Power Systems Multiple Choice Questions and Answers - Electrical Engineering MCQ's - Preparation for Engineering.pdf
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3/18/2015
Power Systems Multiple Choice Questions and Answers Electrical Engineering MCQ's Preparation for Engineering
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1. An industrial consumer hall a daily load pattern of 2000 KW, 0.8 lag for 12 Hra and 1000 kW UPF for 1J Hr. The load factor i= _____. (a) 0.5 (b) 0.75 (c) 0.6 (d) 2.0
Ans: c 2. What is the maximum value of a load which consume 500 KWh per day at a load factor of 0.40, if the consumer increases the load factor of 0.50 without increasing the
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maximum demand?
► 2013 (788)
(a) 52.08 kW
▼ 2012 (82)
(b) 50.8 kW (c) 4.5 kW (d) 60 kW
Ans: a 3. A consumer consume. 600 kWh per day at a load factor of 0.40. If the coneumer increases the load factor of 0.70 without increasing the maximum demand, what is the consumption of energy in kWh (a) 950 kWh (b) 1000 kWh (c) 1050 kWh (d) 1100 kWh
Ans: c 4. The yearly load duration curve of a power plant is a straight line. The maximum load is 750 MW and the minimum load is 600 Mw. The capacity of the plant is 900 MW. What is the capacity factor and utilization factor? (a) 0.56,0.80
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(b) 0.83,0.75
Mechanicl Engineering Interview Questions and Answ...
(c) 0.78, 0.9
Power Systems Multiple Choice
(d) 0.75, 0.83
Questions and Answer...
Ans: d
Automobile Engineering MCQs Set6 |
5. What is the utilization factor of a power station which supplies the following loads?
Automobile Engineering MCQs Set5 | Preparation for...
Load A: Motor load of200 kW between 10 AM to7PM Load B : Lighting load of 100 kW between 7 PM to 11 PM
Preparation for...
Load C : Pumping load of 110 kW between 3 PM to 10 AM
Automobile Engineering MCQs Set4 | Preparation for...
(a) 1.60
Automobile Engineering Multiple Choice
(c) 1.00 (b) 1.32 (d) 2.56
Ans: b http://www.engineeringkings.com/2012/11/powersystemsmultiplechoicequestions.html
Questions a... Automobile Engineering Multiple Choice Questions a... Automobile Engineering Multiple Choice
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Power Systems Multiple Choice Questions and Answers Electrical Engineering MCQ's Preparation for Engineering
6. A power station supplies the peak load of 60 Mw, 40 MW and 70 MW to three localities. The annual load factor is 0.50 p.u. and the diversity factor of the load at the station is 1.55. The maximum demand on the station and average load respectively
Questions a... Automobile Engineering Multiple Choice Questions a...
will be
► October (55)
(a) 120 MW, 60.8
► September (1)
(b) 90 MW, 50.6 (c) 103.2 MW, 51.61 (d) 100 MW, 0.51
Ans: c 7. The load duration curve for a system, is shown in the figure below. The load factor will be
(a) 0.83 (b) 0.96 (c) 0.67 (d) 0.50
Ans: a 8. A generating station has a maximum demand of 50 Mw, a load factor of 60%, a plant capacity factor of 45% and if the plant while running as per schedule, were fully loaded. The daily energy produced will be (a) 400 MW (b) 720 MW (c) 500 MW (d) 600 MW Ans: b 9. A generating st ation has a maximum, demand of 20 mW, load factor of 60%, a plant capacity factor of 50% and a plant Use factor of 72%. What is the reserve capacity of the plant, if the plant, while running as per schedule, were fully loaded? (a) 10 MW (b) 15 MW (c) 2 MW (d) 5 MW Ans: d 10. In the above question, the maximum energy that could be produced daily is (a) 500 MWhlday (b) 360 MWhIday (c) 600 MWhlday (d) 720 MWhlday Ans: a 11. In a DC transmission line (a) it is necessary for the sending end and receiving end to be operated in synchronism. (b) the effects of inductive and capacitive reactances are greater than in an AC transmission line of the same rating. (c) there are no effects due to inductive and capacitive reactances.
