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
Related Mcqs:
- 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 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 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 - 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 - If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________?
A. 2 cm
B. 10 cm
C. 50 cm
D. 400 cm - Which of the following insulation is used in cables ?
A. Varnished cambric
B. Rubber
C. Paper
D. Any of the above - The thickness of the layer of insulation on the conductor, in cables, depends upon___________?
A. reactive power
B. power factor
C. voltage
D. current carrying capacity - Rubber is most commonly used insulation in cables
A. Yes
B. No - In a cable, the maximum stress under operating conditions is at___________?
A. insulation layer
B. sheath
C. armour
D. conductor surface - The material for armouring on cable is usually__________?
A. steel tape
B. galvanised steel wire
C. any of the above
D. none of the above
