B.TechSemester 52022-23Heat And Mass TransferKME501
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Heat And Mass Transfer (KME501) - AKTU Question Paper 2022-23

B.Tech · Semester 5 · Free PDF Download

This is the official AKTU Heat And Mass Transfer Previous Year Question Paper for B.Tech Semester 5, academic session 2022-23. 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:2022-23
University:AKTU / UPTU

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Questions Asked in 2022-23

Heat And Mass Transfer (KME501) — extracted question text

Section AAttempt all questions in brief. 2 x 10 = 20
  • a
    Explain the significance of Thermal Diffusivity
  • b
    Define Critical rad ius of insulation
  • c
    Explain the significance of B iot Number in transient heat conduction
  • d
    Why are fins installed on the outer surface of electric motors?
  • e
    Define Prandtl Number
  • f
    Define volume expansion coeffi cient and tell its significance in free convection
  • g
    Define the following- Em issivity, Emissive Power
  • h
    Explain black body and gray body. (i) State Fick’s Law of Mass diffusion. (j) Differentiate between the mec hanisms of film-wise and drop- wise condensation
Section BAttempt any three of the following: 10 x 3 = 30
  • a
    For a solid cylinder with uniform heat generation, derive t he following expressions- T= Ta + [qg.R/2h] + [qg.R2/4K{1-r/R)2}]
  • b
    State the assumptions made in Lumped Parametric analysis. F or transient heat conduction, derive the following- θ/θi = exp(-Bi.Fo) where θ= T-T
  • c
    Derive the Energy equation for thermal boundary layer over a flat plate
  • d
    What is radiation shield? Two large plate at temperatures 1 000 K and 600 K have emissivity of 0.5 and 0.8 respectively . A radiation shiel d having emissivity 0.1 on one side and 0. 05 on other side is paced betw een the plates. Determine the percentage reduction in heat transfer rate
  • e
    Explain working principle of Heat pipe with neat sketch. Di scuss pool boiling and also explain regimes of pool boiling with the help of diagram
Section CAttempt any one part of the following: 10 x 1 = 10
  • a
    Derive a general heat conduc tion equation for Cartesian co-ordinate
  • b
    Consider steady state heat conduction across the thickness in a plane composite wall (composed of two layers) exposed to convection conditions on both sides- hi=20W/m2K, ho=50W/m2K, Ti=200C ,To=-20C. The thermal conductivity and thickness of layer-1 are K1=20W/mK, L1=0.30 m. The thermal conductivity and t h i c k n e s s o f l a y e r - 2 a r e K2=50 W/mK, L 2= 0.15m. Determine interface temperature b/w two surfaces
  • a
    A copper sphere weighting 3 Kg is heated in a furnace to a temperature of 300oC and suddenly taken out and allowed to cool in ambient air at 25oC.If it takes 60 min. For copper sphere to cool down to 35 oC, what is the average surface heat transfer coefficient. Take density=8950 Kg/m3. Cp=0.383KJ/KgoC
  • b
    Illustrate the following- (i) What is meant by transient heat conduction? (ii) What are Heisler charts? What is their significance in transient heat conduction? (iii) What is response time of thermocouple?
  • a
    Draw thermal boundary layer over a flat plate. Explain the following dimensionless numbers- Nusselt Nu mber, Grashoff Number and Sta nton Number
  • b
    When 0.8 Kg of water per mi nute is passed through a tube of 20mm diameter. It is found to be heated from 22 oC to 50 oC . T h e h e a t i n g i s a c c o m p l i s h e d b y condensing steam on the surface o f tube. Surface of tube is mai ntained at constant temperature of 85oC. Determine the length of tube. For water at 60 oC- Cp=4.18 KJ/KgK, kinematic Viscosity= 0.568x10 -6 m 2/s, K=0.659W/mK, Density =983Kg/m3
  • a
    Define Radiation shape factor . Describe the various rules used in determination of radiation shape factor
  • b
    Explain the following radiat ion laws- Kirchhoff’s Law, Lamb erts Cosine Law, Wein’s Displacement Law, Planck’s Law
  • a
    Derive expression for LMTD (Logarithmic Mean Temperature Di fference) for
  • a
    parallel flow heat exchanger
  • b
    What is Fouling factor used in analysis of heat exchangers? 8000 kg/hr of air at 105oC is cooled by passing it throug h a counter flow heat exchanger . Find exit temperature of air if water enters at 15 oC and flows at the rate of 7500 kg/hr. U=145W/m2K, A=20m2.Solve by NTU method

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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