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3 of 25 questions on this paper were also asked in other years. Each is marked below with the years it appeared.See all 3 repeated 2151909 questions, most asked first
What is composite wall? Derive equation of overall heat transfer coefficient for composite cylindrical wall separating two fluids without heat generation for steady state condition.
Define fin efficiency and fin effectiveness. Explain why it is better to provide fin on gas side compared to liquid side.
Define critical Radius of insulation and derive its expression for cylindrical geometry.
A potato having mean diameter of 40 mm and initially at 25°C is placed in boiling water for 4 minutes and found to be boiled to the desired level. For how long should a similar potato should be boiled in the same environment and for the same level when taken from the cold storage at 10°C. Take the following properties for potato K=10 W/m oC, ρ = 1200 kg/m³, c = 2000 J/kg oC, h = 100 W/m²°C with usual notations and Use Lump Theory.
Discuss how hydrodynamic and thermal boundary layers are developed over a flat plate.
By dimensional analysis, show that for free convection Nusselt Number is a function of Grashoff Number and Prandtl Number.
Define Prandtl number. What is its physical significance? Show how its value affects thickness of hydraulic and thermal boundary layers.
Air stream at 25 oC is flowing at 0.4 m/s across a 100 W bulb having surface temperature 130 oC. if the bulb is approximated as by a 65 mm diameter sphere, Calculate
Define intensity of radiation and show that for a unit surface the intensity of normal radiation is 1/π times the total emissive power.
Discuss the electrical analogy for radiant heat transfer. Using electrical analogy derive equation of net radiation heat transfer between two non-black infinite parallel plates.
Also asked in Summer 2025 Q3c OR
Draw the temperature variations of hot and cold fluids along length of counter flow heat exchanger, evaporator and condenser. Discuss how heat capacity affects temperature variations.
Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.
BE Mechanical
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Official Gujarat Technological University (GTU) examination paper for Heat Transfer (Summer 2026, B.E. · Mechanical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.
2151909 Heat Transfer
Official GTU PDF · Summer 2026
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