QUESTION ANSWER ,MCQ OF POWER SYSTEM,RRB,SSE,PSC,AE,JE,Power system part 1_25 Most Important MCQ OF Power System _Objective Type Question answer of Power system ,competitive exams VIVA Questions, Electrical Engineering
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The document contains a series of multiple-choice questions (MCQs) related to power systems, covering topics such as transmission methods, conductor types, and voltage classifications. Each question is followed by possible answers, with the correct one indicated. The content appears to serve as a study aid for individuals preparing for exams in electrical engineering or related fields.
QUESTION ANSWER ,MCQ OF POWER SYSTEM,RRB,SSE,PSC,AE,JE,Power system part 1_25 Most Important MCQ OF Power System _Objective Type Question answer of Power system ,competitive exams VIVA Questions, Electrical Engineering
- 2. POWER SYSTEM 1. By which of the following systems electric power may be transmitted ? (a) Overhead system (b) Underground system (c) Both (a) and (b) (d) None of the above Ans: c
- 3. POWER SYSTEM 2 are the conductors, which connect the consumer's terminals to the distribution (a) Distributors (b) Service mains (c) Feeders (d) None of the above Ans: b
- 4. POWER SYSTEM 3. The underground system cannot be operated above (a) 440 V (b) 11 kV (c) 33 kV (d) 66 kV Ans: d
- 5. POWER SYSTEM 4. Overhead system can be designed for operation upto (a) 11 kV (b) 33 kV (c) 66 kV (d) 400 kV Ans: c
- 6. POWER SYSTEM 5. 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 (a) Kelvin's law (b) Ohm's law (c) Kirchhoffs law (d) Faraday's law
- 7. POWER SYSTEM 6. The wooden poles well impregnated with creosite oil or any preservative compound have life (a) from 2 to 5 years (b) 10 to 15 years (c) 25 to 30 years (d) 60 to 70 years Ans: c
- 8. POWER SYSTEM 7. Which of the following materials is not used for transmission and distribution of electrical power ? (a) Copper (b) Aluminium (c) Steel (d) Tungsten Ans: d
- 9. POWER SYSTEM 8. Galvanized steel wire is generally used as (a) stay wire (b) earth wire (c) structural components (d) all of the above Ans: d
- 10. POWER SYSTEM 9. The usual spans with R.C.C. poles are (a) 40—50 metres (b) 60—100 metres (c) 80—100 metres (d) 300—500 metres Ans: c
- 11. POWER SYSTEM 10. 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 Ans: d
- 12. POWER SYSTEM 11. Which of the following are the constants of the transmission lines ? (a) Resistance (b) Inductance (c) Capacitance (d) All of the above Ans: d
- 13. POWER SYSTEM 12. 310 km line is considered as (a)a long line (b) a medium line (c) a short line (d) any of the above Ans: a
- 14. POWER SYSTEM 13. The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the (a) Seeback effect (b) Ferranti effect (c) Raman effect (d) none of the above Ans: b
- 15. POWER SYSTEM 15. Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b)Availability of steady voltage at all loads at the line terminals (c) Possibility of better protection for the line due to possible use of higher terminal reactances (d) Improvement of power factor at times of moderate and heavy loads Ans: a
- 16. POWER SYSTEM 17. The operating voltage of high voltage cables is upto (a)1.1kV (b)3.3kV (c)6.6kV (d)11kV Ans: d
- 17. POWER SYSTEM 18. The operating voltage of supertension cables is upto (a) 3.3 kV (b) 6.6 kV (c) 11 kV (d) 33 kV Ans: d
- 18. POWER SYSTEM 19. The operating voltage of extra high tension cables is upto (a) 6.6 kV (b) 11 kV (c) 33 kV (d) 66 kV (e) 132 kV Ans: d
- 19. POWER SYSTEM 20. 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 Ans: d
- 20. POWER SYSTEM 21. Which of the following is the source of heat generation in the cables ? (a) Dielectric losses in cable insulation (b) losses in the conductor (c) Losses in the metallic sheathings and armourings (d) All of the above Ans:
- 21. POWER SYSTEM 22. Due to which of the following reasons the cables should not be operated too hot ? (a) The oil may loose its viscosity and it may start drawing off from higher levels (b) Expansion of the oil may cause the sheath to burst (c) Unequal expansion may create voids in the insulation which will lead to ionization (d) The thermal instability may rise due to the rapid increase of dielectric losses with temperature (e) All of the above Ans: e
- 22. POWER SYSTEM 23. Which of the following D.C. distribution system is the simplest and lowest in first cost ? (a) Radial system (b) Ring system (c) Inter- connected system (d) None of the above Ans: a
- 23. POWER SYSTEM 24. A booster is a (a) series wound generator (b) shunt wound generator (c) synchronous generator (d) none of the above Ans: a
- 24. POWER SYSTEM 25. Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system ? (a) Circulating current method (b) Thevenin's theorem (c) Superposition of currents (d) Direct application of Kirehhoffs laws (e) All of the above Ans: e