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Power Systems Multiple Choice Questions and Answers Electrical Engineering MCQ's Preparation for Engineering
(d) power transfer capability is limited by stability considerations. Ans: c 12. The impedance of a circuit is given by z=3+j4. Its conductance will be (a) 1/3 (b) 3/5 (c) 3/25 (d) 4/5 Ans: c 13. A 100 km transmiesion line ia deaigned for a nominal voltage of 132 kV and conaiala of one conductor per phase. The line reactance is 0.726 ohm/km. The static transmission capacity of the line, in Megawatts, would be (a) 132 (b) 240 (c) 416 (d) 720 Ans: c 14. The per unit impedance ofa circuit element is 0.15. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be (a) 0.075 (b) 0.15 (c) 0.30 (d) 0.600 Ans: c 15. The conductor of a 10 km long, single phase, two wire line are separated by a distance of 1.5 m. The diameter of each conductor is 1 cm, If the conductors are of copper, the inductance of the circuit is (a) 50.0 mH (b) 45.3 mH (c) 23.8 mH (d) 19.6 mH Ans: c 16. For a single phase overhead line having solid copper conductors of diameter 1 cm, spaced 60 cm between centers, the inductance in mH/km is (a) 0.05 + 0.2 ln 60 (b) 0.2 ln 60 (c) 0.05 + 0.2 ln (6010.5) (d) 0.2 ln (60/0.5) Ans: c 17. A 100 km long transmission line is loaded at 110 kV.if the loss of line is 5 MW and the load is 150 MVA, the resistance of the line is (a) 8.06 ohms per phase (b) 0.806 ohms per phase (c) 0.0806 ohms per phase (d) 80.6 ohms per phase Ans: a 18. A 3phase, 11 kv, 50 Hz, 200 kW load has a power factor of 0.8 lag. A delta connected 3phase capacitor is used to improve the power factor to unity. The capacitance perphase of the capacitor in microfarads is (a) 3.948 (b) 1.316 (c) 0.439
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Power Systems Multiple Choice Questions and Answers Electrical Engineering MCQ's Preparation for Engineering
(d) 11.844 Ans: b 19. For equilateral spacing of conductors of an untrasposed 3phase line, we have (a) balanced receiving end voltage and no communication interference (b) unbalanced receiving end voltage and no communication interference (c) balanced receiving end voltage and communication interference (d) unbalanced receiving end voltage and communication interference. Ans: c 20. For a 500 Hz frequency excitation, a 50 #em long power line will be modelled as (a) short line (b) medium line (c) long line (d) data insufficient for decision Ans: c 21. Which one of the following statement. is not correct for the use of bundled conductors in transmission lines? (a) Control of voltage gradient (b) Reduction in corona 1088 (c) Reduction in radio interference (d) Increase in interference with communication lines Ans: d 22. The main consideration for higher and higher operating voltage of transmission is to (a) increase the efficiency of transmission (b) reduce power losses (c) increase power transmission capability (d) both (a) and (b) above Ans: c 23. A single phaae transmisson line of impedance j 0.8 ohm supplies a resistive load of 500 A at 300 V. The sending end power factor is (a) unity (b) 0.8 lagging (c) 0.8 leading (d) 0.6 lagging Ans: d 24. A medium line with parameters A, B, C, D is extended by connecting a short line of impedance Z in series The overall ABCD parameteres of the series combinatton will be (a) A, AZ, C + D/Z, D (b) A, AZ + B, C, CZ + D (c) A + BZ, B, C + DZ, D (d) AZ, B, C/Z, D Ans: b 25. When bundle conductors are used in place of single conductors, the effective inductance and capacitance will respectively (a) increase and decrease (b) decrease and increase (c) decrease and remain unaffected (d) remain unaffected and increase Ans: c 26. To increase the visual critical voltage of cporona for an overhead line, one solid phase
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conductor is replaced by a "bundle" of four smaller conductors per phase, having an aggregate crosssectional area equal to that of the solid conductor. If the radius of the solid conductor is 40 mm, then the radius of each of the bundle conductors would be (a) 10 mm (b) 20 mm (c) 28.2 mm (d) 30 mm Ans: d 27. For an existing ac transmision line, the string efficiency is 80%, if dc voltage is supplied for the same set up, the string efficiency will be (a)
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