Code No.310252 III/IV B.Tech (I Semester) Examination, Nov. 2002. POWER SYSTEMS – I (Electrical and Electronics Engineering)
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Max. Marks: 70 Answer any Five questions All question carry equal marks --Discuss the factors governing the choice of site for a hydro-station. Calculate the available continuous power of a hydro-electric station from the following data: Catchment area = 15 Sq.km; Annual rainfall = 1,250 m: Effective head = 300 m: Yield factor to allow runoff and loss by evaporation = 50%: Efficiency of plant = 80% Load factor = 35.4%: What should be the ratings of generators installed?
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Time: 3 Hrs.
Describe the schematic arrangement of a thermal power station and explain. What is the function of air preheaters in a steam power plant? Where are they located?
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3 a) Discuss about various turbines used in hydro-electric power plants. b) Give a typical heat flow diagram for any coal-fired steam power plant indicating approximately the various percentage losses from coal input stage to output end at bus bars. 4 a) b)
Why is shielding necessary for reactors? Explain various methods in use. With a neat diagram, explain the working of a nuclear power plant.
5 a) b)
What is chain reaction? How it is controlled in a nuclear reactor? Explain a typical layout of an indoor sub-station
6 a)
List out the various bus bar schemes. Explain about sectionalized single bus-bar scheme. Find the most economical cross-section of a 3-core distributor cable 250 m long supplying a load of 80 k-w at 400 volts and 0.8 p.f lagging for 4,000 hours per annum and open circuited for the remainder of the year. The cost of the cable including installation is Rs. (15a+25) per metre where ‘a’ is the area of each conductor in Sq.cm. Interest and depreciation total 10 percent and cost of energy wasted is 10 paise per unit. The resistance per Km of 1Cm 2 cross section. conductor is 0.173 ohm.
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7 a)
Explain the following terms 1) Load factor 3) Maximum demand 5) Utilisation factor
2) 4)
Capacity factor Plant factor
Code No.310252
Estimate the generating cost per unit delivered at the station, given the following data: Capacity of the plant installed = 50 MW Annual load factor = 40% Capital Cost = Rs. 3 x 106 Annual cost of fuel, oil, taxation, wages and salaries = Rs. 4 x 106 Interest rate =5%: Rate of depreciation is 5% of initial value. Write short notes on the following: a) Pumped storage hydro-power plants b) Two part tariff c) Ring main
(I Semester) Examination, Nov. 2002. POWER SYSTEMS
b) Calculate the available continuous power of a hydro-electric station from the ... b) With a neat diagram, explain the working of a nuclear power plant. 5 a) What ...
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