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1. |
A single core cable is graded by using three dielectrics with relative permittivity 5,4,3 respectively. The diameter of the conductor is 2cm and the overall diameter is 8 cm. If the three dielectric work at the same maximum stress of 40kV/cm, then the safe working rms voltage of cable is ______ kV |
A. | 57.72 |
B. | 81.63 |
C. | 84.67 |
D. | 71.63 |
Answer» B. 81.63 | |