If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?

Related Mcqs:

1. 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

2. The minimum dielectric stress in a cable is at_____________?

   A. armour
   B. bedding
   C. conductor surface
   D. lead sheath

3. In capacitance grading a homogeneous dielectric is used

   A. Yes
   B. No

4. 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

5. 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

6. 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

7. 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

8. In a cable, the maximum stress under operating conditions is at___________?

   A. insulation layer
   B. sheath
   C. armour
   D. conductor surface

9. In a cable the voltage stress is maximum at____________?

   A. sheath
   B. insulator
   E. surface of the conductor
   D. core of the conductor

10. Dielectric strength of rubber is around____________?

    A. 5 kV/mm
    B. 15 kV/mm
    C. 30 kV/mm
    D. 200 kV/mm