Heat Exchange Between Black Bodies MCQ

Test your knowledge with important Heat Exchange Between Black Bodies MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Heat Exchange Between Black Bodies MCQs at Bissoy

• Find the shape factor F 12 for the arrangement shown in the figure. The areas A 1 and A 2 are perpendicular but do not share the common edge
  ক

  0.03

  খ

  0.04

  গ

  0.05

  ঘ

  0.06
• The value of shape factor depends on how many factors?
  ক

  4

  খ

  1

  গ

  2

  ঘ

  3
• An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers are F 11 = 0.1 F 12 = 0.4 F 13 = 0.25 The surface areas A 1 and A 2 are 4 m2 and 2 m2. The view factor F 41 is
  ক

  0.50

  খ

  0.75

  গ

  0.1

  ঘ

  0.25
• Two long parallel surfaces, each of emissivity 0.7 are at different temperatures and accordingly have radiation exchange between them. It is desired to reduce 75% of this radiant heat transfer by inserting thin parallel shields of equal emissivity 0.7 on both sides. What should be the number of shields?
  ক

  2

  খ

  4

  গ

  1

  ঘ

  3
• The grey body shape factor for radiant heat exchange between a small body (emissivity = 0.4) in a large enclosure (emissivity = 0.5) is
  ক

  0.1

  খ

  0.2

  গ

  0.4

  ঘ

  0.5
• A thin shield of emissivity E 3 on both sides is placed between two infinite parallel plates of emissivities E 1 and E 2 and temperatures T 1 and T 2. If E 1 = E 2 = E 3, then the fraction radiant energy transfer without shield takes the value
  ক

  0.25

  খ

  0.50

  গ

  0.75

  ঘ

  1.25
• For the same type of shapes, the value of the radiation shape factor will be higher when
  ক

  Surfaces are closer

  খ

  Surfaces are larger and held closer

  গ

  Surfaces are moved further apart

  ঘ

  Surfaces are smaller and held closer
• The interchange factor is also known as
  ক

  Equivalent emissivity

  খ

  Irradiation

  গ

  Radiosity

  ঘ

  Shape factor
• The fraction of the radiative energy that is diffused from one surface element and strikes the other surface directly with no intervening reflections is called (i) Radiation shape factor (ii) Geometrical factor (iii) Configuration factor Choose the correct answer
  ক

  i only

  খ

  ii only

  গ

  i, ii and iii

  ঘ

  iii only
• Engineering problems of practical interest are involved with heat exchange between two or more surfaces, and this exchange is strongly dependent upon (i) Radiative properties (ii) Temperature levels (iii) Surface geometrics Identify the correct statements
  ক

  i and ii

  খ

  i and iii

  গ

  ii and iii

  ঘ

  i, ii and iii