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MCQs

Total Questions : 448 | Page 43 of 45 pages
Question 421. . Thermal diffusivity of a substance is
  1.    Proportional of thermal conductivity (k)
  2.    Inversely proportional to (k)2
  3.    Proportional to (k)2
  4.    None of the above
 Discuss Question
Answer: Option A. -> Proportional of thermal conductivity (k)
Question 422. . A non-dimensional number generally associated with natural convection heat transfer is
  1.    Grashof number
  2.    Nusselt number
  3.    Weber number
  4.    Prandtl number
 Discuss Question
Answer: Option A. -> Grashof number
Question 423. . Fourier's law of heat conduction is valid for
  1.    One dimensional cases only
  2.    Two dimensional cases only
  3.    Three dimensional cases only
  4.    Regular surfaces having non-uniform temperature gradients
 Discuss Question
Answer: Option A. -> One dimensional cases only
Question 424. . Emissivity of a white polished body in comparison to a black body is
  1.    Higher
  2.    Lower
  3.    Same
  4.    Depends upon the shape of body
 Discuss Question
Answer: Option B. -> Lower
Question 425. . Heat conducted through unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called
  1.    Thermal resistance
  2.    Thermal coefficient
  3.    Temperature gradient
  4.    Thermal conductivity
 Discuss Question
Answer: Option D. -> Thermal conductivity
Question 426. . According of Kirchhoff's law
  1.    Radiant heat is proportional to fourth power of absolute temperature
  2.    Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body
  3.    Emissive power and absorptivity are constant for all bodies
  4.    Ratio of emissive power to absorptive power is maximum for perfectly black body
 Discuss Question
Answer: Option B. -> Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body
Question 427. . Heat transfer in liquid and gases takes place by ?
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    Conduction and convection
 Discuss Question
Answer: Option B. -> Convection
Question 428. . The value of the wavelength for maximum emissive power is given by
  1.    Wien's law
  2.    Planck's law
  3.    Stefan's law
  4.    Fourier's law
 Discuss Question
Answer: Option A. -> Wien's law
Question 429. . Heat is closely related with
  1.    Liquids
  2.    Energy
  3.    Temperature
  4.    Entropy
 Discuss Question
Answer: Option C. -> Temperature
Question 430. . 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

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