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

Related Mcqs:

1. Underground cables are laid at sufficient depth___________?

   A. to minimise temperature stresses
   B. to avoid being unearthed easily due to removal of soil
   C. to minimize the effect of shocks and vibrations due to gassing vehicles, etc
   D. for all of the above reasons

2. The electrostatic stress in underground cables is_________?

   A. same at the conductor and the sheath
   B. minimum at the conductor and maximum at the sheath
   C. maximum at the conductor and minimum at the sheath
   D. zero at the conductor as well as on the sheath
   E. none of the above

3. Low tension cables are generally used up to___________?

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

4. cables are used for 132 kV lines____________?

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

5. The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to__________?

   A. absence of harmonics
   B. non-existence of any stability limit
   C. smaller dielectric loss
   D. absence of ripples
   E. none of the above

6. High tension cables are generally used up to_____________?

   A. 11kV
   B. 33kV
   C. 66 kV
   D. 132 kV

7. Pressure cables are generally not used beyond__________?

   A. 11 kV
   B. 33 kV
   C. 66 kV
   D. 132 kV

8. In the cables, sheaths are used to___________?

   A. prevent the moisture from entering the cable
   B. provide enough strength
   E. provide proper insulation
   D. none of the above

9. Rubber is most commonly used insulation in cables

   A. Yes
   B. No

10. 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