A. 440 V
B. 11 kV
C. 33 kV
D. 66 kV
Answer: D. 66 kV
C. 33 kV
D. 66 kV
Answer: D. 66 kV
Explanation:
The underground system cannot be operated above 66 kV because of insulation difficulties but an overhead system can be designed for operation up to 400 kV or higher even.