transmission and distribution MCQs – Page 2

Practise focused transmission and distribution questions with marked answers for exam preparation and subject revision.

transmission and distribution Mcqs
21. Which of the following is the demerit of a constant voltage transmission system ?
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A. Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission

B. Increase of short-circuit current of the system

C. Availability of steady voltage at all loads at the line terminals

D. Improvement of power factor at times of moderate and heavy loads

E. Possibility of better protection for the line due to possible use of higher terminal reactants

22. Which of the following is usually not the generating voltage ?
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A. 13.2 kV

B. 11 kV

C. 8.8 kV

D. 6.6 kV

23. Which of the following characteristics should the line supports for transmission lines possess?
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A. All of the above

B. High mechanical strength

C. Low cost

D. Longer life

24. When the interconnector between two stations has large reactance?
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A. none of the above

B. the transfer of power will take place with voltage fluctuation and noise

C. the stations will fall out of step because of large angular displacement between the stations

D. the transfer of power will take place with least loss

25. Which of the following is not a constituent for making porcelain insulators ?
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A. Kaolin

B. Quartz

C. Felspar

D. Silica
26. The minimum clearance between the ground and a 220 kV line is about_________________?
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A. 4.3 m

B. 10.5 m

C. 5.5 m

D. 7.0 m
27. As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only__________________?
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A. 31.25 percent of copper

B. 66.7 percent of copper

C. 125 percent of copper

D. 33.3 percent of copper

28. In the analysis of which of the following lines shunt capacitance is neglected?
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A. Medium as well as long transmission lines

B. Short transmission lines

C. Long transmission lines

D. Medium transmission lines

29. Which of the following methods is used for laying of underground cables ?
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A. Solid system

B. All of the above

C. Draw-in-system

D. Direct laying

30. The skin effect of a conductor will reduce as the__________?
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A. permeability of conductor material increases

B. diameter increases

C. resistivity of conductor material increases

D. frequency increases

31. For aluminium, as compared to copper, all the following factors have higher values except:
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A. electrical conductivity

B. specific volume

C. resistance per unit length for same cross-section

D. co-efficient of linear expansion

32. By which of the following methods string efficiency can be improved?
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A. None of the above

B. Using a guard ring

C. Using long cross arm

D. Grading the insulator

E. Any of the above
33. Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system ?
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A. Circulating current method

B. Thevenins theorem

C. All of the above

D. Superposition of currents

E. Direct application of Kirehhoffs laws

34. Pin type insulators are generally not used for voltages beyond_________?
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A. 22 kV

B. 33 kV

C. 1 kV

D. 11 kV

35. The loads on distributors systems are generally__________________?
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A. none of the above

B. either of the above

C. unbalanced

D. balanced

36. The operating voltage of high voltage cables is up to_______________?
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A. llkV

B. 6.6kV

C. 3.3kV

D. l.lkV

37. In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?
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A. no insulation is required

B. varnish

C. bitumen

D. insulin

38. The frequency of voltage generated, in case of generators, can be increased by___________?
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A. using reactors

B. none of the above

C. reducing the terminal voltage

D. adjusting the governor

E. increasing the load

39. The voltage drop, for constant voltage transmission is compensated by installing__________?
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A. capacitors

B. synchronous motors

C. all of above

D. inductors

E. none of the above

40. When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?
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A. None of the above

B. Supply voltage will increase

C. No current will flow in the conductor

D. Current will flow to earth

E. Supply voltage will drop