Transmissivity MCQ

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• A body through which all the incident radiations passes, is called
  ক

  Opaque body

  খ

  Black body

  গ

  Transparent body

  ঘ

  White body
• With respect to incident radiation, transmissivity varies with
  ক

  Time

  খ

  Temperature

  গ

  Surface area

  ঘ

  Wavelength
• Radiant energy with an intensity of 800 W/m2 strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of transmission
  ক

  155.47 W/m2

  খ

  145.47 W/m2

  গ

  135.47 W/m2

  ঘ

  125.47 W/m2
• A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation
  ক

  11.04 W/m2 degree

  খ

  12.04 W/m2 degree

  গ

  13.04 W/m2 degree

  ঘ

  14.04 W/m2 degree
• Transmissivity is defined as
  ক

  Fraction of total energy transmitted by the body

  খ

  Fraction of total energy reflected by the body

  গ

  Fraction of total energy absorbed by the body

  ঘ

  Fraction of total energy absorbed and radiated by the body
• What is the wavelength band of gamma rays?
  ক

  1 * 10 -7 to 4 * 10 -4 micron meter

  খ

  2 * 10 -7 to 2.4 * 10 -4 micron meter

  গ

  3 * 10 -7 to 3.4 * 10 -4 micron meter

  ঘ

  4 * 10 -7 to 1.4 * 10 -4 micron meter
• A cavity with a small hole will always behave as a
  ক

  White body

  খ

  Transparent body

  গ

  Black body

  ঘ

  Opaque body
• Transmissivity can also be defined as a ratio of transmitted radiation to that of incident energy flow.
  ক

  True

  খ

  False
• Of the radiant energy 350W/m2 incident upon a surface 250W/m2 is absorbed, 60W/m2 is reflected and the remainder is transmitted through the surface. Workout the value for absorptivity for the surface material
  ক

  0.113

  খ

  0.114

  গ

  0.115

  ঘ

  0.116
• The value of transmissivity may vary from
  ক

  0-1

  খ

  1-2

  গ

  3-4

  ঘ

  4-5