The presence of ozone due to corona is harmful because it________________? - PakMcqs

Related Mcqs:

1. The current drawn by the line due to corona losses is___________?

   A. non-sinusoidal B. sinusoidal C. triangular D. square...

2. 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...

3. 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...

4. There is a greater possibility of occurence of corona during______________?

   A. dry weather B. winter C. summer heat D. humid weather E. none of the above...

5. A conductor, due to sag between two supports, takes the form of____________?

   A. semi-circle B. triangle C. ellipse D. catenary...

6. The angular displacement between two interconnected stations is mainly due to___________?

   A. armature reactance of both alternators B. reactance of the interconnector C. synchronous reactance of both the alternators D. all of the above...

7. When a conductor carries more current on the surface as compared to core, it is due to___________?

   A. permeability variation B. corona C. skin effect D. unsymmetrical fault E. none of the above...

8. 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...

9. The usual spans with R.C.C. poles are_______________?

   A. 40—50 meters B. 60—100 meters C. 80—100 meters D. 300—500 meters...

10. The voltage of the single phase supply to residential consumers is_____________?

    A. 110 V B. 210 V C. 230 V D. 400 V...