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Mechanical Engineering :: Heat and Mass Transfer

Heat and Mass Transfer - section-1
  1. When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

    2. A.

     Black body
    B.

     Grey body
    C.

     Opaque body
    D.

     White body

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  2. The unit of Stefan Boltzmann constant is

    3. A.

     watt/cm3 °K
    B.

     watt/cm4 °K
    C.

     watt2/cm °K⁴
    D.

     watt/cm2 °K⁴

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  3. The unit of Stefan-Boltzmann constant is

    4. A.

     Watt/mK
    B.

     Watt/m2K2
    C.

     Watt/m2K4
    D.

     Watt/mK2

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