Owing to skin effect:

Related Mcqs:

1. On which of the following factors skin effect depends?

   A. Frequency of the current
   B. Size of the conductor
   C. Resistivity of the conductor material
   D. All of the above

2. The skin effect of a conductor will reduce as the__________?

   A. resistivity of conductor material increases
   B. permeability of conductor material increases
   C. diameter increases
   D. frequency increases

3. The effect of corona can be detected by___________?

   A. presence of ozone detected by odour
   B. hissing sound
   C. faint luminous glow of bluish colour
   D. all of the above

4. The steel used in steel cored conductors is usually__________?

   A. alloy steel
   B. stainless steel
   C. mild steel
   D. high speed steel
   E. all of the above

5. The voltage drop, for constant voltage transmission is compensated by installing__________?

   A. inductors
   B. capacitors
   C. synchronous motors
   D. all of above
   E. none of the above

6. For transmission of power over a distance of 200 km, the transmission voltage should be_________kv?

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

7. When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?

   A. Current will flow to earth
   B. Supply voltage will drop
   C. Supply voltage will increase
   D. No current will flow in the conductor
   E. None of the above

8. Galvanised steel wire is generally used as______________?

   A. stay wire
   B. earth wire
   C. structural components
   D. all of the above

9. A booster is a_________________?

   A. series wound generator
   B. shunt wound generator
   C. synchronous generator
   D. none of the above

10. The material generally used for armour of high voltage cables is_____________?

    A. aluminium
    B. steel
    C. brass
    D. copper