Roll No. Total No. of Pages : 02
Total No. of Questions : 09
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B.Tech.(AE) (2011 Onwards) (Sem.=5)HEAT TRANSFER
Subject Code : BTAE-503
M.Code : 70486
Time : 3 Hrs. Max. Marks : 60
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INSTRUCTION TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students has to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students has to attempt any TWO questions.
SECTION-A
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- Write briefly :
- Explain the mechanism of heat transfer in fluids:
- Write the Fourier's equation of conduction; in spherical coordinates.
- What do you mean by critical thickness of insulation?
- What do you mean by thermal stresses?
- What is NTU?
- Why counter flow heat exchanger is more effective than parallel flow?
- What do you mean Gray bodies, how they are different from black bodies?
- What is characteristic length?
- Which dimensionless number is more significant in turbulent flow?
- What is Kirchhoff’s law?
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SECTION-B
- What is thermal diffusivity? Discuss its significance.
- Show that the temperature distribution in a plane wall without heat generation is linear.
- A black body emits the radiation at 2000K calculate its monochromatic emissive power at 1 um wavelength, wavelength at which emission is maximum and maximum emissive power.
- Derive the relationship for the heat transfer from the fin insulated at tip.
- What are Newtonian and non-Newtonian fluids? Give examples.
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SECTION-C
- The variation in the thermal conductivity of a material is given by K=K0 (1 + aT + ßT2), find the expression for the steady state heat transfer in wall of thickness L maintained at surface temperatures T1 and T2 (T1 > T2).
- Water is evaporated continuously at 100°C in an evaporator by cooling 500 kg of air per hour from 260°C to 150°C. Calculate the heat transfer surface area and steam evaporation per hour if liquid enters a 100°C. Take U=46 W/m2K, Cp=1.005 KJ/Kg K and hfg = 2257 KJ/Kg(at 100 °C).
- Discuss the various parameters that affects the engine heat transfer.
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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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