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Electrical Cables

Electrical Cables
In capacitance grading of cables we use a _________ dielectric.

Homogeneous
Porous
Composite
Hygroscopic

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Electrical Cables
Low tension cables are generally used up to

1000 V
600 V
400 V
200 V

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Electrical Cables
The surge resistance of cable is

100 ohms
50 ohms
500 ohms
5 ohms

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Electrical Cables
A cable carrying alternating current has

Hysteresis, leakage and copper losses only
Hysteresis and leakage losses only
Hysteresis losses only
Hysteresis, leakage, copper and friction losses

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Electrical Cables
If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be

5 kV/mm
30 kV/mm
15 kV/mm
10 kV/mm

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Electrical Cables
Underground cables are laid at sufficient depth

All of the listed here
To minimize temperature stresses
To minimize the effect of shocks and vibrations due to gassing vehicles, etc.
To avoid being unearthed easily due to removal of soil

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