THERMAL ENGINEERING-II
ASSIGNMENT-II
1(a).Define the term degree of reaction for the reaction turbine and show that its value is 0.5 for parson’s reaction turbine
(b).In a single stage reaction turbine, both the fixed and moving blades have the same tip angles of 35o and 0o for inlet and outlet respectively. Determine the power required if the isentropic heat drop in fixed and moving row is23.5kJ/kg. The man blade speed is 80 m/s and the steam consumption is 22,500 kg/h
2. A reaction turbine has drum diameter of 2.15 m at a speed of 750 rpm with 14.5 kg/s of steam consumption. The height of the blade at a certain location is 0.16 m while the discharge angle is 25o.The pressure at this place is 4 bar and dryness fraction is 0.97.Estimate the power developed in the particular ring by assuming the turbine efficiency of 75%.Also find the heat drop while the steam passing over the pair of blades.
3(a).Explain the functionality of reaction steam turbine with suitable diagram. And how it is different from the impulse turbine?
(b).What are different losses that are occurring in reaction turbine? Explain with preventive measures.
4. (a).What are the advantages and limitations of surface condenser over jet condensers.
(b).What are the sources of air leakage in steam condensers?.Explain the effect of air leakage on condenser performance.
5.(a).What are the principal requirement of steam condensing plant in power generation unit. Explain
(b).What are the advantages obtained by incorporating the condenser in a steam power plant. Explain
6. (a).A surface condenser receives 15000 kg of steam per hour after the steam does work in the turbine. The steam at 10 bar and 250oC enters the turbine and the vacuum at the condenser is maintained at 650 mm of Hg, when barometer reads 752 mm of Hg. The rise in the temperature of cooling water is limited to 15oC,the temperature of the condensate leaving the condenser is 35oC.What is the amount of cooling water required per hr.
6.(b).Ina surface condenser the pressure of steam is 12 kPa and the cooling water flow rate is 40 kg/kg of steam condensed. The condensate leaves at 44oC and the rise in temperature of circulating water is 14oC.Determine the dryness fraction of steam entering into the condenser.
7. A Brayton cycle works between 1 bar,300 K and 5 bar,1250 K. There are two stages of compression with perfect intercooling and two stages of expansion with reheating. The work out put if first expansion stage being used to drive the two compressors. where the inter stage pressure is optimized for the compressor. The air from the first stage turbine is again heated to 1250K and expanded. Calculate the power output of free power turbine and cycle efficiency without and with perfect heat exchanger and compare them .also calculate the percentage improvement in the efficiency because of addition of heat exchangers.
8. Compare the maximum work delivered by an air gas turbine which works with two stage compression with inter cooling. the compressor pressure ratio is 4 and the temperature limit is 1000 K, for the given ambient condition 1 bar and 301 K. If the temperature and pressure at 6000 m altitude is -25oC and 0.5 bar, find the percentage change in network output, efficiency and exhaust gas temperature if the volume flow rate is 2.5m3/s
9. (a).Calculate the condition of maximum efficiency of the Brayton cycle and also derive the efficiency equation
(b).Explain the working principles of gas turbine long with p-v and T=-s diagrams
10.(a)Discuss the advantage and limitations of turboprop engine over turbo jet engine
(b).Explain the operating principles of rocket engine with a neat diagram?
11.(a).What is the operating principle of rocket engine. Discuss the advantages and disadvantages of rocket engines.
11. (b).Explain the essential difference between rocket propulsion and turbojet propulsion
12(a) with the neat sketch explains the working of ramjet engine and explain its working principle
(b) What are the important parameters to evaluate the performance of a rocket engine? Explain
ASSIGNMENT-II
1(a).Define the term degree of reaction for the reaction turbine and show that its value is 0.5 for parson’s reaction turbine
(b).In a single stage reaction turbine, both the fixed and moving blades have the same tip angles of 35o and 0o for inlet and outlet respectively. Determine the power required if the isentropic heat drop in fixed and moving row is23.5kJ/kg. The man blade speed is 80 m/s and the steam consumption is 22,500 kg/h
2. A reaction turbine has drum diameter of 2.15 m at a speed of 750 rpm with 14.5 kg/s of steam consumption. The height of the blade at a certain location is 0.16 m while the discharge angle is 25o.The pressure at this place is 4 bar and dryness fraction is 0.97.Estimate the power developed in the particular ring by assuming the turbine efficiency of 75%.Also find the heat drop while the steam passing over the pair of blades.
3(a).Explain the functionality of reaction steam turbine with suitable diagram. And how it is different from the impulse turbine?
(b).What are different losses that are occurring in reaction turbine? Explain with preventive measures.
4. (a).What are the advantages and limitations of surface condenser over jet condensers.
(b).What are the sources of air leakage in steam condensers?.Explain the effect of air leakage on condenser performance.
5.(a).What are the principal requirement of steam condensing plant in power generation unit. Explain
(b).What are the advantages obtained by incorporating the condenser in a steam power plant. Explain
6. (a).A surface condenser receives 15000 kg of steam per hour after the steam does work in the turbine. The steam at 10 bar and 250oC enters the turbine and the vacuum at the condenser is maintained at 650 mm of Hg, when barometer reads 752 mm of Hg. The rise in the temperature of cooling water is limited to 15oC,the temperature of the condensate leaving the condenser is 35oC.What is the amount of cooling water required per hr.
6.(b).Ina surface condenser the pressure of steam is 12 kPa and the cooling water flow rate is 40 kg/kg of steam condensed. The condensate leaves at 44oC and the rise in temperature of circulating water is 14oC.Determine the dryness fraction of steam entering into the condenser.
7. A Brayton cycle works between 1 bar,300 K and 5 bar,1250 K. There are two stages of compression with perfect intercooling and two stages of expansion with reheating. The work out put if first expansion stage being used to drive the two compressors. where the inter stage pressure is optimized for the compressor. The air from the first stage turbine is again heated to 1250K and expanded. Calculate the power output of free power turbine and cycle efficiency without and with perfect heat exchanger and compare them .also calculate the percentage improvement in the efficiency because of addition of heat exchangers.
8. Compare the maximum work delivered by an air gas turbine which works with two stage compression with inter cooling. the compressor pressure ratio is 4 and the temperature limit is 1000 K, for the given ambient condition 1 bar and 301 K. If the temperature and pressure at 6000 m altitude is -25oC and 0.5 bar, find the percentage change in network output, efficiency and exhaust gas temperature if the volume flow rate is 2.5m3/s
9. (a).Calculate the condition of maximum efficiency of the Brayton cycle and also derive the efficiency equation
(b).Explain the working principles of gas turbine long with p-v and T=-s diagrams
10.(a)Discuss the advantage and limitations of turboprop engine over turbo jet engine
(b).Explain the operating principles of rocket engine with a neat diagram?
11.(a).What is the operating principle of rocket engine. Discuss the advantages and disadvantages of rocket engines.
11. (b).Explain the essential difference between rocket propulsion and turbojet propulsion
12(a) with the neat sketch explains the working of ramjet engine and explain its working principle
(b) What are the important parameters to evaluate the performance of a rocket engine? Explain
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