1) Which type of cable is used for underground service connections?
a. Low tension 3 ¼ core cable
b. Low tension 3 ½ core cable
c. Low tension 2 ¼ core cable
d. Low tension 2 ½ core cable
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Answer
Explanation
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ANSWER: Low tension 3 ½ core cable
Explanation:
No explanation is available for this question!
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2) What is the formula to calculate the number of poles required in LT line distribution?
a. Length / Span + 1
b. Length / Span + 10
c. Span / Length + 1
d. Span / Length + 10
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Answer
Explanation
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ANSWER: Length / Span + 1
Explanation:
No explanation is available for this question!
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3) What should be the height of the ‘Roof Pole’?
a. Less than 5m
b. Less than 3m
c. More than 3m
d. More than 10m
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Answer
Explanation
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ANSWER: Less than 3m
Explanation:
No explanation is available for this question!
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4) What is the multiplication factor used for the determination of maximum current carrying capacity of an 11 kV line?
a. 0.88
b. 0.95
c. 0.9
d. 0.8
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Answer
Explanation
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ANSWER: 0.9
Explanation:
No explanation is available for this question!
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5) What should be the minimum clearance for laying power cables near communication lines?
a. 0.2 m horizontally and vertically
b. 0.6 m horizontally and vertically
c. 1 m horizontally and vertically
d. 1.5 m horizontally and vertically
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Answer
Explanation
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ANSWER: 0.6 m horizontally and vertically
Explanation:
No explanation is available for this question!
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6) What should be the minimum depth of trench from the ground level for cables carrying a voltage between 3.3 kV and 11 kV?
a. 0.75 m plus radius of complete cable
b. 0.45 m plus radius of complete cable
c. 1.0 m plus radius of complete cable
d. All of these
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Answer
Explanation
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ANSWER: 0.75 m plus radius of complete cable
Explanation:
No explanation is available for this question!
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7) Which type of stress is developed in a belted type cable construction used for voltage above 22 kV?
a. Radial stress
b. Tangential stress
c. Electrostatic stress
d. Both (A) and (B)
e. All of these
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Answer
Explanation
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ANSWER: Both (A) and (B)
Explanation:
No explanation is available for this question!
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8) What is the dielectric constant of impregnated paper insulation?
a. 3.5
b. 2.5
c. 4.3
d. 3.8
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Answer
Explanation
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ANSWER: 3.5
Explanation:
No explanation is available for this question!
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9) Which among these is the main requirement of the insulating materials?
i. Non inflammable
ii. High permittivity
iii. High dielectric strength
a. i and ii
b. i and iii
c. ii and iii
d. i, ii and iii
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Answer
Explanation
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ANSWER: i and iii
Explanation:
No explanation is available for this question!
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10) Which type of cable does not require bedding?
a. Paper insulated lead covered cables
b. PVC cables
c. Both (A) and (B)
d. None of these
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Answer
Explanation
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ANSWER: PVC cables
Explanation:
No explanation is available for this question!
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