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.Management Sciences
Category: Cables
Which of the following protects a cable against mechanical injury___________?
A. Bedding
B. Sheath
C. Armouring
D. None of the above
If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?
A. 5 kV/mm
B. 10 kV/mm
A. 15 kV/mm
D. 30 kV/mm
The intersheaths in the cables are used to_____________?
A. minimize the stress
B. avoid the requirement of good insulation
C. provide proper stress distribution
D. none of the above
The thickness of metallic shielding on cables is usually_______________?
A. 0.04 mm
B. 0.2 to 0.4 mm
E. 3 to 5 mm
D. 40 to 60 mm
The minimum dielectric stress in a cable is at_____________?
A. armour
B. bedding
C. conductor surface
D. lead sheath
The insulation of the cable decreases with__________?
A. the increase in length of the insulation
B. the decrease in the length of the insulation
C. either A. or (b)
D. none of the above
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 14
The breakdown of insulation of the cable can be avoided economically by the use of___________?
A. inter-sheaths
B. insulating materials with different dielectric constants
C. both (A) and (B)
D. none of the above
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