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, 2015 | |
| City, State | new delhi, |
Question Paper
State and explain about Laplace equation and Poisson's equation (No derivation).
Explain about "Heat Transfer" at the interface of two solids.
Explain about the analogy between heat flow and electricity with a suitable example.
Briefly write about Critical Radius of insulation· and Economic Thickness of insulation.
A rotor of a gas turbine is 14 cm thick at the centre and 4 cm at the top. The radius of the rotor is 50 cm. The temperatures measured at 10 cm and 50 cm are 320°C and 6OO°C respectively. The thermal conductivity of the rotor material is 0·37 Determine the radial heat flow through the rotor.
Brief about overall heat transfer coefficient, concept of thermal resistance and conductance.
A stainless steel wire, 3 mm in diameter and one meter long, carrying 200 amp current is submerged in a liquid at BO°C. [Assume K 25 resistivity 70 uohm h (heat transfer coefficient on wire surface) =4000 Determine the centre temperature of the wire.
Briefly write about the physical significance of different Non-dimensional numbers. (at least four numbers)
What do you understand by thermal radiation Also briefly write about Black Body radiation.
A steam pipe of 10 cm diameter maintained at 170°C is exposed to air at 30°C. The length of the pipe is 2 m and is kept horizontal. Taking the following properties of air at mean temperature of (170 30) find the heat lost by the pipe per hour.
[Take k 0.0322 v=23.3 x Pr 0.69 and
Water is passed through the annulus formed by the two tubes of 5 cm and 3 cm diameter at a velocity of 0·5 m/sec. If the inlet temperature of the water is 20°C and 3 cm diameter tube temperature is maintained at 80°C, find the heat transfer coefficient between the water and small tube surface.
[Take p =988
Cp =0·997 kcal/kg-°C
k =0·557
v =0·55 x
Write about Gas Radiation, Solar Radiation and Radiosity.
Write about Absorption, Reflection and Transmission with suitable examples.
State and explain about Planck's distribution law.
Explain about "Heat Transfer" at the interface of two solids.
Explain about the analogy between heat flow and electricity with a suitable example.
Briefly write about Critical Radius of insulation· and Economic Thickness of insulation.
A rotor of a gas turbine is 14 cm thick at the centre and 4 cm at the top. The radius of the rotor is 50 cm. The temperatures measured at 10 cm and 50 cm are 320°C and 6OO°C respectively. The thermal conductivity of the rotor material is 0·37 Determine the radial heat flow through the rotor.
Brief about overall heat transfer coefficient, concept of thermal resistance and conductance.
A stainless steel wire, 3 mm in diameter and one meter long, carrying 200 amp current is submerged in a liquid at BO°C. [Assume K 25 resistivity 70 uohm h (heat transfer coefficient on wire surface) =4000 Determine the centre temperature of the wire.
Briefly write about the physical significance of different Non-dimensional numbers. (at least four numbers)
What do you understand by thermal radiation Also briefly write about Black Body radiation.
A steam pipe of 10 cm diameter maintained at 170°C is exposed to air at 30°C. The length of the pipe is 2 m and is kept horizontal. Taking the following properties of air at mean temperature of (170 30) find the heat lost by the pipe per hour.
[Take k 0.0322 v=23.3 x Pr 0.69 and
Water is passed through the annulus formed by the two tubes of 5 cm and 3 cm diameter at a velocity of 0·5 m/sec. If the inlet temperature of the water is 20°C and 3 cm diameter tube temperature is maintained at 80°C, find the heat transfer coefficient between the water and small tube surface.
[Take p =988
Cp =0·997 kcal/kg-°C
k =0·557
v =0·55 x
Write about Gas Radiation, Solar Radiation and Radiosity.
Write about Absorption, Reflection and Transmission with suitable examples.
State and explain about Planck's distribution law.
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.