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Chemical Engineering :: Heat Transfer

Heat Transfer - Section 1
Heat Transfer - Section 2
Heat Transfer - Section 3
Heat Transfer - Section 4
Heat Transfer - Section 5
Heat Transfer - Section 6
Heat Transfer - Section 7
Heat Transfer - Section 8
Heat Transfer - Section 9
Heat Transfer - Section 10
Heat Transfer - Section 11

  1. A 2-4 heat exchanger involves

    2. A.
    only counter-flow of fluids.
    B.
    only parallel-flow of fluids.
    C.
    both counter and parallel-flow of the fluids.
    D.
    smaller pressure drop compared to 1-2 exchanger.

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  2. In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

    3. A.
    < 1
    B.
    > 1
    C.
    1
    D.
    ∞

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  3. With increase in temperature, the thermal conductivity of steel

    4. A.
    increases
    B.
    decreases
    C.
    remains unchanged
    D.
    increases exponentially

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  4. Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?

    5. A.
    Dittus-Boeltier equation
    B.
    Sieder-Tate equation
    C.
    Nusselt equation
    D.
    None of these

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  5. The main function of baffles provided in a shell and tube heat exchanger is to

    6. A.
    facilitate the cleaning of outer tube surface.
    B.
    enhance turbulence.
    C.
    hold the tubes in position.
    D.
    all 'a', 'b' & 'c'.

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  6. In a single effect evaporator, the economy is

    7. A.
    1
    B.
    < 1
    C.
    > 1
    D.
    none of these

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  7. Which of the following is not concerned with the heat transfer?

    8. A.
    Brinkman number
    B.
    Stanton number
    C.
    Schmidt number
    D.
    Peclet number

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  8. Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.

    9. A.
    180
    B.
    970
    C.
    3.97
    D.
    none of these

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  9. In counter flow compared to parallel flow,

    10. A.
    LMTD is greater.
    B.
    less surface area is required for a given heat transfer rate.
    C.
    both (a) and (b).
    D.
    more surface area is required for a given heat transfer rate.

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  10. The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is
    (Stefan-Boltzman constant = 5.67xl0-8 W/m2.K4)

    11. A.
    1000
    B.
    727
    C.
    800
    D.
    1200

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