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Mechanical Engineering :: Heat and Mass Transfer

  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


  3. The unit of Stefan Boltzmann constant is

  4. A.

     watt/cm3 °K

    B.

     watt/cm4 °K

    C.

     watt2/cm °K⁴

    D.

     watt/cm2 °K⁴


  5. The unit of Stefan-Boltzmann constant is

  6. A.

     Watt/mK

    B.

     Watt/m2K2

    C.

     Watt/m2K4

    D.

     Watt/mK2