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MCQs

Total Questions : 448 | Page 11 of 45 pages
Question 101. The thermal diffusivities for solids are generally
  1.    Less than those for gases
  2.    Less than those for liquids
  3.    More than those for liquids and gases
  4.    More or less same as for liquids and gases
 Discuss Question
Answer: Option D. -> More or less same as for liquids and gases
Question 102. Heat transfer by radiation mainly depends upon
  1.    Its temperature
  2.    Nature of the body
  3.    Kind and extent of its surface
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 103. The transfer of heat by molecular collision is known as
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    None of these
 Discuss Question
Answer: Option B. -> Convection
Question 104. According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a
  1.    Grey body
  2.    Brilliant white polished body
  3.    Red hot body
  4.    Black body
 Discuss Question
Answer: Option D. -> Black body
Question 105. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is
  1.    0.45
  2.    0.55
  3.    0.40
  4.    0.75
 Discuss Question
Answer: Option A. -> 0.45
Question 106. The heat transfer takes place according to
  1.    Zeroth law of thermodynamics
  2.    First law of thermodynamics
  3.    Second law of thermodynamics
  4.    Kirchhoff's law
 Discuss Question
Answer: Option C. -> Second law of thermodynamics
Question 107. In case of liquids and gases, the heat transfer takes place according to
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    None of these
 Discuss Question
Answer: Option B. -> Convection
Question 108. Depending on the radiating properties, a body will be opaque when
  1.    P = 0, x = 0 and a = 1
  2.    P=1, x = 0 and a = 0
  3.    P = 0, x = 1 and a = 0
  4.    X = 0, a + p = 1
 Discuss Question
Answer: Option D. -> X = 0, a + p = 1
Question 109. Log mean temperature difference in case of counter flow compared to parallel flow will be
  1.    Same
  2.    More
  3.    Less
  4.    Depends on other factors
 Discuss Question
Answer: Option B. -> More
Question 110. In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
  1.    Convection
  2.    Radiation
  3.    Conduction
  4.    Both convection and conduction
 Discuss Question
Answer: Option C. -> Conduction

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