B.TechSemester 52025-26Heat Mass TransferBME501

Heat Mass Transfer (BME501) - AKTU Question Paper 2025-26

B.Tech · Semester 5 · Free PDF Download

This is the official AKTU Heat Mass Transfer Previous Year Question Paper for B.Tech Semester 5, academic session 2025-26. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 5

Session:2025-26

University:AKTU / UPTU

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Questions Asked in 2025-26

Heat Mass Transfer (BME501) — extracted question text · 70 marks · 3 Hours

Section AAttempt all q u e s t i o n s i n b r i e f . 02 x 7 = 14

a
Define conduction, convection and radiation with one example each
b
Thermal conductivity of copper is 400 W/mK. What heat flux occ urs across 5mm thickness when ∆T=30°C?
c
A composite wall has thermal resistances R1 and R2. Write expr ession for overall heat transfer coefficient
d
Define the Lumped Capacitance Method
e
Give expression for Reynolds number and calculate for air flow V=20m/s
f
What is the Stefan-Boltzmann law, and how does it relate to th e emissive power of a blackbody?
g
What is LMTD and how is it used i n heat exchanger design?

Section BAttempt any three o f t h e f o l l o w i n g : 07 x 3 = 21

a
Derive general heat conduction equation in rectangular coord inates and solve heat flux for a wall 0.2m thick and k=25W/mK with ΔT=80°C
b
Write expressions for the overall heat-transfer coefficient (U) for a composite wall under steady-state conduction
c
Using transient conduction re lations and Heisler chart, esti mate center temperature of a steel plate (20mm) initially 25°C placed in 20 0°C furnace for 5 min (given α)
d
Air at 1 atm and 25°C flows over surface at 50°C. Using Colb urn analogy determine heat transfer coefficient if friction coefficient=0.005
e
Radiation emissivity of a surface is 0.6. Calculate heat emi tted at 800K compared with blackbody

Section CAttempt any one p a r t o f t h e f o l l o w i n g : 07 x 1 = 07

a
Derive expression of critical i nsulation radius for cylinder and compute the radius for insulation k=0.12W/mK, air film h=10W/m²K
b
A cylinder of diameter 40mm is insulated with material (k=0. 08W/mK). Calculate critical radius and heat transfer rate for surface te mperature 120°C, ambient 30°C
a
Derive temperature distribution in a uniform fin and calcula te fin efficiency for L=120mm, k=200W/mK, h=25, t=4mm
b
A pin fin of diameter 10mm, length 100mm loses heat to air a t 25°C, base at 120°C, h=22W/m²K, k=150W/mK. Find heat dissipation
a
Derive laminar flat plate heat transfer expression and using it calculate h for air at 25°C flowing at 2m/s, x=0.4m. What is average coefficient?
b
A vertical plate at 100°C exposed to air at 25°C. Using Chur chill–Chu correlation, estimate heat transfer coefficient (properties given)
a
Explain shape factor and determine shape factor between two parallel plates of 1m² area separated by 0.1m
b
A radiation shield (ε=0.1) is placed between two plates at 6 00K and 300K. Calculate reduction in radiation heat transfer
a
A counter flow heat exchanger cools water from 80→40°C using oil from 30→60°C. Calculate NTU and effec tiveness for U=400W/m²K and area=20m²
b
Draw the heat flux curve for various regions of flow boiling

Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.

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