Transmission and distribution. part - 2

11. If the insulator of one of the phase conductor fails. It is called

A. Unsymmetrical fault

B. Symmetrical fault

C. Triple line fault

D. Line to line fault

12. The fact that a conductor carries more current on the surface as compared to core, is known as

A. Skin effect

B. Unsymmetrical fault

C. Permeability

D. Corona

13. The chances of corona are maximum during

A. Humid weather

B. Dry weather

C. Summer heat

D. Winter

14. Which among the following represents the precise condition of reciprocity for  transmission parameters?

A. AB – CD = 1

B. AD – BC = 1

C. AC – BD = 1

D. none of the above

15. Transmission efficiency increases as

A. Voltage decreases but power factor increase

B. Voltage increases but power factor decreases

C. Voltage and power factor both decrease

D. Voltage and power factor both increase

16. The skin effect of a conductor will reduce as the

A. Permeability of conductor material increases

B. Diameter increases

C. Frequency increases

D. Resistivity of conductor material increases

17. When alternating current passes through a conductor

A. Portion of conductor near the surface carries more current as compared to the core

B. Portion of conductor near the surface carries less current as compared to the core

C. Entire current passes through the core of the conductor

D. It remains uniformly distributed throughout the section of the conductor

18. The most commonly used insulating material for low and medium voltage cables is

A. porcelain

B. PVC

C. polyethylene

D. vulcanized rubber

19. The bundling of conductor is done primarily to

A. Reduce radio interference

B. Reduce reactance

C. Increase radio interference

D. Increase reactance

20. The power transmitted will be maximum when

A. Corona losses are least

B. Receiving end voltage is more

C. Reactance is high

D. Sending end voltage is more