Exam Details
| Subject | Engineering Thermodynamics | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering (DMEVI)& B.Tech. MECHANICAL ENGINEERING 1-4 (BTMEVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2015 | |
| City, State | new delhi, |
Question Paper
What are the differences between a closed system and an open system?
In a cyclic process the work transfers are 20 10 -10 J and 30 J. What is the net heat transfer for this cyclic process?
Define entropy.
Differentiate between isothermal process and adiabatic process.
An indicator diagram for a four-stroke diesel engine cylinder gives the following results
Area of diagram =150 mm^2 Length of diagram 53 mm
Engine speed 300 rpm
Indicator spring constant =1·6 x 10^8
Cylinder bore 250 mm
Stroke 450 mm.
Calculate the following:
Mean effective pressure
Work done per machine cycle
Indicated power, in kW
What are the different kinds of fuels Describe the important properties of fuels. Define the calorific value of a fuel.
A 30 m high vertical column of a fluid of density 1878 kglm3 exists in a place where g 9·65 m/s^2. What is the pressure at the base of the column?
A reversible heat engine operating between two reservoirs at t1 and t2 has an efficiency of 70%. A manufacturer of heat engines claims that he has designed an engine which when operating between the above two temperatures develops 80 kJ of work when supplied with 100 kJ ofheat from the reservoir at tr Evaluate the validity of his claim.
State and explain the first law of thermodynamics for a closed system undergoing a change of state.
What is a PMM1 Why is it impossible?
A mass of 1·5 kg of air is compressed in a quasi-static process frOIn 0·1 MPa to 0.7 MPa for which pv constant. The initial density of the air is 1·16 kglm3. Find the work done by the piston to compress the air.
A domestic refrigerator is loaded with food and the door is dosed. 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.
State and explain the Clausius' statement of the second law of thermodynamics.
A cyclic heat engine operates between a source temperature of 800°C and a sink temperature of 30°C. What is the least rate of heat rejection per kW net output of the engine?
Draw and explain the p-V or T-s diagram of an ideal working fluid in a vapour power cycle.
A domestic food freezer maintains a temperature of 15°C. The ambient air temperature is 30°C. If heat leaks into the freezer at a continuous rate of 1·75 kJ/sec, what is the least power necessary to pump this heat out continuously?
What is universal gas constant?
What is the characteristic gas constant?
Show that for an ideal gas
Cp -Cv =R.
Show that the efficiency of the Otto cycle depends only on the compression ratio.
In a cyclic process the work transfers are 20 10 -10 J and 30 J. What is the net heat transfer for this cyclic process?
Define entropy.
Differentiate between isothermal process and adiabatic process.
An indicator diagram for a four-stroke diesel engine cylinder gives the following results
Area of diagram =150 mm^2 Length of diagram 53 mm
Engine speed 300 rpm
Indicator spring constant =1·6 x 10^8
Cylinder bore 250 mm
Stroke 450 mm.
Calculate the following:
Mean effective pressure
Work done per machine cycle
Indicated power, in kW
What are the different kinds of fuels Describe the important properties of fuels. Define the calorific value of a fuel.
A 30 m high vertical column of a fluid of density 1878 kglm3 exists in a place where g 9·65 m/s^2. What is the pressure at the base of the column?
A reversible heat engine operating between two reservoirs at t1 and t2 has an efficiency of 70%. A manufacturer of heat engines claims that he has designed an engine which when operating between the above two temperatures develops 80 kJ of work when supplied with 100 kJ ofheat from the reservoir at tr Evaluate the validity of his claim.
State and explain the first law of thermodynamics for a closed system undergoing a change of state.
What is a PMM1 Why is it impossible?
A mass of 1·5 kg of air is compressed in a quasi-static process frOIn 0·1 MPa to 0.7 MPa for which pv constant. The initial density of the air is 1·16 kglm3. Find the work done by the piston to compress the air.
A domestic refrigerator is loaded with food and the door is dosed. 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.
State and explain the Clausius' statement of the second law of thermodynamics.
A cyclic heat engine operates between a source temperature of 800°C and a sink temperature of 30°C. What is the least rate of heat rejection per kW net output of the engine?
Draw and explain the p-V or T-s diagram of an ideal working fluid in a vapour power cycle.
A domestic food freezer maintains a temperature of 15°C. The ambient air temperature is 30°C. If heat leaks into the freezer at a continuous rate of 1·75 kJ/sec, what is the least power necessary to pump this heat out continuously?
What is universal gas constant?
What is the characteristic gas constant?
Show that for an ideal gas
Cp -Cv =R.
Show that the efficiency of the Otto cycle depends only on the compression ratio.
Other Question Papers
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Subjects
- Advanced Dynamics Of Machine
- Automobile Engineering
- Combustion Engineering
- Computer Aided Manufacturing
- Computing Aided Design
- Design of Machine Elements
- Engineering Metallurgy
- Engineering Thermodynamics
- Experimental Stress Analysis
- Finite Element Analysis
- Fluid Mechanics
- Heat And Mass Transfer
- Heat Transfer
- I.C. Engines
- Industrial Engineering
- Industrial Ergonomics
- Industrial Measurement And Quality Control
- Industrial Organization And Management
- Kinematics and Dynamics of Machines
- Machine Design - I
- Machine Design-Ii
- Machine Drawing
- Machines Tools
- Maintenance Engineering
- Material Science
- Materials Handling
- Mechanical System Design
- Mechanical Vibration
- Mechanics Of Materials
- Mechatronics
- Metrology
- Metrology And Quality Control
- Non-Conventional Energy Resources
- Non-Destructive Testing
- Nuclear Power Engineering
- Optimisation Techniques In Engineering
- Optimization For Engineering Design
- Power Plant Engineering
- Power Transmitting Elements
- Product Development And Design
- Production And Operations Management
- Production Technology - Ii
- Production Technology-I
- Refrigeration And Air Conditioning
- Refrigeration System
- Robotics
- Safety Engineering
- Technical Entrepreneurship
- Thermal Engineering
- Thermal Engineering - I
- Thermofluid Engineering
- Total Quality Management (Tqm)
- Tribology
- Turbo Machines
- Unconventional Manufacturing Processes
- Welding Engg.