
| 13. |
An overhead transmission line has a span of 220 metres the conductor waiting 0.604 kg/m. What will be the maximum sag if the working tension is 2879 kg. |
| A. | 8.96 m |
| B. | 8.86 m |
| C. | 8.85 m |
| D. | 1.27 m |
| Answer» E. | |
| 14. |
What should be the value of sag for proper operation of overhead transmission line? |
| A. | High |
| B. | Low |
| C. | Nither too low nor too high |
| D. | Anything |
| Answer» D. Anything | |
| 15. |
What is the relation between length of span and sag? |
| A. | sag ‚àù ‚àöspan |
| B. | sag ‚àù (1/span) |
| C. | sac ‚àù span<sup>2</sup> |
| D. | Sagar ‚àù span<sup>3</sup> |
| Answer» D. Sagar ‚Äö√Ñ√∂‚àö‚Ć‚àöœÄ span<sup>3</sup> | |
| 16. |
What is the effect of rise in temperature on sag when Ice and wind effect are eliminated? |
| A. | Sag decreases |
| B. | Sag increases |
| C. | Sag remains constant |
| D. | Sag becomes zero |
| Answer» C. Sag remains constant | |
| 17. |
What happens to the tension in a conductor hanged between two poles, when temperature varies? |
| A. | Tension increases with increase in temperature |
| B. | Tension decreases with increase in temperature |
| C. | Tension first increases and decreases with decrease in temperature |
| D. | Tension in conductor is independent of temperature variation |
| Answer» C. Tension first increases and decreases with decrease in temperature | |