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Karpagam Institute of Technology COIMBATORE - 641 105: Continuous Internal Assessment Retest - I

This document appears to be an exam for an aeronautical engineering course covering topics in thermodynamics. It contains two sections - a multiple choice section with 10 questions worth 2 marks each, and an long answer section containing 5 questions worth 16 marks each. The long answer questions cover topics such as steady flow energy equations, gas expansion processes in turbines and nozzles, heat engines and refrigeration cycles operating between multiple temperature reservoirs, entropy changes in heat engines, analyzing thermodynamic cycles like diesel and Otto cycles using P-V and T-S diagrams, and calculating efficiency and mean effective pressure in internal combustion engines.

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136 views3 pages

Karpagam Institute of Technology COIMBATORE - 641 105: Continuous Internal Assessment Retest - I

This document appears to be an exam for an aeronautical engineering course covering topics in thermodynamics. It contains two sections - a multiple choice section with 10 questions worth 2 marks each, and an long answer section containing 5 questions worth 16 marks each. The long answer questions cover topics such as steady flow energy equations, gas expansion processes in turbines and nozzles, heat engines and refrigeration cycles operating between multiple temperature reservoirs, entropy changes in heat engines, analyzing thermodynamic cycles like diesel and Otto cycles using P-V and T-S diagrams, and calculating efficiency and mean effective pressure in internal combustion engines.

Uploaded by

qbit_madhan1058
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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KARPAGAM INSTITUTE OF TECHNOLOGY COIMBATORE 641 105

DEPARTMENT OF AERONAUTICAL ENGINEERING CONTINUOUS INTERNAL ASSESSMENT RETEST - I Code/Subject Date/Session Marks : AE2202/Aero Engineering Thermodynamics : 20.08.2013/AN : 100 PART A Answer all Questions (10 X 2 = 10) 1. What is quasi-Static process? 2. What is the significance of mean effective pressure? 3. Differentiate between point and path function. 4. Define closed cycle with example. 5. Sketch the T-s and P-v diagram for Otto cycle. 6. Define zeroth law. 7. State an entropy. 8. Define the term of reversibility. 9. Define the term of COP. 10. State Carnot theorem. PART B Answer all Questions (5 X 16 = 80) 1. a) What do you understand by displacement of work? (OR) b) What do you understand by point function and path function? 2. a) Describe steady flow energy equation and deduce suitable expression for the expansion of gas in a gas turbine with suitable assumptions. (OR) b) Describe steady flow energy equation and deduce suitable expression for the expansion of gas in a Nozzle with suitable assumptions. 3. a)In Air compressor air flows steadily at the rate of 0.5 Kg/Sec through an air compressor in entered at 6 m/s with a pressure 1 bar and specific volume 0.8 m3/Kg and leaves 5 m/s with pressure 7 bar and specific volume 0.16 m3/Kg. The energy of air leaving 90 KJ/Kg greater than the air entering energy. The cooling water in a jacket surrounding in a cylinder absorb the heat from air at 60 Kg/s. i) calculate power required to drive the compressor ii) Inlet and outlet pipe cross section area. (OR) Year/Sem : II/III Time : 3 Hrs

b) A nozzle is a device for increasing the velocity of a steadily flowing team, at the inlet to a certain nozzle, the enthalpy of the fluid passing is 3000 KJ/Kg and the velocity is 60 m/s. At the discharge end the enthalpy 2762 KJ/Kg. the nozzle is horizontal and there is negligible heat loss from it. (i) Find the velocity at exit from the nozzle. (ii) if the inlet area is 0.1 m2 and the specific volume at inlet is 0.187 m3/Kg. find the mass flow rate. (iii) if the specific volume at the nozzle exit is 0.498 m3/Kg. find the exit area of the nozzle. 4. a)A reversible heat engine operates between two reservoirs at temperature of 600o C and 400C. the engine drives a reversible refrigerator which operates between reservoirs at temperature of 400C and -200C. the heat transfer to the engine is 2000 kJ and network output of the combined engine refrigerator plant is 360 KJ. Evaluate the heat transfer to the refrigerant and the net heat transfer to the reservoir at 400C. (OR) b)A cyclic heat engine operates between a source temperature 8000C and a sink temperature of 30oC . what is the least rate of heat rejection per KW net output of the engine? 5. a)A Carnot engine operated between 8oC and 560oC. If the engine produces 600 KJ of work, determine the entropy change during heat addition and heat rejection. (OR) 6. a)Explain briefly Diesel cycle with the help of P-V and T-S diagrams and drive the expressions for the ideal efficiency of diesel cycle. (OR) b)Explain briefly Otto cycle with the help of P-V and T-S diagrams and drive an expressions for the ideal efficiency of otto cycle. 7. a)The stroke and cylinder diameter of a compression ignition engine are 250 mm and 150mm respectively. If the clearance volume id 0.0004 m3 and fuel injection takes place at constant pressure for 5 per cent of the stroke determine the efficiency of the determine the efficiency of the engine assume the engine working on the diesel cycle. (OR) b)In an ideal diesel cycle , the temperature at the beginning and end of compression are 570C and 6030C respectively. The temperature at the beginning and end of expansion are 1950oC and 870oC respectively . Determine the ideal efficiency of the cycle =1.4. 8. An engine of 250 mm bore and 375 mm stroke works on Otto cycle. The clearance volume is 0.00263 m3. The initial pressure and temperature are 1 bar and 500C. if the maximum pressure is limited to 25 bar, find the following : (i) The air standard efficiency of the cycle (ii) The mean effective pressure for the cycle.

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