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MCQs

Total Questions : 448 | Page 8 of 45 pages
Question 71. The highest thermal diffusivity is of
  1.    Iron
  2.    Lead
  3.    Concrete
  4.    Wood
 Discuss Question
Answer: Option B. -> Lead
Question 72. Thermal conductivity of water _________ with rise in temperature.
  1.    Remain same
  2.    Decreases
  3.    Increases
  4.    May increase or decrease depending upon temperature
 Discuss Question
Answer: Option D. -> May increase or decrease depending upon temperature
Question 73. The rate of energy transferred by convection to that by conduction is called
  1.    Stanton number
  2.    Nusselt number
  3.    Biot number
  4.    Peclet number
 Discuss Question
Answer: Option B. -> Nusselt number
Question 74. Which of the following property of air does not increase with rise in temperature?
  1.    Thermal conductivity
  2.    Thermal diffusivity
  3.    Density
  4.    Dynamic viscosity
 Discuss Question
Answer: Option C. -> Density
Question 75. Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of
  1.    1:1
  2.    2: 1
  3.    1: 2
  4.    4: 1
 Discuss Question
Answer: Option C. -> 1: 2
Question 76. Thermal conductivity of glass wool varies from sample to sample because of variation in
  1.    Composition
  2.    Density
  3.    Porosity
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 77. Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by
  1.    Convection
  2.    Radiation
  3.    Forced convection
  4.    Free convection
 Discuss Question
Answer: Option B. -> Radiation
Question 78. According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
  1.    Absolute temperature
  2.    Square of temperature
  3.    Fourth power of absolute temperature
  4.    Fourth power of temperature
 Discuss Question
Answer: Option C. -> Fourth power of absolute temperature
Question 79. The critical radius is the insulation radius at which the resistance to heat flow is
  1.    Maximum
  2.    Minimum
  3.    Zero
  4.    None of these
 Discuss Question
Answer: Option B. -> Minimum
Question 80. The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as
  1.    Conduction
  2.    Free convection
  3.    Forced convection
  4.    Radiation
 Discuss Question
Answer: Option C. -> Forced convection

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