B.TechSemester 52024-25Heat Mass TransferBME501
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Heat Mass Transfer (BME501) - AKTU Question Paper 2024-25

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 2024-25. 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:2024-25
University:AKTU / UPTU

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Questions Asked in 2024-25

Heat Mass Transfer (BME501) — complete question paper · 70 marks · 3 Hours

Section AAttempt all questions in brief. 2 x 07 = 14
  • a
    Define heat transfer and its i mportance in engineering
  • b
    List the factors affecting thermal conductivity
  • c
    Explain how extended surfaces e nhance heat transfer
  • d
    Differentiate between steady- state and transient heat conduction
  • e
    State the relation between fluid friction and heat transfer in forced convection
  • f
    State Planck’s law and its significance
  • g
    State the significance of fouli ng factors in heat exchangers
Section BAttempt any three of the following: 07 x 3 = 21
  • a
    Use the concept of critical ra dius to determine whether adding insulation increases or decreases heat loss
  • b
    Summarize the errors that occ ur in temperature measurement d ue to thermometer wells
  • c
    Apply the empirical heat transfer relation to calculate the heat transfer coefficient for natural convection over a vertical plate
  • d
    Determine the heat transfer ra te between two non-black surfa ces in an enclosure using the radiation network approach
  • e
    Describe the principle behi nd the LMTD method and also Compa re dropwise and filmwise condensation
Section CAttempt any one part of the following: 07 x 1 = 07
  • a
    Compare the heat conduction equations in rectangular, cylind rical, and spherical coordinates
  • b
    A plane wall is 150 mm thick and its wall area is 4.5 m². If i t s conductivity is 9.35 W/m°C and su rface temperatures are steady at 150°C and 45°C, determine: (i) Heat flow across the plane wall. (ii) Temperature gradient in the flow direction
  • a
    Identify the key assumptions made in the lumped capacitance method
  • b
    A 50cm × 50 cm copper slab 6. 25 mm thick has a uniform tempe rature of 300°C. Its temperature is sudde nly lowered to 36°C. Calculat e the time required for the plate to reach the temperature of 108°C. Take ρ= 9000kg/m 3, c = 0.38 kJ/kg°C, k = 370W /m°C and h = 90W
  • a
    Differentiate between laminar and turbulent flow heat transf er in natural convection
  • b
    Explain the analogy between mom entum and heat transfer in tu rbulent flow over a flat surface
  • a
    Compare the emissive propertie s of black bodies and gray bod ies with examples. Also assess the impact of surface geometry on shape f actors in radiation heat transfer
  • b
    A small sphere (outside diameter = 60 mm) with a surface tem perature of 300° C is located at the geometric centre of a large sphere (inside diameter = 360 mm) with an inner surface temperature of 15° C. Calculate how much of emission from the inner surface of the la rge sphere is incident upon the outer surface of the small sphere; assume that both sides approach black body behaviour. What is the net interchan ge of heat between the two spheres?
  • a
    Differentiate between the NTU and LMTD methods in terms of t heir applicability and advantages
  • b
    Two fluids, A and B exchange heat in a counter-current heat exchanger. Fluid A enters at 420°C and has a mass flow rate of 1 kg/s. Flu id B enters at 20°C and has a mass flow rate of 1 kg/s. Effectivenes s of heat exchanger is 75%. Determine: (i) The heat transfer rate. (ii) The exit temperature of fluid B. pecific heat of fluid A is 1 kJ/kg K and that of fluid B is 4 kJ/kg K

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

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