Which of the following insulation is used in cables ?

Related Mcqs:

1. 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

2. 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

3. 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

4. Rubber is most commonly used insulation in cables

   A. Yes
   B. No

5. Low tension cables are generally used up to___________?

   A. 200 V
   B. 500 V
   C. 700 V
   D. 1000 V

6. cables are used for 132 kV lines____________?

   A. High tension
   B. Super tension
   C. Extra high tension
   D. Extra super voltage

7. 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

8. 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

9. The advantage of oil filled cables is_________?

   A. more perfect impregnation
   B. smaller overall size
   C. no ionisation, oxidation and formation of voids
   D. all of the above

10. 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