On which of the following factors skin effect depends?

Related Mcqs:

1. Owing to skin effect:

   A. current flows through the half cross-section of the conductor
   B. portion of the conductor near the surface carries more current and core of the conductor carries less current
   C. portion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent
   D. any of the above
   E. none 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. For aluminium, as compared to copper, all the following factors have higher values except:

   A. specific volume
   B. electrical conductivity
   C. co-efficient of linear expansion
   D. resistance per unit length for same cross-section

4. 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

5. Which of the following characteristics should the line supports for transmission lines possess?

   A. Low cost
   B. High mechanical strength
   C. Longer life
   D. All of the above

6. In a substation the following equipment is not installed?

   A. exciters
   B. series capacitors
   C. shunt reactors
   D. voltatre transformers

7. Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?

   A. Static condenser
   B. Synchronous condenser
   C. Tap changing transformer
   D. Booster transformer

8. The corona is considerably affected by which of the following _______________?

   A. Size of the conductor
   B. Shape of the conductor
   C. Surface condition of the conductor
   D. All of the above

9. Which of the following methods is used for laying of underground cables ?

   A. Direct laying
   B. Draw-in-system
   C. Solid system
   D. All of the above

10. Which of the following is not a constituent for making porcelain insulators ?

    A. Quartz
    B. Kaolin
    C. Felspar
    D. Silica