Power Plant Engineering - Dec 2016
Mechanical Engg (Semester 8)
TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
Solve any one question from Q.1(a,b) & Q.2(a,b)
1(a) Discuss the present scenario of power generation in India.(4 marks)
1(b) During trial on steam condenser following oberseravtions were redcorded.
Condenser vacuum = 680 mm of Hg
Barometer reading = 764 mm of Hg
Mean condenser temp. = 36.2°C
Hot well temp.= 30°C
Condensate formed per hour = 1780 Kg
Circulating cooling water inlet temp. = 20°C
Circulating cooling water outlet temp. =32°C
Quantity of cooling water = 1250 Kg/min.
Determine i) condenser vaccum corrected to standard barometer ii) vacuum efficiency iii) under cooling of condensate iv) condenser efficiency.(6 marks) 10(a) Draw the typical layout of electrical equipment & discuss the role of control room.(8 marks) 10(b) What are different methods used to control SO2 in the flue gases? Explain any two.(8 marks) 2(a) From following data calculate cost of generation per unit delivered from the power plant.
Installed capacity of power plant = 200Mw
Annual load factor = 0.4
Capital cost of powerplant = Rs. 280 Lacks
Annual cost of fuel, Oil, Salaries & taxation = Rs. 60 Lacks Interest & depreciation = 13%(6 marks) 2(b) With neat sketch explain ash handling system.(4 marks)
Solve any one question fromQ.3(a,b) & Q.4(a,b)
3(a) Write a note on Hydrograph and Flow duration curve.(4 marks) 3(b) Explain with neat sketch CANDU reactor. Also state the merits and demerits.(6 marks) 4(a) Discuss the site selection, advantages & disadvantages for Hydroelectric Power Plant.(6 marks) 4(b) Write a note on Nuclear waster disposal.(4 marks)
Solve any one question fromQ.5(a,b)& Q.6(a,b)
5(a) Draw a typical layout of Diesel Power Station and Explain it.(6 marks) 5(b) A Gas turbine unit has pressure ratio 6:1 & maximum cycle temperature of 610°C. The compressor and turbine are 0.80 and 0.82 respectively. Calculate power output in kilowatts of an electrical generator geared to the turbine when the air enters the compressor at 15°C at the rate of 16 Kg/Sec. Also calculate thermal efficiency an work ration of the plant. Assume i) Cp=1.005 Kj/Kg & γ =1.4 for compression processes ii) Cp=1.11Kj/Kg & γ=1.333 for expansion processes iii) Cp= 1.11Kj/Kg for combustion processes.(10 marks) 6(a) Discuss the the selection of engine size, advantages & disadvantagesof Diesel engine power plant?(6 marks) 6(b) In a Gas turbine the compressor takes in air at a temp. Of 15°C and compresses it to four times the initial pressure with an isentropic efficiency of 82%. The air is then passed through heat exchanger heated by turbine exhaust before reaching combustion chamber. In the heat exchanger 78% of available heat is given to air. The maximum temp. After constant pressure combustion is 600°C and efficiency of turbine is 70%. Neglecting all losses except those mentioned and assuming working fluid throughout the cycle to have characteristics of air. Find the thermal efficiency of cycle. Assume: R=0.287Kj/Kg. K and γ=1.4 for air and constant specific heat throughout.(10 marks)
Solve any one question fromQ.7(a,b)& Q.8(a,b)
7(a)(i) Write a note on
i) Challenges in commercialization of Non-Conventional Power Plants.(5 marks) 7(a)(ii) Low & High Temperature Solar Power Plant.(5 marks) 7(b) Explain single basin and double basin tidal power plant with neat diagrams.(8 marks) 8(a) With neat sketch explain the working of a fuel cell and list out its advantages over other nonconventional systems.(10 marks) 8(b) Dicuss the parameters to be consider for site selection of wind power plant(8 marks)
Solve any one question fromQ.9(a,b,c) & Q.10(a,b)
9(a) State the various protective equipments and explain the working of switch gear in powerplant.(8 marks) 9(b) Write a note on thermal pollution of water & its control.(4 marks) 9(c) Write a note on Noise pollution by power plant.(4 marks)