Exam Details
| Subject | Heat Transfer | |
| 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, 2016 | |
| City, State | new delhi, |
Question Paper
What are the different modes of heat transfer How do these modes of heat transfer differ?
Differentiate between dropwise and filmwise condensation.
2.(a) Find the expression for heat conducted through a slab of thickness (L),cross-sectional area having
temperatures T1 and T2 at both ends for steady state.
How do thermal conductivities of gases and liquids vary with temperature?
3.(a) Describe Stefan-Bultzmann's law. A black body of surface area 2 x m^2 is heated to 127°C and is suspended in a room having temperature 27°C. Find the initial rate of loss of heat from the black body.
4.(a) Explain electrical analogy for heat transfer. Find the thermal resistance for conduction and convection heat transfer. An electric heater emits 1000 watts of thermal radiation. The filament has surface area 0·06 m^2 and may be presumed as a black body. Find its temperature, if cr x K^4.
5.(a) Describe briefly the thermal boundary layer over a flat plate with flow of fluid. A hollow cylinder has inside radius 2·5 cm and outside radius 5 cm. Inside temperature IS 300°C and outside temperature is 110°C. Find the temperature at 3·75 cm from the centre, if K =70 W/m-K. Also find the heat flow through the cylinder, per unit length.
6.(a) What do you understand by 'black Is ice a black body Justify your answer.
(b)Explain the various regimes of the saturated pool boiling.
7.(a) What is Kirchhoffs law of radiation Explain.
Prove that the shape factor of the cylindrical cavity as shown in Figure 1 is 4h/4h d. <img src='./qimages/9005-7b.jpg'>
Differentiate between dropwise and filmwise condensation.
2.(a) Find the expression for heat conducted through a slab of thickness (L),cross-sectional area having
temperatures T1 and T2 at both ends for steady state.
How do thermal conductivities of gases and liquids vary with temperature?
3.(a) Describe Stefan-Bultzmann's law. A black body of surface area 2 x m^2 is heated to 127°C and is suspended in a room having temperature 27°C. Find the initial rate of loss of heat from the black body.
4.(a) Explain electrical analogy for heat transfer. Find the thermal resistance for conduction and convection heat transfer. An electric heater emits 1000 watts of thermal radiation. The filament has surface area 0·06 m^2 and may be presumed as a black body. Find its temperature, if cr x K^4.
5.(a) Describe briefly the thermal boundary layer over a flat plate with flow of fluid. A hollow cylinder has inside radius 2·5 cm and outside radius 5 cm. Inside temperature IS 300°C and outside temperature is 110°C. Find the temperature at 3·75 cm from the centre, if K =70 W/m-K. Also find the heat flow through the cylinder, per unit length.
6.(a) What do you understand by 'black Is ice a black body Justify your answer.
(b)Explain the various regimes of the saturated pool boiling.
7.(a) What is Kirchhoffs law of radiation Explain.
Prove that the shape factor of the cylindrical cavity as shown in Figure 1 is 4h/4h d. <img src='./qimages/9005-7b.jpg'>
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
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- Non-Conventional Energy Resources
- Non-Destructive Testing
- Nuclear Power Engineering
- Optimisation Techniques In Engineering
- Optimization For Engineering Design
- Power Plant Engineering
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- 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.