Q.1
14 Marks(a)
Explain thermal conductivity of gases, liquid and solids.
(b)
Enlist the property of Insulating material.
(c)
Explain in brief various laws of radiation.
Gujarat Technological UniversitySummer 2025 examination
GTU 3140503 Heat Transfer Summer 2025 Question Paper & PDF
B.E. · Chemical Engineering · Semester 4 · Subject code 3140503
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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Q.2
14 Marks(a)
Enlist different types of fins with neat sketch.
(b)
Derive an expression for heat flow through a cylinder.
(c)
A furnace is constructed with a 24 cm thick layer of fire brick, 12 cm thick layer of insulating brick and followed by a 24 cm thick layer of building brick. The inside temperature of the furnace is 950 °C and the outside temperature is 55 °C. The thermal conductivities of fire brick, insulating brick and building brick are 6.05, 0.59 and 2.4 W/(m °C). Find the heat loss per unit area and the temperature at the interfaces.
OR
(c)
Derive equation for heat transfer through a composite wall made up of 3 different materials in close thermal contact with each other, with no heat loss to surrounding.
Q.3
14 Marks(a)
Give the physical significance of Prandlt No., Nusselt No. and Grashoff No.
(b)
Explain natural convection phenomenon.
(c)
Using Dimension analysis derive expression for forced convection for the fluid flowing inside tube in a turbulent flow.
OR
(a)
Explain the terms absorptivity, emissivity, transmissivity and reflectivity for heat
transfer by radiation.
(b)
Define the black body and Give applications where this concept is used in heat transfer.
(c)
Discuss with the help of diagram various regimes of pool boiling. What is the use of finding critical flux and critical temperature drop?
Q.4
14 Marks(a)
Draw the temperature profiles of cold and hot fluids for true co-current and counter –current flow in double pipe heat exchanger.
(b)
Discuss the Concept of fin Effectiveness.
(c)
Derive the equation for LMTD and explain its importance.
OR
(a)
When LMTD correction factor is used in heat exchanger calculation?
(b)
Derive an equation for Overall heat transfer coefficient in double pipe heat exchanger.
(c)
Explain in details with neat sketch: Shell & Tube heat exchangers.
Q.5
14 Marks(a)
Define capacity and economy of evaporator.
(b)
Explain working of Vertical Tube Evaporator.
(c)
Derive the material and energy balances for multi effect evaporator.
OR
(a)
Differentiate between forward feed and backward feed in a multiple effect evaporator with a neat sketch.
(b)
Write short notes on Vapor recompression in evaporator.
(c)
Write a short note on Multiple Effect Evaporator
More Heat Transfer papers
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Other Semester 4 subjects
BE Chemical
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About this paper
Official Gujarat Technological University (GTU) examination paper for Heat Transfer (Summer 2025, B.E. · Chemical Engineering, Sem 4). 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.