Skip to content
EndsemMay 20232019 patternTE Mech

Heat & Mass Transfer (HMT) SPPU Endsem Question Paper May 2023

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated HMT questions
Subject code
302042
Pattern
2019 pattern
Exam
Endsem
Session
May 2023
Max. marks
70
Time
2½ Hours
Semester
I
Paper code
[6003]-421

Printed for: T.E. (Mechanical /Mechanical Sandwich Engg.)

Instructions to the candidates

  1. Answer Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
  2. Figures to the right indicate full marks.

Questions

  1. Q1

    1. a)

      Explain briefly various regimes in pool boiling with sketch of typical pool boiling curve.

      [6]
    2. b)

      Explain the following Non-dimensional numbers i) Reynold Number ii) Grashoff Number

      Also asked:May 2024

      [4]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [8]

  2. Q2

    1. a)

      Distinguish between filmwise and dropwise condensation

      Also asked:May 2024

      [4]
    2. b)

      Explain the thermal boundary layer formation for flow over a flat plate with sketch.

      [6]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [8]

  3. Q3

    1. a)

      Explain following Laws of Radiation i) Stefan - Boltzmann Law ii) Plank’s Law iii) Kirchoff’s Law iv) Wein’s Displacement Law

      Also asked:Nov 2025 ·Nov 2023

      [8]
    2. b)

      The radiation shape factor of the circular surface of a thin hollow cylinder of 10 cm diameter and 10 cm length is 0.1716. What is the shape factor of the curved surface of the cylinder with respect to ifself?

      [4]
    3. c)

      Two parallel plates have emissivity of 0.8 and 0.5. A radiation shield having same emissivity on both sides is placed between them. Calculate the emissivity of the shield in order to reduce the radiation losses form system to one tenth of that of without shield.

      [5]

  4. Q4

    1. a)

      Explain the following terms i) Gray Body ii) Monochromatic emissivity iii) Radiation Intensity iv) Radiocity

      [8]
    2. b)

      A Furnace Cavity which is in the form of cylinder of 75mm diameter and 150 mm length is open at one end to large surrounding that is at 27 °C. The curved surface -3 and bottom surface-2 are aproximated as black surfaces and electrically heated The curved surface -3 and bottom surface -2 are maintained at 1350°C and 1650 °C respectively and outer surfaces are well insulated. Take view factor-F23 = 0.06. Estimate heat loss by radiation from opening-1 of the furnace

      [4]
    3. c)

      A pipe carrying steam, having an outside diameter of 20cm runs in a large room and is exposed to air at a temperature of 30 °C. The pipe surface temperature is 200°C Find the total heat lost per meter length of the pipe taking the emissivity of the pipe surface as 0.8 and convective heat transfer coefficient as 7W/m 2 °C. 3

      [5]

  5. Q5

    1. a)

      State and Explain Fick’s Law of Diffusion

      Also asked:Nov 2025 ·May 2024 ·Nov 2023 ·Jul 2022

      [6]
    2. b)

      A vessel contains a binary mixture of O 2 and N 2 with partial pressure in the ratio 0.21 and 0.79 at 15 °C. The total pressure oif the mixture is 1.1 bar. Calculate the following i) Molar concentrations ii) Mass densities iii) Mass fractions and iv) Molar fraction of each species

      [8]
    3. c)

      Write applications of mass transfer

      Also asked:May 2024

      [4]

  6. Q6

    1. a)

      Derive the general mass transfer equation in cartesian coordinates.

      [6]
    2. b)

      This part has equations that don’t show as text. Open the PDF to read it.

      [8]
    3. c)

      Explain modes of mass transfer

      Also asked:May 2024

      [4]

  7. Q7

    1. a)

      Derive an expression for Logarithmic Mean Temperature Difference (LMTD) for parallel flow heat exchanger.

      Also asked:Nov 2025 ·May 2024 ·Nov 2023 ·Jul 2022

      [6]
    2. b)

      Draw temperature profile diagrams for parallel flow heat exchanger and condenser.

      [4]
    3. c)

      In a double pipe heat exchanger hot water flows at the rate of 5000kg/h and gets cooled from 95°C to 65°C. At the same time 50000kg/h of cooling water at 30°C enters heat exchanger. The flow conditions are such that overall heat transfer coefficient remains constant at 2270 W/m 2 K. Determine the heat transfer area required and the effectiveness, assuming two streams are in parallel flow. Assume for both the streams C p =4.2 KJ/kg K. 4

      [7]

  8. Q8

    1. a)

      Derive an expression for effectiveness for parallel flow heat exchanger in terms of heat capacity ratio (C min /C max ) and Number of Transfer Unit (NTU)

      Also asked:Nov 2025 ·May 2024

      [6]
    2. b)

      What are the types of heat exchanger?

      [4]
    3. c)

      A counter-flow double pipe heat exchanger using superheated steam is used to heat water at the rate of 10500kg/h. The stem enters the heat exchanger at 180°C and leaves at 130°C. The inlet and exit temperatures of water are 30°C and 80°C respectively. If Overall Heat Transfer Coefficient from steam to water are 30°C and 80°C respectively. If over- all heat transfer coefficient from steam to water is 814W/m 2 °C, Calculate the heat transfer area. What would be the increase in area if the fluid flows were parallel? 

      Also asked:Jul 2022

      [7]