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InsemAug 20252019 patternTE Mech

Heat & Mass Transfer (HMT) SPPU Insem Question Paper Aug 2025

All 4 questions from this SPPU insem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated HMT questions
Subject code
302042
Pattern
2019 pattern
Exam
Insem
Session
Aug 2025
Max. marks
30
Time
1 Hour
Semester
I
Paper code
[6579]-371

Printed for: T.E. (Mechanical / Mechanical S .W. ) (Insem)

Instructions to the candidates

  1. Answer Q.1 or Q.2, Q.3 or Q.4.
  2. Neat diagrams must be drawn wherever necessary.
  3. Figures to the right indicate full marks.
  4. Use of Calculator is allowed.
  5. Assume suitable data, if necessary.

Questions

  1. Q1

    1. a)

      Derive general heat conduction equation in Cartesian coordinates.

      [8]
    2. b)

      Describe the terms Thermal capacity and Thermal Diffusivity and Thermal contact resistance.

      [7]

  2. Q2

    1. a)

      A flat wall of furnace is made up of fire brick (k=1.4w/mºC), insulating brick (k=0.2w/m°C) and building brick (k=0.7w/m°C) of thickness 25cm, 12.5 cm and 25 cm respectively. The inside wall is at 600°C and the atmosphere is at 20°C, if the heat transfer coefficient for the outside surface is 10 W/m 2 °C, calculate: i) The loss of heat per m 2 of wall area ii) Temperature of outside wall surface of the furnace

      [8]
    2. b)

      List and discuss any three parameters from the list that affects thermal conductivity of solids.

      [7]

  3. Q3

    1. a)

      It is required to heat oil to about 350°C for frying purpose. A ladle is used of 4mm × 15mm cross-section. The surrounding is at 35°C. The conductivity of the material is 210 w/m°C, if the temperature should not reach to 45°C at distance of 400mm from the oil; determine the convective heat transfer coefficient.

      [8]
    2. b)

      What are Fourier and Biot Number? Explain the significance of Fourier and Biot Number. 2

      [7]

  4. Q4

    1. a)

      A copper slab of 400mm×400mm×5mm dimensions has a uniform temperature of 250°C. Its temperature is suddenly lowered to 30°C. Calculate the time required for the copper slab to reach 90°C. Assume convective heat transfer coefficient as 90 W/m 2 °C, assume following data for copper Density: 9000 kg/m 3 Specific heat: 380 J/kg °C Thermal conductivity: 370 w/m°C

      [8]
    2. b)

      Explain the following: i) Fin Efficiency ii) Fin Effectiveness 

      Also asked:Oct 2024

      [7]