Pressure cables are generally not used beyond__________?
Pressure cables are generally not used beyond__________?
A. 11 kV
B. 33 kV
C. 66 kV
D. 132 kV
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Polyethylene has very poor dielectric and ageing properties
Polyethylene has very poor dielectric and ageing propertiesA. Yes
B. NoConduit pipes are normally used to protect _______ cables
Conduit pipes are normally used to protect _______ cablesA. unsheathed cables
B. armoured
C. PVC sheathed cables
D. all of the aboveA 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 aboveThe disadvantage with paper as insulating material is____________?
The disadvantage with paper as insulating material is____________?A. it is hygroscopic
B. it has high capacitance
C. it is an organic material
D. none of the aboveThe electrostatic stress in underground cables is_________?
The electrostatic stress in underground cables is_________?A. same at the conductor and the sheath
B. minimum at the conductor and maximum at the sheath
C. maximum at the conductor and minimum at the sheath
D. zero at the conductor as well as on the sheath
E. none of the aboveSolid type cables are considered unreliable beyond 66 kV because___________?
Solid type cables are considered unreliable beyond 66 kV because___________?A. insulation may melt due to higher temperature
B. skin effect dominates on the conductor
C. of corona loss between conductor and sheath material
D. there is a danger of breakdown of insulation due to the presence of voids