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Code: 15A03804
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B.Tech IV Year II Semester (R15) Advanced Supplementary Examinations July 2019
POWER PLANT ENGINEERING
(Mechanical Engineering)
Time: 3 hours
Max. Marks: 70
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PART - A
(Compulsory Question)
Answer the following: (10 X 02 = 20 Marks)
(a) Explain the principle of harnessing nuclear energy.
(b) How important is cost analysis of a power plant? Explain.
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(c) Explain the necessity of a proper draught system.
(d) What is enthalpy of steam? Write an expression for enthalpy of a superheated steam.
(e) Draw neat sketch of an IC engine and label its parts.
(f) List the different methods to improve efficiency of a gas turbine plant.
(g) List the different types of gates used in dams.
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(h) Explain the function of surge tank.
(i) List the advantages of non-conventional sources over conventional sources.
(j) Give a note of usage of graphite in nuclear reactors.
PART - B
(Answer all five units, 5 X 10 = 50 Marks)
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UNIT - I
2 Give a note on the scenario of power generation from renewable sources in India.
OR
3 Define load factor. A power station supplies the following loads to the consumers.
Time in hrs 0-6 6-10 10-12 12-16 16-20 20-22 22-24
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Load in MW 30 70 90 60 100 80 60
(i) Draw the load curve and estimate the load factor of the plant.
(ii) What is the load factor of a standby equipment of 30 MW capacity if it takes up all the loads above 70 MW. What is the use factor?
UNIT - II
4 (a) Explain with neat sketch the working principle of out plant handing of coal.
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(b) Explain how waste heat recovery is achieved in modern boilers.
OR
5 (a) Explain with neat sketch the working principle of overfeed stoker.
(b) Explain the neat diagram the working principle of cyclone furnace.
UNIT - III
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6 Explain with suitable diagram the working of diesel power plant.
OR
7 An open cycle constant pressure gas turbine plant consists of two turbines with perfect intercooling and a two stage turbine with a reheater. Air enters at 1 bar, 15°C. The maximum pressure ratio and the maximum temperature of the cycle are limited to 5 and 800°C respectively. The reheating takes place at 2.3 bar to 800°C. The isentropic efficiencies of each compressor and each turbine are 0.8 and 0.9 respectively. The calorific value of fuel is 42 MJ/kg. Taking Cp = 1.005 kJ/kgK and y = 1.33 for gases and neglecting pressure and heat losses and if the flow rate of air is 25 kg/s, estimate: (i) The overall thermal efficiency of the plant. (ii) The air fuel ratio. (iii) The specific fuel consumption. (iv) Power output of the plant.
Contd. in page 2
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Firstranker's choice
Code: 15A03804
UNIT - IV
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8 Give a note on hydroelectric power plant generation in India and its future with neat diagram.
OR
9 (a) A Pelton wheel driven by two similar jets transmits 4000 kW to the shaft while running at 400 rpm. The head from the reservoir level to the nozzle is 200 m and the efficiency of power transmission through the pipelines and nozzles is 90%. The jets are tangential to a 1.50 m diameter circle. The relative velocity decreases by 10% as the water traverses the buckets, which are so shaped that they would, if stationary, deflect the jet by 165°C. Neglecting the windage losses, estimate: (i) The efficiency of the runner. (ii) The diameter of each jet.
(b) Explain classification of dams and spillways.
UNIT - V
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10 Differentiate between solar thermal and solar photovoltaic. List the different types of solar collectors and explain any one of them with a neat sketch.
OR
11 (a) Differentiate between heavy water reactors and gas cooled reactors.
(b) With a neat sketch, explain the working of a pressurized water reactor.
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