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    HMTM MCQS

    Uploaded by

    Hamid Masood
    This document contains 15 multiple choice practice test questions related to heat transfer and thermodynamics. The questions cover topics such as insulation, thermal diffusivity, heat exchangers, heat transfer mechanisms, and fluid properties. For each question there is a correct multiple choice answer listed.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd

    HMTM MCQS

    Uploaded by

    Hamid Masood
    133 views6 pages
    This document contains 15 multiple choice practice test questions related to heat transfer and thermodynamics. The questions cover topics such as insulation, thermal diffusivity, heat exchangers, heat transfer mechanisms, and fluid properties. For each question there is a correct multiple choice answer listed.

    Original Description:

    hmtt mcqs will help u

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    This document contains 15 multiple choice practice test questions related to heat transfer and thermodynamics. The questions cover topics such as insulation, thermal diffusivity, heat exchangers, heat transfer mechanisms, and fluid properties. For each question there is a correct multiple choice answer listed.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    133 views6 pages

    HMTM MCQS

    Uploaded by

    Hamid Masood
    This document contains 15 multiple choice practice test questions related to heat transfer and thermodynamics. The questions cover topics such as insulation, thermal diffusivity, heat exchangers, heat transfer mechanisms, and fluid properties. For each question there is a correct multiple choice answer listed.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 6

    Practice Test: Question Set - 10

    1. Upto the critical radius of insulation,


    (A) Added insulation will increase heat loss
    (B) Added insulation will decrease heat loss
    (C) Convective heat loss will be less than conductive heat loss
    (D) Heat flux will decrease

    Correct Answer

    2. Unit of thermal diffusivity is


    (A) m/hr
    (B) m/hr C
    (C) kcal/m hr
    (D) kcal/m. hr C

    Correct Answer

    3. The rate of energy transferred by convection to that by conduction is called


    (A) Stanton number
    (B) Nusselt number
    (C) Biot number
    (D) Peclet number

    Correct Answer

    4. Thermal conductivity of wood depends on


    (A) Moisture
    (B) Density
    (C) Temperature
    (D) All of the above

    Correct Answer
    Answer: Option D

    5. A designer chooses the values of fluid flow rates and specific heats in such a
    manner that the heat capacities of the two fluids are equal. A hot fluid enters the
    counter flow heat exchanger at 100C and leaves at 60C. A cold fluid enters the
    heat exchanger at 40C. The mean temperature difference between the two fluids
    is
    (A) 20C
    (B) 40C
    (C) 60C
    (D) 66.7C

    Correct Answer

    6. The unit of overall coefficient of heat transfer is


    (A) W/mK
    (B) W/m
    (C) W/mK
    (D) W/m

    Correct Answer

    7. LMTD in case of counter flow heat exchanger as compared to parallel flow heat
    exchanger is
    (A) Higher
    (B) Lower
    (C) Same
    (D) Depends on the area of heat exchanger

    Correct Answer

    8. The transfer of heat by molecular collision is smallest in


    (A) Solids
    (B) Liquids
    (C) Gases
    (D) None of these

    Correct Answer

    9. In heat exchangers, degree of approach is defined as the difference between


    temperatures of
    (A) Cold water inlet and outlet
    (B) Hot medium inlet and outlet
    (C) Hot medium outlet and cold water inlet
    (D) Hot medium outlet and cold water outlet

    Correct Answer

    10. In a shell and tube heat exchanger, baffles are provided on the shell side to
    (A) Improve heat transfer
    (B) Provide support for tubes
    (C) Prevent stagnation of shell side fluid
    (D) All of these

    Correct Answer

    11. An ordinary passenger aircraft requires a cooling system of capacity.


    (A) 2 TR
    (B) 4 TR
    (C) 8 TR
    (D) 10 TR

    Correct Answer

    12. Joule sec is the unit of


    (A) Universal gas constant
    (B) Kinematic viscosity
    (C) Thermal conductivity
    (D) Planck's constant

    Correct Answer

    13. Fourier's law of heat conduction gives the heat flow for

    (A) Irregular surfaces


    (B) Nonuniform temperature surfaces
    (C) One dimensional cases only
    (D) Two dimensional cases only

    Correct Answer

    14. The value of Prandtl number for air is about


    (A) 0.1
    (B) 0.3
    (C) 0.7
    (D) 1.7

    Correct Answer

    15. The product of Reynolds number and Prandtl number is known as


    (A) Stanton number
    (B) Biot number
    (C) Peclet number
    (D) Grashoff number

    Correct Answer

    View All Answers


    (1) Answer: Option A (2) Answer: Option A (3) Answer: Option B (4) Answer: Option D (5) Answer: Option
    A (6) Answer: Option A (7) Answer: Option A (8) Answer: Option C (9) Answer: Option D (10) Answer:

    Option D (11) Answer: Option C (12) Answer: Option D (13) Answer: Option C (14) Answer: Option C (15)
    Answer: Option C

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