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    MCQs: The cooling of a metal ball of volume V, in large quantity of fluid is analogous to - (A) discharging of battery in an electric system - (B) discharging of capacitor in an electric system

    The cooling of a metal ball of volume V, in large quantity of flu...

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    The cooling of a metal ball of volume V, in large quantity of fluid is analogous to

    A. discharging of battery in an electric system

    B. discharging of capacitor in an electric system

    C. generation of heat in resistor in an electrical system

    D. none of the above

    Answer & Explanation

    Related Questions on Heat Transfer Questions

    Heat transfer deals with the rate of

    A. work transfer

    B. temperature transfer

    C. energy transfer

    D. none of the above

    View Answerr

    Which among the following has lowest thermal conductivity among the others?

    A. silver B. water C. mercury D. copper View Answerr

    In gases, the transfer of heat takes place by

    A. volumetric density

    B. transporting energy with free electrons

    C. unstable elastic collision

    D. random molecular collision

    View Answerr

    How does the heat transfer take place in metals?

    A. volumetric density

    B. transporting energy with free electrons

    C. unstable elastic collision d. random molecular collision

    D. None of the above

    View Answerr

    Internal energy of a substance is associated with

    A. microscopic modes of energy

    B. macroscopic modes of energy

    C. both a. and b.

    D. none of the above

    View Answerr

    More Related Questions on Heat Transfer Questions

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    Steady and Unsteady Heat Transfer

    Exercise Questions :: Heat Transfer

    »   General Heat Conduction Equation»   Modes of Heat Transfer»   Steady and Unsteady Heat Transfer»   Fourier Equation»   Thermal Conductivity of Materials

    21. What is the correct formula for The Biot number?

    A. hl/k B. k/hl C. l/hk D. hk/l

    22. What should be the Biot number to assume the body at uniform temperature?

    A. the Biot number should be less than 0.1

    B. the Biot number should be more than 0.1

    C. the Biot number should be equal to 0.1

    D. None of these

    23. The cooling of a metal ball of volume V, in large quantity of fluid is analogous to

    A. discharging of battery in an electric system

    B. discharging of capacitor in an electric system

    C. generation of heat in resistor in an electrical system

    D. None of these

    24. In convection heat transfer energy transfer takes place between

    A. two solid surfaces connected physically

    B. solid surface and fluid system in motion

    C. both a. and b. D. None of these

    25. What is the correct formula for the rate of heat transfer (q) from a surface of body of the area A to the surrounding fluid, when surface of the body is at temperature Ts and the surrounding fluid is

    A. q = k A (Ts – T∞)

    B. q = h A (Ts – T∞)

    C. q = (h/k) A (Ts – T∞)

    D. q = (1/h) A (Ts – T∞)

    «» Read More :

    » General Heat Conduction Equation

    » Modes of Heat Transfer

    » Steady and Unsteady Heat Transfer

    » Fourier Equation

    » Thermal Conductivity of Materials

    स्रोत : pak-mcqs.net

    Q. The cooling of a metal ball of volume V, in large quantity of fluid is analogous to

    MCQs: The cooling of a metal ball of volume V, in large quantity of fluid is analogous to - Mechanical Engineering Questions - Heat Transfer Questions

    MCQs: The cooling of a metal ball of volume V, in large quantity of fluid is analogous to

    discharging of battery in an electric system

    discharging of capacitor in an electric system

    generation of heat in resistor in an electrical system

    none of the above

    Answer & Explanation

    MCQs 1: If there are no externally induced flow velocities, then the Nusselt number (Nu) does not depend upon

    Prandtl number (Pr)

    Reynolds number (Re)

    Grashof number (Gr) none of the above

    Answer & Explanation

    MCQs 2: The Grashof number in natural convection plays same role as

    Prandtl number (Pr) in forced convection

    Reynolds number (Re) in forced convection

    Nusselt number (Nu) in forced convection

    none of the above

    Answer & Explanation

    MCQs 3: When is the arithmetic mean temperature difference of heat exchanger used instead of LMTD?

    when the temperature profiles of two fluids of heat exchanger are sloping downward with curve

    when the temperature profiles of two fluids of heat exchanger are sloping upward with curve

    when the temperature profiles of two fluids of heat exchanger are straight

    none of the above

    Answer & Explanation

    MCQs 4: How can the arithmetic mean temperature difference and LMTD of a same heat exchanger be compared?

    the arithmetic mean temperature difference is less than LMTD of a same heat exchanger

    the arithmetic mean temperature difference is more than LMTD of a same heat exchanger

    the arithmetic mean temperature difference and LMTD of a same heat exchanger are equal

    none of the above

    Answer & Explanation

    MCQs 5: For the same inlet and exit temperatures of two fluids, the LMTD for counterflow is always

    smaller than LMTD for parallel flow

    greater than LMTD for parallel flow

    same as LMTD for parallel flow

    unpredictable

    Answer & Explanation

    MCQs 6: In parallel flow heat exchangers,

    the exit temperature of hot fluid is always equal to the exit temperature of cold fluid

    the exit temperature of hot fluid is always less than the exit temperature of cold fluid

    the exit temperature of hot fluid is always more than the exit temperature of cold fluid

    we cannot predict comparison between exit temperatures of hot fluid and cold fluid

    Answer & Explanation

    MCQs 7: Consider a plane wall of finite thickness having energy generation in it. The sum of the rate of heat energy generation in the wall and rate of energy transfer by conduction into the wall is equal to

    rate of heat transfer by conduction out of the wall

    rate of heat transfer by convection out of the wall

    both a. and b. none of the above

    Answer & Explanation

    MCQs 8: What is the purpose of using fins in a particular heat transfer system?

    to decrease rate of heat transfer

    to increase rate of heat transfer

    to maintain rate of heat transfer at a constant rate

    cannot say

    Answer & Explanation

    MCQs 9: Temperature at the end tip of the fin having uniform cross-sectional area is

    maximum minimum

    similar to the heat generation temperature

    unpredictable

    Answer & Explanation

    MCQs 10: In the process of heat transfer through extended surfaces or fins, the entire surface area is at

    the same constant temperature

    different temperatures

    maximum base temperature

    minimum temperature

    Answer & Explanation

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