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.Management Sciences
Category: Cables
The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to__________?
A. absence of harmonics
B. non-existence of any stability limit
C. smaller dielectric loss
D. absence of ripples
E. none of the above
In single core cables armouring is not done to________?
A. avoid excessive sheath losses
B. make it flexible
C. either of the above
D. none of the above
The bedding on a cable consists of____________?
A. hessian cloth
B. jute
C. any of the above
D. none of the above
Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ____________?
A. Polyvinyle chloride
B. Vulcanised rubber
C. Impregnated paper
D. Compressed SFe gas
E. none of the above
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 reasons
In case of three core flexible cable the colour of the neutral is_________?
A. blue
B. black
C. brown
D. none of the above
Which of the following insulation is used in cables ?
A. Varnished cambric
B. Rubber
C. Paper
D. Any of the above
Dielectric strength of rubber is around____________?
A. 5 kV/mm
B. 15 kV/mm
C. 30 kV/mm
D. 200 kV/mm
The insulating material for a cable should have__________?
A. low cost
B. high dielectric strength
C. high mechanical strength
D. all of the above
The advantage of cables over overhead transmission lines is___________?
A. easy maintenance
B. low cost
C. can be used in congested areas
D. can be used in high voltage circuits
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