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MCQs

Total Questions : 448 | Page 37 of 45 pages
Question 361.  Depending on the radiating properties, a black body will be black when
  1.    ρ = 0, τ = 0 and α = 1
  2.    ρ = 1, τ = 0 and α = 0
  3.    ρ = 0, τ = 1 and α = 0
  4.    τ = 0, α+ρ = 1
 Discuss Question
Answer: Option A. -> ρ = 0, τ = 0 and α = 1
Question 362.  When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred to as heat transfer by
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    Conduction and convection
 Discuss Question
Answer: Option C. -> Radiation
Question 363.  Thermal conductivity of non-metallic amorphous solids with decrease in temperature
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    May increase or decrease depending on temperature
 Discuss Question
Answer: Option B. -> Decreases
Question 364. . Depending on the radiating properties, a white body will be white when
  1.    ρ = 0, τ = 0 and α = 1
  2.    ρ = 1, τ = 0 and α = 0
  3.    ρ = 0, τ = 1 and α = 0
  4.    τ = 0, α+ρ = 1
 Discuss Question
Answer: Option B. -> ρ = 1, τ = 0 and α = 0
Question 365.  The insulation ability of an insulator with the presence of moisture would
  1.    Increase
  2.    Decrease
  3.    Remain unaffected
  4.    May increase/decrease depending on temperature and thickness of insulation
 Discuss Question
Answer: Option B. -> Decrease
Question 366. . Which of the following is a case of steady state heat transfer
  1.    I.C. engine
  2.    Air preheaters
  3.    Heating of building in winter
  4.    None of the above
 Discuss Question
Answer: Option D. -> None of the above
Question 367. . Thermal conductivity of air with rise in temperature
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    May increase or decrease depending on temperature
 Discuss Question
Answer: Option A. -> Increases
Question 368. . Pick up the wrong case. Heat flowing from one side to other depends directly on
  1.    Face area
  2.    Time
  3.    Thickness
  4.    Temperature difference
 Discuss Question
Answer: Option C. -> Thickness
Question 369. . The wave length of the radiation emitted
  1.    Depends on temperature only
  2.    Depends on material of body
  3.    Does not depend on material of body
  4.    Both (A) and (C) above
 Discuss Question
Answer: Option D. -> Both (A) and (C) above
Question 370. . In heat exchangers, degree of approach is defined as the difference between temperatures of
  1.    Cold water inlet and outlet
  2.    Hot medium inlet and outlet
  3.    Hot medium outlet and cold water inlet
  4.    Hot medium outlet and cold water outlet
 Discuss Question
Answer: Option D. -> Hot medium outlet and cold water outlet

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