Solved question paper for HMT Dec-2020 (B-TECH 1st-2nd)
Solved Question Paper
Heat and Mass Transfer Dec-2020
PTU • B-TECH • Civil Engineering • 1st-2nd • Dec-2020
Heat and Mass Transfer previous year question papers on BRpaper are organized for students of Punjab Technical University’s Bachelor of Technology program, 1st-2nd semester. This section makes it easier to browse subject-wise old question papers for Heat and Mass Transfer, so students can review how questions are typically framed in past exams and get a sense of the exam pattern. Many students search for heat and mass transfer question paper with answers while preparing for exams, and this page is built to support exactly that kind of subject-wise browsing and revision. BRpaper is not the official website of Punjab Technical University or any institution, and it does not publish official notices or academic updates.
Solved Questions
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SECTION - B & C have FOUR questions each.Short Answer Dec-2020 • PTU B-TECH
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Select atleast TWO questions from SECTION - B & C.Short Answer Dec-2020 • PTU B-TECH
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Write briefly :Short Answer Dec-2020 • PTU B-TECH
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Define thermal diffusivity and explain its significance in heat tra nsfer.Short Answer Dec-2020 • PTU B-TECH
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May 2023 (a) Define thermal diffusivity and explain its significance in heat transfer.
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What is the logarithmic mean area for a hollow cylinder and sphere?Short Answer Dec-2020 • PTU B-TECH
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May 2023 (b) What is the logarithmic mean area for a hollow cylinder and sphere?
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Why the heat transfer coefficient for natural convection is much l ess than that for forced convection?Short Answer Dec-2020 • PTU B-TECH
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May 2023 (c) Why the heat transfer coefficient for natural convection is much less than that for forced convection?
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Explain the concept of forced convection heat transfer mechanism.Short Answer Dec-2020 • PTU B-TECH
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May 2023 (d) Explain the concept of forced convection heat transfer mechanism.
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Explain physical significance of Rayleigh number.Short Answer Dec-2020 • PTU B-TECH
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May 2023 (e) Explain physical significance of Rayleigh number.
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What do you understand by fouling of heat exchanger?Short Answer Dec-2020 • PTU B-TECH
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May 2023 (f) What do you understand by fouling of heat exchanger?
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How do you define the emissivity of a body?Short Answer Dec-2020 • PTU B-TECH
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May 2023 (g) How do you define the emissivity of a body?
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What is difference between black body and grey body.Short Answer Dec-2020 • PTU B-TECH
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May 2023 (h) What is difference between black body and grey body.
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Define velocity and thermal boundary layers?Short Answer Dec-2020 • PTU B-TECH
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May 2023 (i) Define velocity and thermal boundary layers?
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State the Fick’s law of diffusion. 2 | M-92765 (S2)-2803Short Answer Dec-2020 • PTU B-TECH
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May 2023 (j) State the Fick’s law of diffusion.
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Derive an expression for heat transfer in a solid cylinder with heat genera tion.Short Answer Dec-2020 • PTU B-TECH
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May 2023 Derive an expression for heat transfer in a solid cylinder with heat generation.
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Experimental results for heat transfer over a flat plate with an e xtremely rough surface were found to be correlated by an expression of the form Nux = 0.04 Re0.9 Pr1/3 Where Nu x is the local value of Nusselt number at a position x measured from the leading edge of the plate. Derive an expression for ratio of average heat tra nsfer coefficient to local heat transfer coefficient hx.Short Answer Dec-2020 • PTU B-TECH
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May 2023 Experimental results for heat transfer over a flat plate with an extremely rough surface were found to be correlated by an expression of the form Nux = 0.04 Re0.9 Pr1/3. Where Nux is the local value of Nusselt number at a position x measured from the leading edge of the plate. Derive an expression for ratio of average heat transfer coefficient to local heat transfer coefficient hx.
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A thermocouple is used to measure the temperature of gas flowing thro ugh a duct, records, 280°C. If the emissivity of the junction is 0.4 and convection coe fficient is 150W/m2.K. Find the true gas temperature. The duct wall temperature is 140° C. What should be the emissivity of the junction in order to reduce the error by 30%?Short Answer Dec-2020 • PTU B-TECH
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May 2023 A thermocouple is used to measure the temperature of gas flowing through a duct, records, 280°C. If the emissivity of the junction is 0.4 and convection coefficient is 150W/m^2.K. Find the true gas temperature. The duct wall temperature is 140°C. What should be the emissivity of the junction in order to reduce the error by 30%?
