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MCQs

Total Questions : 26 | Page 3 of 3 pages
Question 21. A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body
  1.    697.2 W/m²
  2.    786.9 W/m²
  3.    324.7 W/m²
  4.    592.1 W/m²
 Discuss Question
Answer: Option A. -> 697.2 W/m²
Answer: (a).697.2 W/m²
Question 22. Heat transfer takes place in liquids and gases is essentially due to
  1.    Radiation
  2.    Conduction
  3.    Convection
  4.    Conduction as well as convection
 Discuss Question
Answer: Option C. -> Convection
Answer: (c).Convection
Question 23. During a cold winter season, a person prefers to sit near a fire. Which of the following modes of heat transfer provides him the maximum heat?
  1.    Conduction from the fire
  2.    If it is near the fire, convection sounds good
  3.    Convection and radiation together
  4.    Radiation will provide quick warmth
 Discuss Question
Answer: Option D. -> Radiation will provide quick warmth
Answer: (d).Radiation will provide quick warmth
Question 24. The appropriate rate equation for convective heat transfer between a surface and adjacent fluid is prescribed by
  1.    Newton’s first law
  2.    Wein’s displacement law
  3.    Kirchhoff’s law
  4.    Newton’s law of cooling
 Discuss Question
Answer: Option D. -> Newton’s law of cooling
Answer: (d).Newton’s law of cooling
Question 25. Most unsteady heat flow occurs
  1.    Through the walls of the refrigerator
  2.    During annealing of castings
  3.    Through the walls of the furnace
  4.    Through lagged pipe carrying steam
 Discuss Question
Answer: Option B. -> During annealing of castings
Answer: (b).During annealing of castings
Question 26. Identify the wrong statement.
  1.    The process of heat transfer is an irreversible process
  2.    For heat exchange, a temperature gradient must exist
  3.    A material medium is not necessary for heat transmission
  4.    Heat flow doesn’t depends on temperature
 Discuss Question
Answer: Option D. -> Heat flow doesn’t depends on temperature
Answer: (d).Heat flow doesn’t depends on temperature

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