Which of the following insulation is used in cables ?
Which of the following insulation is used in cables ?
A. Varnished cambric
B. Rubber
C. Paper
D. Any of the above
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The relative permittivity of rubber is____________?
The relative permittivity of rubber is____________?A. between 2 and 3
B. between 5 and 6
C. between 8 and 10
D. between 12 and 14Underground cables are laid at sufficient depth___________?
Underground cables are laid at sufficient depth___________?A. to minimise temperature stresses
B. to avoid being unearthed easily due to removal of soil
C. to minimize the effect of shocks and vibrations due to gassing vehicles, etc
D. for all of the above reasonsLow tension cables are generally used up to___________?
Low tension cables are generally used up to___________?A. 200 V
B. 500 V
C. 700 V
D. 1000 VIn 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 conductorThe material for armouring on cable is usually__________?
The material for armouring on cable is usually__________?A. steel tape
B. galvanised steel wire
C. any of the above
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 above