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MCQs

Total Questions : 2525 | Page 253 of 253 pages
Question 2521. Pick out the wrong statement/
  1.    The emissivity of a surface decreases, if it gets corroded by atmospheric environment
  2.    The emissivity of a surface increases with increase in surface roughness
  3.    The emissivity of a polished surface is quite low
  4.    The emissivity of a non-metallic surface decreases with increase in the temperature
 Discuss Question
Answer: Option A. -> The emissivity of a surface decreases, if it gets corroded by atmospheric environment
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2522. Pick out the correct statement ?
  1.    1 kcal/hr.m.°C is equal to 1 BTU/hr. ft.°F
  2.    In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity
  3.    In unsteady state heat conduction, heat flows in the direction of temperature rise
  4.    In heat transfer by forced convection, Grashoff number is very important
 Discuss Question
Answer: Option B. -> In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2523. Pick out the wrong statement ?
  1.    Heat transfer from a hot body to cold body by the emission of heat waves is called radiation
  2.    Filmwise condensation takes place on non-wettable surfaces
  3.    The boiling point of a solution is affected by liquid head as well as boiling point elevation
  4.    None of these
 Discuss Question
Answer: Option B. -> Filmwise condensation takes place on non-wettable surfaces
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2524. Baffles are provided in heat exchangers to____________?
  1.    Remove dirt
  2.    Increase heat transfer rate
  3.    Reduce vibrations
  4.    Reduce heat transfer rate
 Discuss Question
Answer: Option B. -> Increase heat transfer rate
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2525. Maximum heat transfer rate can be expected in case of_________?
  1.    Laminar flow
  2.    Co-current flow
  3.    Turbulent flow
  4.    Heat flow rate is independent of nature of flow
 Discuss Question
Answer: Option C. -> Turbulent flow
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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