The underground system cannot be operated above_________________?
Correct answer: D. 66 kV
- A. 440 V
- B. 11 kV
- C. 33 kV
- D. 66 kV
Explanation
In conventional power-system comparisons, underground cables are generally considered uneconomical and difficult to operate above about 66 kV because insulation, heat dissipation and installation costs rise sharply. Hence 66 kV is the intended upper limit.
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