The metallic sheath may be made of lead or lead alloy or of aluminium ?

Related Mcqs:

1. In a cable immediately above metallic sheath ______ is provided

   A. earthing connection
   B. bedding
   C. armouring
   D. none of the above

2. 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

3. The insulating material for a cable should have__________?

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

4. 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

5. The surge resistance of cable is__________?

   A. 5 ohms
   B. 20 ohms
   C. 50 ohms
   D. 100 ohms

6. Pressure cables are generally not used beyond__________?

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

7. 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

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. The insulating material should have____________?

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

10. 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