Discussion
The extra super voltage cables are manufactured to operate beyond ______ voltage level.
Answer: D
Cables are classed by the voltage they are made for: low voltage cables are up to 1 kV, high tension cables up to 11 kV, super tension cables up to 33 kV, extra high tension cables up to 66 kV and extra super voltage cables beyond 132 kV, as the key gives. So extra super voltage cables are made to operate beyond 132 kV, option (D). The values of 11 kV, 33 kV and 66 kV are the upper limits of the lower classes of cables.
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