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1997 Course Applied Thermodynamics - III

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Total No. of Questions : 10] P1135 [Total No. of Pages :3 [3864] - 12 B.E. (Mech. S/W) APPLIED THERMODYNAMICS - III (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Answer any three questions from section I and any three questions from section II 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of electronic pocket calculator is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) What are static and stagnation properties? Explain. [4] Explain with sketches the following i) Mach line, ii) Mach angle, iii) Mach cone, iv) Mach wave, [4] With usual notation derive the following relation for adiabatic flow [8] Po = P+ Q2) a) b) 2 9 2 2 + M + 2 K . M 4 + ........ 2 4 12 2 KM Explain function and applications of Nozzles. [5] Steam enters a convergent - divergent nozzle at pressure of 22 bar and temperature of 3000c the exit pressure is 4 bar steam flow rate is 11 kg/ sec find [12] i) Velocity of steam at throat and exit. ii) Area of nozzle at throat and exit in mm2. Q3) Write short notes on (any four) : a) Compounding of turbines. b) Comparison of steam turbine and steam engine. c) Zone of silence and zone of action. d) Surface condensers. e) Air pumps. [16] P.T.O. Q4) A steam turbine has a steam flow rate of 10,000 kg/hr. Steam enters the surface condenser at 40 C and 0.85 dry. Air leakage is 30 kg/ hr.condensate is at 300 C find [16] a) Capacity of the wet air pump in m3/min. b) Quantity of coolingwater circulated, if the rise in temperature is 10 C in kg/min. Q5) a) b) Write - Governing of steam turbine. [5] Steam is supplied to a three stage turbine at 35 bar and 400 C and exhaust at 0.05 bar and o. dry. if the work developed per stage is equal, find.[12] i) Condition at entry to each stage. ii) Stage efficiencies. iii) Reheat factor. iv) Overall efficiency. SECTION - II Q6) a) b) c) Q7) a) b) Discuss the working of BENSON Boiler with a neat sketch and list the advantages of this boiler. [8] Explain the important features of high pressure boilers. [6] Write a note on pulverised fuel firing. [4] Explain the working of a closed cycle gas turbine with a neat layout and [8] list advantages and disadvantages of closed cycle plant. The following data referes to a gas turbine plant. i) Air at 1 bar and 300 k is compressed adiabatically to 6.2 bar. ii) Cp for air = 1.005 kJ/kg - k and r = 1.4. iii) The compressor efficiency is 88%. iv) The fuel heating value 44186 KJ/kg and fuel air ratio is 0.017. v) The turbine internal efficiency is 90% calculate the work out put of turbine and work input to compressor per kg of air compressed and thermal efficiency of plant. Assume Cp = 1.147 kJ/kg - K and r =1.333 for products of combustion. [8] Q8) Write notes on (any four) : a) Co-generation. b) PWR. c) Nuclear Fuels. d) Feed water treatment. e) Nuclear waste disposal. [3864]-12 [16] -2- Q9) a) b) Q10)a) b) Explain the load curves for four different consumers. How load duration curve is constructed and what is its use? [8] Define and explain the following:Diversity factor, Load factor, Demand factor and capacity factor. [8] Explain the working of RAM jet with a neat layout. Discuss its thermodynamic cycle. List its advantages, disadvantages and applications. [10] Explain with a neat sketch the working of liquid propellant rocket. [6] kbkb [3864]-12 -3-

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