It is difficult to maintain oil filled cables____________?
It is difficult to maintain oil filled cables____________?
A. Yes
B. No
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A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?A. one half
B. double
C. four times
D. none of the aboveIn capacitance grading a homogeneous dielectric is used
In capacitance grading a homogeneous dielectric is usedA. Yes
B. NoNatural rubber is obtained from milky sap of tropical trees
Natural rubber is obtained from milky sap of tropical treesA. Yes
B. NoDielectric strength of rubber is around____________?
Dielectric strength of rubber is around____________?A. 5 kV/mm
B. 15 kV/mm
C. 30 kV/mm
D. 200 kV/mmPolyethylene has very poor dielectric and ageing properties
Polyethylene has very poor dielectric and ageing propertiesA. Yes
B. NoIn a cable the voltage stress is maximum at____________?
In a cable the voltage stress is maximum at____________?A. sheath
B. insulator
E. surface of the conductor
D. core of the conductor