Exam Details
| Subject | Engineering Thermodynamics | |
| Paper | ||
| Exam / Course | Bachelor of Technology in Mechanical Engineering (Computer Integrated Manufacturing) BTME | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 4
IBMEoOI91
B.Tech. MECHANICAL ENGINEERING (COMPUTER INTEGRATED
MANUFACTURING) I BTMEVI
Term-End Examination 00443 December, 2016 BME-019 ENGINEERING THERMODYNAMICS
Time hours Maximum Marks: 70
Note: Attempt any seven questions, All questions carry equal marks. Use of scientific calculator is permitted. Use of steam table is also allowed, Assume missing data, if any.
1. State the thermodynamic definition of work. Also differentiate between heat and work.
A platinum resistance thermometer has a resistance of 2.8 ohm at O°C and 3.8 ohm at 100°C, Calculate the temperature when the resistance indicated is 5.8 ohm, 5 5
2. Define an isolated system. What is thermodynamic cycle?
An engine cylinder has a piston of area 0.12 m^2 and contains gas at a pressure of 1.5 MPa. The gas expands according to a process which is represented by a straight line on a pressure-volume diagram. The final pressure is 0.15 MPa. Calculate the work done by the gas on the piston, if the stroke is 0.30 m. 5 5
3. Explain vapour compression refrigeration cycle With the help of a block diagram.
A single-cylinder, single-acting, 4-stroke engine of 0.15 m bore develops an indicated power of 4 kW when running at 216 rpm. Calculate the area of the indicator diagram that would be obtained With an indicator having a spring constant of 25 x 106 N/m3. The length of the indicator diagram is 0.1 times the length of the stroke of the engine. 5 5
4. Determine the total work done by a gas system following an expansion process as shown in Figure . 10 <img src='./qimages/8853-4.jpg'>
5. Briefly explain the equivalence of Kelvin-Planck and Clausius statements of the second law of thermodynamics.
In a cyclic process, heat transfers are 19.3 kJ, -29.5 kJ, -2.95 kJ, 15.5 kJ and 30.5 kJ. What is the net work for this cyclic process? 5 5
6. What is an ideal gas What is the difference between universal gas constant and characteristic gas constant?
A domestic refrigerator is loaded with food and the door is closed. During a certain period the machine consumes 1 kWh of energy and the internal energy of the system drops by 5000 kJ. Find the net heat transfer for the system. 5 5
7. Show the work in non-flow process for polytropic process pV^n =Constant is given by
W p1V1
where symbols carry usual meanings.
A cyclic heat engine operates between a source temperature of 100°C and a sink temperature of 30°C. What is the least rate of heat rejection per kW net output of the engine? 5 5
8. Define 'change of state', and 'process'. What are 'intensive' and 'extensive' properties
A heat engine receives half of its heat supply at 1000 K and half at 500 K while rejecting heat to a sink at 300 K What is the maximum thermal efficiency of the heat engine? 5 5
9. Define entropy. Show that entropy is a property of a system.
Find the enthalpy, entropy and volume of steam at 1.4 MFa, 380°C. 5 5
10. What is a heat pump How does it differ from a refrigerator?
Determine the ideal COP of an absorption refrigerating system in which the heating, cooling and refrigeration take place at 197°C, 17°C and respectively. 5 5
IBMEoOI91
B.Tech. MECHANICAL ENGINEERING (COMPUTER INTEGRATED
MANUFACTURING) I BTMEVI
Term-End Examination 00443 December, 2016 BME-019 ENGINEERING THERMODYNAMICS
Time hours Maximum Marks: 70
Note: Attempt any seven questions, All questions carry equal marks. Use of scientific calculator is permitted. Use of steam table is also allowed, Assume missing data, if any.
1. State the thermodynamic definition of work. Also differentiate between heat and work.
A platinum resistance thermometer has a resistance of 2.8 ohm at O°C and 3.8 ohm at 100°C, Calculate the temperature when the resistance indicated is 5.8 ohm, 5 5
2. Define an isolated system. What is thermodynamic cycle?
An engine cylinder has a piston of area 0.12 m^2 and contains gas at a pressure of 1.5 MPa. The gas expands according to a process which is represented by a straight line on a pressure-volume diagram. The final pressure is 0.15 MPa. Calculate the work done by the gas on the piston, if the stroke is 0.30 m. 5 5
3. Explain vapour compression refrigeration cycle With the help of a block diagram.
A single-cylinder, single-acting, 4-stroke engine of 0.15 m bore develops an indicated power of 4 kW when running at 216 rpm. Calculate the area of the indicator diagram that would be obtained With an indicator having a spring constant of 25 x 106 N/m3. The length of the indicator diagram is 0.1 times the length of the stroke of the engine. 5 5
4. Determine the total work done by a gas system following an expansion process as shown in Figure . 10 <img src='./qimages/8853-4.jpg'>
5. Briefly explain the equivalence of Kelvin-Planck and Clausius statements of the second law of thermodynamics.
In a cyclic process, heat transfers are 19.3 kJ, -29.5 kJ, -2.95 kJ, 15.5 kJ and 30.5 kJ. What is the net work for this cyclic process? 5 5
6. What is an ideal gas What is the difference between universal gas constant and characteristic gas constant?
A domestic refrigerator is loaded with food and the door is closed. During a certain period the machine consumes 1 kWh of energy and the internal energy of the system drops by 5000 kJ. Find the net heat transfer for the system. 5 5
7. Show the work in non-flow process for polytropic process pV^n =Constant is given by
W p1V1
where symbols carry usual meanings.
A cyclic heat engine operates between a source temperature of 100°C and a sink temperature of 30°C. What is the least rate of heat rejection per kW net output of the engine? 5 5
8. Define 'change of state', and 'process'. What are 'intensive' and 'extensive' properties
A heat engine receives half of its heat supply at 1000 K and half at 500 K while rejecting heat to a sink at 300 K What is the maximum thermal efficiency of the heat engine? 5 5
9. Define entropy. Show that entropy is a property of a system.
Find the enthalpy, entropy and volume of steam at 1.4 MFa, 380°C. 5 5
10. What is a heat pump How does it differ from a refrigerator?
Determine the ideal COP of an absorption refrigerating system in which the heating, cooling and refrigeration take place at 197°C, 17°C and respectively. 5 5
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