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Electrostatic and Capacitance

Electrostatic and Capacitance
The dielectric constant is the ability of a material to establish an electric field.

1

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Electrostatic and Capacitance
The minimum value of potential gradient in a cable occurs in

outer sheath
uniformly all over
insulation
conductor

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Electrostatic and Capacitance
XC is inversely proportional to frequency and capacitance.

1

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Electrostatic and Capacitance
A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is

92 x 105 V/m
62 x 105 V/m
82 x 105 V/m
72 x 105 V/m

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Electrostatic and Capacitance
Paper capacitors usually have a tolerance of

None of the listed here
± 5%
± 10%
± 15%

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Electrostatic and Capacitance
Paper condenser is

Usually of fixed value
None of the listed here
Electrolytic condenser
Always polarised

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