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MCQs

Total Questions : 448 | Page 30 of 45 pages
Question 291. The heat transfer by conduction through a thick sphere is given by
  1.    Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1)
  2.    Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1)
  3.    Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)
  4.    Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1)
 Discuss Question
Answer: Option C. -> Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)
Question 292. Pick up the wrong case. Heat flowing from one side to other depends directly on
  1.    Thickness
  2.    Face area
  3.    Temperature difference
  4.    Time
 Discuss Question
Answer: Option A. -> Thickness
Question 293. The value of the wavelength for maximum emissive power is given by
  1.    Wien’s law
  2.    Fourier's law
  3.    Planck's law
  4.    Stefan's law
 Discuss Question
Answer: Option A. -> Wien’s law
Question 294. A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as
  1.    U/A.Cmin
  2.    U.Cmin
  3.    U/Cmin
  4.    Cmin/U
 Discuss Question
Answer: Option C. -> U/Cmin
Question 295. The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is
  1.    Less than one
  2.    Equal to one
  3.    Equal to Nusselt number
  4.    Greater than one
 Discuss Question
Answer: Option B. -> Equal to one
Question 296. The emissivity for a black body is
  1.    0.5
  2.    0.75
  3.    1
 Discuss Question
Answer: Option C. -> 1
Question 297. Reynolds number is the ratio of
  1.    Inertia force to viscous force
  2.    Energy transferred by convection to that by conduction
  3.    Kinematic viscosity to thermal diffusivity
  4.    None of these
 Discuss Question
Answer: Option A. -> Inertia force to viscous force
Question 298. Thermal conductivity of water at 20°C is of the order of
  1.    0.51
  2.    0.1
  3.    0.42
  4.    0.23
 Discuss Question
Answer: Option A. -> 0.51
Question 299. If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of
  1.    3
  2.    81
  3.    9
  4.    270
 Discuss Question
Answer: Option B. -> 81
Question 300. Kirchhoff's law states that
  1.    The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
  2.    The wave length corresponding to the maximum energy is proportional to the absolute temperature
  3.    None of these
  4.    The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
 Discuss Question
Answer: Option D. -> The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body

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