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By using dimensional analysis, develop a generalized empirical rela tion between Nusselt number, Reynolds number and Prandtl number for forced convection heat transfer.Short Answer Dec-2020 • PTU B-TECH
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May 2023 By using dimensional analysis, develop a generalized empirical relation between Nusselt number, Reynolds number and Prandtl number for forced convection heat transfer.
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Derive the generalised mass diffusion equation in Cartesian coordinates .Short Answer Dec-2020 • PTU B-TECH
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May 2023 Derive the generalised mass diffusion equation in Cartesian coordinates.
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The walls of a house, 4 m high, 5 m wide and 0.3 m thick are made fr om brick with thermal conductivity of 0.9 W/mK. The temperature of air inside the house i s 20°C and outside air is at - 10°C. There is a heat transfer coefficient of 10 W/ m2K on the inside wall and 30W/m 2K on the outside wall. Calculate the inside and outside wall temperatures, heat flux and total heat transfer rate through the wall.Short Answer Dec-2020 • PTU B-TECH
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May 2023 The walls of a house, 4 m high, 5 m wide and 0.3 m thick are made from brick with thermal conductivity of 0.9 W/mK. The temperature of air inside the house is 20°C and outside air is at - 10°C. There is a heat transfer coefficient of 10 W/m^2K on the inside wall and 30W/m^2K on the outside wall. Calculate the inside and outside wall temperatures, heat flux and total heat transfer rate through the wall.
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91 kg of water is to be heated from 10°C to 77°C with hot gases at 166°C flowing at 364kg/hr. Taking specific heat of gases =1.05 kj/kg - K, of water = 4.187 kj/kg - K an d the overall heat transfer coefficient = 114 W/m 2 - K, calculate the area of heat exchange surface required for a) parallel flow, b) counter flow.Short Answer Dec-2020 • PTU B-TECH
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May 2023 91 kg of water is to be heated from 10°C to 77°C with hot gases at 166°C flowing at 364kg/hr. Taking specific heat of gases = 1.05 kj/kg-K, of water = 4.187 kj/kg-K and the overall heat transfer coefficient = 114 W/m^2-K, calculate the area of heat exchange surface required for a) parallel flow.
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May 2023 91 kg of water is to be heated from 10°C to 77°C with hot gases at 166°C flowing at 364kg/hr. Taking specific heat of gases = 1.05 kj/kg-K, of water = 4.187 kj/kg-K and the overall heat transfer coefficient = 114 W/m^2-K, calculate the area of heat exchange surface required for b) counter flow.
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Write short notes on the following :Short Answer Dec-2020 • PTU B-TECH
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Mixed convectionShort Answer Dec-2020 • PTU B-TECH
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NTU method 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.Short Answer Dec-2020 • PTU B-TECH
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Answers about this subject, solved papers, and preparation.
01 Where can I find Heat and Mass Transfer previous year question papers for Bachelor of Technology, 1st-2nd semester?
This page lists Heat and Mass Transfer question papers uploaded for Punjab Technical University Bachelor of Technology, 1st-2nd semester, organized for subject-wise browsing where available.
02 Are these official Punjab Technical University question papers?
BRpaper is not the official website of Punjab Technical University. These papers are shared for reference and revision purposes only and are not official university material.
03 How can previous year Heat and Mass Transfer papers help in exam preparation?
Reviewing past papers can help you understand how questions are typically framed, notice commonly repeated topics, and get a sense of the exam pattern before your own exam.
04 What kind of topics does Heat and Mass Transfer usually cover?
The question papers here relate to the official Heat and Mass Transfer syllabus set by the university for this course and semester.
05 Does this page include a Heat and Mass Transfer question paper with answers or solved answers?
This page focuses on providing access to the previous year question papers themselves. A separate question bank or solved answers may not be available for every paper.
06 Can I find papers for other subjects in the same Bachelor of Technology?
Yes, BRpaper organizes papers by university, course, stream, and semester, so you can browse other subjects within the same Punjab Technical University Bachelor of Technology.