The disadvantage with paper as insulating material is____________?

Related Mcqs:

1. The insulating material for a cable should have__________?

   A. low cost
   B. high dielectric strength
   C. high mechanical strength
   D. all of the above

2. The insulating material for cables should____________?

   A. be acid proof
   B. be non-inflammable
   C. be non-hygroscopic
   D. have all above properties

3. The insulating material should have____________?

   A. low permittivity
   B. high resistivity
   C. high dielectric strength
   D. all of the above

4. 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

5. 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

6. 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

7. Cables, generally used beyond 66 kV are___________?

   A. oil filled
   B. S.L. type
   C. belted
   D. armoured

8. Solid type cables are considered unreliable beyond 66 kV because___________?

   A. insulation may melt due to higher temperature
   B. skin effect dominates on the conductor
   C. of corona loss between conductor and sheath material
   D. there is a danger of breakdown of insulation due to the presence of voids

9. In congested areas where excavation is expensive and inconvenient ‘draw in system’ of laying of underground cables is often adopted

   A. Yes
   B. No

10. 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