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transmission and distribution MCQs

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

transmission and distribution Mcqs

1. Which of the following D.C. distribution system is the simplest and lowest in first cost ?
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A. Radial system

B. Inter-connected system

C. Ring system

D. None of the above

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

B. triangle

C. catenary

D. semi-circle

3. The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the________________?
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A. none of the above

B. Seeback effect

C. Ferranti effect

D. Raman effect

4. Galvanised steel wire is generally used as______________?
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A. all of the above

B. stay wire

C. earth wire

D. structural components

5. Which of the following materials is used for overhead transmission lines ?
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A. Any of the above

B. Cadmium copper

C. Galvanised steel

D. Steel cored aluminium

6. The use of strain type insulators is made where the conductors are__________?
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A. at intermediate anchor towers

B. any of the above

C. dead ended

D. none of the above

7. Which of the following bus-bar schemes has the lowest cost?
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A. Ring bus-bar scheme

B. Single bus-bar scheme

C. Main and transfer scheme

D. Breaker and a half scheme

8. The material generally used for armour of high voltage cables is_____________?
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A. aluminium

B. brass

C. steel

D. copper

9. Multicore cables generally use________________?
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A. sector-shaped conductors

B. rectangular conductors

C. circular conductors

D. square conductors

E. none of the above

10. Which of the following distribution systems is more reliable?
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A. All are equally reliable

B. Ring main system

C. Radial system

D. Tree system

11. A circuit is disconnected by isolators when____________?
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A. line is on full load

B. line is energized

C. circuit breaker is not open

D. there is no current in the line

12. The angular displacement between two interconnected stations is mainly due to___________?
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A. armature reactance of both alternators

B. reactance of the interconnector

C. synchronous reactance of both the alternators

D. all of the above

13. Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?
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A. Static condenser

B. Booster transformer

C. Synchronous condenser

D. Tap changing transformer

14. The current drawn by the line due to corona losses is___________?
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A. square

B. sinusoidal

C. triangular

D. non-sinusoidal

15. Overhead lines generally use__________________?
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A. all aluminium conductors

B. A.C.S.R. conductors

C. copper conductors

D. none of these

16. The material commonly used for insulation in high voltage cables is_______________?
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A. paper

B. rubber

C. lead

D. none of the above

17. The material commonly used for sheaths of underground cables is______________?
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A. rubber

B. iron

C. copper

D. lead

18. If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as___________________?
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A. Ohms law

B. Faradays law

C. Kelvins law

D. Kirchhoffs law

E. none of the above

19. _______________are the conductors, which connect the consumers terminals to the distribution?
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A. Distributors

B. Service mains

C. Feeders

D. None of the above

20. For an overhead line, the surge impedance is taken as________________?
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A. 20-30 ohms

B. 7080 ohms

C. none of the above

D. 5001000 ohms

E. 100200 ohms

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