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Transfer of Heat by Radiation Test - 2
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Transfer of Heat by Radiation Test - 2
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  • Question 1/9
    4 / -1

    Among the following methods of heat transfer, gravity does not play any part in

    Solutions

    Gravity does not play any part in radiation and conduction because in both these processes heat is transferred without any motion of the medium particles.

  • Question 2/9
    4 / -1

    The process by which heat is transferred from one place to another without heating the intervening medium is known as

    Solutions

    Radiation alludes to the mechanism in which heat is transmitted without any physical contact between objects. It uses electromagnetic waves for transfer of heat.

  • Question 3/9
    4 / -1

    The process by which heat flows from the region of higher temperature to the region of lower temperature by actual movement of material particles is called

    Solutions

    In this process, heat is transferred in the liquid and gases from a region of higher temperature to a region of lower temperature. Convection heat transfer occurs partly due to the actual movement of molecules or due to the mass transfer

  • Question 4/9
    4 / -1

    Mercury is a liquid which is heated by:

    Solutions

    Hg expands on heat (thermometers) it acts as a good conducting metal.

  • Question 5/9
    4 / -1

    What are units of K?

    Solutions

    K is the heat transfer coefficient.

    [] means units
    [Q/t] = W, [A] = L2, [d] = L, [T] = K

  • Question 6/9
    4 / -1

    Rate of conduction of heat depends on:

    Solutions

    The rate is given as dQ/dt = KAdT/dx

  • Question 7/9
    4 / -1

    Which of the given relation is true for Newton’s law of cooling?

    Solutions

    Newton's law of cooling states that the heat released by a body with respect to time (or) the rate of heat released is directly proportional to the difference between the body's temperature and the surrounding temperature. 
    dH/dt = k(T – Ts) where t = surrounding's temperature and T = temperature of the body 
    Consider two bodies A and B, of equal surface areas, such that A's temperature is more that B's temperature and the surrounding temperature is less than both A and B. Then according to Newton's law of cooling A loses more heat to the surroundings when compared B during the same time interval. So, A will cool faster than B.

  • Question 8/9
    4 / -1

    Which of the relation is true for the heat current?

    Solutions

    H = dQ/dt = KAdT/dx

  • Question 9/9
    4 / -1

    What is the expression for temperature gradient?

    Solutions

    A temperature gradient is a physical quantity that describes in which direction and at what rate the temperature changes the most rapidly around a particular location.
    The temperature gradient is a dimensional quantity expressed in units of degrees per unit length.
    The SI unit is kelvin per meter.
    Expression: ∆T/∆x, where ∆T = change in temperature and ∆x = change in distance

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