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 | June, 2015 | |
| City, State | new delhi, |
Question Paper
Explain about the mechanism of thermal conduction in solids.
What do you understand by heat transfer coefficient Explain its utilities.
Briefly describe Fourier's conduction equation (no derivation) with a flow diagram.
Determine the loss of heat through the wall of a rotating sphere shaped boiling pan with an inner diameter d1 1·5 m and total boiler wall thickness 20 cm. Inner surface temperature is 200°C and that of outer surface T2 50°C. The equivalent thermal conductivity is 0·12 kcal/m-hr-°C. Also find the heat flux.
A current of 300 amps is passed through a stainless steel wire 2·5 mm in diameter. The resistivity of the wire may be taken as 70 M ohm-cm and the length of the wire is 1·5 metre. If the outer surface temperature of the WIre is maintained at 180°C, calculate the centre temperature of the wire. (For stainless steel, take K =25
Is there any difference between a fin and an extended surface With neat diagrams describe few extended surfaces.
Find the heat loss from a rod 4 cm in diameter and infinitely long when its base is maintained at 100°C. The conductivity of the material is 50 kcal/m-hr-°C and the heat transfer coefficient on the surface of the rod is kcal/m^2-hr-°C. The temperature of the air surrounding the rod is 20°C.
Briefly discuss about Biot and Fourier Numbers. Also explain the criteria for neglecting internal temperature gradient.
Briefly discuss about Newton's law of cooling and Boundary layer theory.
What are the advantages and limitations of Dimensional Analysis
Calculate the heat transfer coefficient for water flowing through a 2 em diameter tube with a velocity of 2·5 m/s. The average temperature of water is 50°C and the surface temperature of the tube is slightly below this temperature. 7 [Assume that the flow is turbulent, and the properties at 50°C are
Cp= 4182 J/kg
0·643 W/mK
p 988
M 544 x kg/ms]
Briefly discuss about Forced convection and Natural convection with suitable examples.
The Sun emits maximum radiation at
A. =0·52 M. Assuming the Sun as a black body, find the surface temperature of the Sun and emissive power at that temperature.
What is condensation? Write down the assumptions in deriving the mathematical solution given by Nusselt for laminar film condensation.
What do you understand by heat transfer coefficient Explain its utilities.
Briefly describe Fourier's conduction equation (no derivation) with a flow diagram.
Determine the loss of heat through the wall of a rotating sphere shaped boiling pan with an inner diameter d1 1·5 m and total boiler wall thickness 20 cm. Inner surface temperature is 200°C and that of outer surface T2 50°C. The equivalent thermal conductivity is 0·12 kcal/m-hr-°C. Also find the heat flux.
A current of 300 amps is passed through a stainless steel wire 2·5 mm in diameter. The resistivity of the wire may be taken as 70 M ohm-cm and the length of the wire is 1·5 metre. If the outer surface temperature of the WIre is maintained at 180°C, calculate the centre temperature of the wire. (For stainless steel, take K =25
Is there any difference between a fin and an extended surface With neat diagrams describe few extended surfaces.
Find the heat loss from a rod 4 cm in diameter and infinitely long when its base is maintained at 100°C. The conductivity of the material is 50 kcal/m-hr-°C and the heat transfer coefficient on the surface of the rod is kcal/m^2-hr-°C. The temperature of the air surrounding the rod is 20°C.
Briefly discuss about Biot and Fourier Numbers. Also explain the criteria for neglecting internal temperature gradient.
Briefly discuss about Newton's law of cooling and Boundary layer theory.
What are the advantages and limitations of Dimensional Analysis
Calculate the heat transfer coefficient for water flowing through a 2 em diameter tube with a velocity of 2·5 m/s. The average temperature of water is 50°C and the surface temperature of the tube is slightly below this temperature. 7 [Assume that the flow is turbulent, and the properties at 50°C are
Cp= 4182 J/kg
0·643 W/mK
p 988
M 544 x kg/ms]
Briefly discuss about Forced convection and Natural convection with suitable examples.
The Sun emits maximum radiation at
A. =0·52 M. Assuming the Sun as a black body, find the surface temperature of the Sun and emissive power at that temperature.
What is condensation? Write down the assumptions in deriving the mathematical solution given by Nusselt for laminar film condensation.
Other Question Papers
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