Q11. | The advantage of oil filled cables is | ||||||
A. | more perfect impregnation [Wrong Answer] |
B. | smaller overall size [Wrong Answer] |
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C. | no ionisation, oxidation and formation of voids [Wrong Answer] |
D. | all of the above [Correct Answer] |
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Q12. | Empire tape is | ||||||
A. | varnished cambric [Correct Answer] |
B. | vulcanised rubber [Wrong Answer] |
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C. | impregnated paper [Wrong Answer] |
D. | none of the above [Wrong Answer] |
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Q13. | The minimum dielectric stress in a cable is at |
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A. | armour [Wrong Answer] |
B. | bedding [Wrong Answer] |
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C. | conductor surface [Wrong Answer] |
D. | lead sheath [Correct Answer] |
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Q14. | In capacitance grading of cables we use a ____ dielectric. |
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A. | composite [Correct Answer] |
B. | porous [Wrong Answer] |
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C. | homogeneous [Wrong Answer] |
D. | hygroscopic [Wrong Answer] |
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Q15. | If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be |
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A. | 5 kV/mm [Wrong Answer] |
B. | 10 kV/mm [Correct Answer] |
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C. | 15 kV/mm [Wrong Answer] |
D. | 30 kV/mm [Wrong Answer] |
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Q16. | Underground cables are laid at sufficient depth |
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A. | to minimise temperature stresses [Wrong Answer] |
B. | to avoid being unearthed easily due to removal of soil [Wrong Answer] |
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C. | to minimise the effect of shocks and vibrations due to passing vehicles, etc. [Correct Answer] |
D. | for all of the above reasons [Wrong Answer] |
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Q18. | The thickness of the layer of insulation on the conductor, in cables, depends upon |
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A. | reactive power [Wrong Answer] |
B. | power factor [Wrong Answer] |
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C. | voltage [Correct Answer] |
D. | current carrying capacity [Wrong Answer] |
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Q19. | In single core cables armouring is not done to |
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A. | avoid excessive sheath losses [Correct Answer] |
B. | make it flexible [Wrong Answer] |
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C. | either of the above [Wrong Answer] |
D. | none of the above [Wrong Answer] |
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Q20. | Pressure cables are generally not used beyond |
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A. | 11 kV [Wrong Answer] |
B. | 33 kV [Wrong Answer] |
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C. | 66 kV [Correct Answer] |
D. | 132 kV [Wrong Answer] |
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