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MCQs

Total Questions : 2525 | Page 2 of 253 pages
Question 11. __________ paint has the maximum absorption coefficient.
  1.    Black
  2.    Yellow
  3.    White
  4.    Grey
 Discuss Question
Answer: Option A. -> Black
Question 12. A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun?
  1.    Yellow paint
  2.    White paint
  3.    Black paint
  4.    Grey paint
 Discuss Question
Answer: Option C. -> Black paint
Question 13. The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by
  1.    Εx + εy
  2.    Εx . εy
  3.    1/εx + 1/εy
  4.    (εx + εy)/(εx + εy - εx . εy)
 Discuss Question
Answer: Option D. -> (εx + εy)/(εx + εy - εx . εy)
Question 14. Heat transfer co-efficient (h1) for liquids increases with
  1.    Increasing temperature
  2.    Decreasing temperature
  3.    Decreasing Reynolds number
  4.    None of these
 Discuss Question
Answer: Option A. -> Increasing temperature
Question 15. Baffle spacing
  1.    Is not the same as baffle pitch
  2.    Should be less than one fifth the diameter of the shell
  3.    Should be less than the inside diameter of the shell
  4.    None of these
 Discuss Question
Answer: Option C. -> Should be less than the inside diameter of the shell
Question 16. In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.
  1.    Nucleate
  2.    Pool
  3.    Low pressure
  4.    None of these
 Discuss Question
Answer: Option B. -> Pool
Question 17. The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.
  1.    Kirchoffs
  2.    Planck's
  3.    Wien's displacement
  4.    Stefan-Boltzman
 Discuss Question
Answer: Option A. -> Kirchoffs
Question 18. Solid angle subtended by the finite surface at the radiating element is
  1.    Called the view factor
  2.    Called the angle of vision
  3.    Proportional to the square of the distance between surfaces
  4.    Expressed in terms of radians
 Discuss Question
Answer: Option B. -> Called the angle of vision
Question 19. Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called
  1.    Radiation
  2.    Natural convection
  3.    Forced convection
  4.    Conduction
 Discuss Question
Answer: Option C. -> Forced convection
Question 20. Agitated film evaporator is suitable for concentrating __________ liquids.
  1.    Foaming
  2.    Viscous
  3.    Very thin
  4.    Corrosive
 Discuss Question
Answer: Option B. -> Viscous

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