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MCQs

Total Questions : 448 | Page 4 of 45 pages
Question 31. The most commonly used method for the design of duct size is the
  1.    Velocity reduction method
  2.    Equal friction method
  3.    Static regains method
  4.    Dual or double method
 Discuss Question
Answer: Option C. -> Static regains method
Question 32. The value of Prandtl number for air is about
  1.    0.1
  2.    0.3
  3.    0.7
  4.    1.7
 Discuss Question
Answer: Option C. -> 0.7
Question 33. A steam pipe is to be insulated by two insulating materials put over each other. For best results
  1.    Better insulation should be put over pipe and better one over it
  2.    Inferior insulation should be put over pipe and better one over it
  3.    Both may be put in any order
  4.    Whether to put inferior OIL over pipe or the better one would depend on steam temperature
 Discuss Question
Answer: Option A. -> Better insulation should be put over pipe and better one over it
Question 34. Sensible heat is the heat required to
  1.    Change vapour into liquid
  2.    Change liquid into vapour
  3.    Increase the temperature of a liquid of vapour
  4.    Convert water into steam and superheat it
 Discuss Question
Answer: Option C. -> Increase the temperature of a liquid of vapour
Question 35. Total heat is the heat required to
  1.    Change vapour into liquid
  2.    Change liquid into vapour
  3.    Increase the temperature of a liquid or vapour
  4.    Convert water into steam and superheat it
 Discuss Question
Answer: Option D. -> Convert water into steam and superheat it
Question 36. When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    Conduction and convection
 Discuss Question
Answer: Option C. -> Radiation
Question 37. When heat is transferred by molecular collision, it is referred to as heat transfer by
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    Scattering
 Discuss Question
Answer: Option B. -> Convection
Question 38. Stefan Boltzmann law is applicable for heat transfer by
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    Conduction and radiation combined
 Discuss Question
Answer: Option C. -> Radiation
Question 39. A non-dimensional number generally associated with natural convection heat transfer is
  1.    Grashoff number
  2.    Nusselt number
  3.    Weber number
  4.    Prandtl number
 Discuss Question
Answer: Option A. -> Grashoff number
Question 40. The unit of overall coefficient of heat transfer is
  1.    kcal/m²
  2.    kcal/hr °C
  3.    kcal/m² hr °C
  4.    kcal/m hr °C
 Discuss Question
Answer: Option C. -> kcal/m² hr °C

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