Numerical - Economical value of diameter of single core cable for given stress limit

Q.  What will be the most economical value of diameter of a single core cable to be used on 50 kV, single phase system, when the maximum permissible stress is not exceeding 50 kV / cm?
- Published on 18 Dec 15

a. 2.52 cm
b. 2.828 cm
c. 3.52 cm
d. 3.82 cm

ANSWER: 2.828 cm

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