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MCQs

Total Questions : 2525 | Page 30 of 253 pages
Question 291. In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.
  1.    Nucleate
  2.    Local
  3.    Pool
  4.    Saturated
 Discuss Question
Answer: Option B. -> Local
Question 292. Pick out the correct statement.
  1.    Higher is the temperature of the radiating body, higher is the wavelength of radiation
  2.    Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder
  3.    The wavelength corresponding to maximum mono-chromatic emissive power increases with rise in temperature
  4.    Solid angle subtended by the finite surface at the radiating element is called the angle of incidence
 Discuss Question
Answer: Option B. -> Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder
Question 293. Steam traps are provided in steam carrying pipelines to
  1.    Condense steam
  2.    Release excess steam pressure by bleeding steam
  3.    Remove condensate and inert gases
  4.    None of these
 Discuss Question
Answer: Option C. -> Remove condensate and inert gases
Question 294. Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that
  1.    There is no internal heat generation
  2.    Boundary surfaces are isothermal
  3.    Material is anisotropic
  4.    Constant temperature gradient exists
 Discuss Question
Answer: Option C. -> Material is anisotropic
Question 295. In sub-cooled boiling,
  1.    Temperature of the heating surface is less than the boiling point of the liquid
  2.    Temperature of the heating surface is more than the boiling point of the liquid
  3.    Bubbles from heating surface are absorbed by the mass of the liquid
  4.    Very large vapour space is necessary
 Discuss Question
Answer: Option B. -> Temperature of the heating surface is more than the boiling point of the liquid
Question 296. Presence of a non-condensing gas in a condensing vapour
  1.    Increases the rate of condensation
  2.    Decreases thermal resistance
  3.    Is desirable to increase the film co-efficient
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 297. Heat transfer by natural convection is enhanced in system with
  1.    High viscosity
  2.    High co-efficient of thermal expansion
  3.    Low temperature gradients
  4.    Low density change with temperature
 Discuss Question
Answer: Option B. -> High co-efficient of thermal expansion
Question 298. Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity?
  1.    Aluminium foil
  2.    Refractory bricks
  3.    Iron plate
  4.    Coke breeze
 Discuss Question
Answer: Option D. -> Coke breeze
Question 299. As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient
  1.    Continues to increase
  2.    Continues to decrease
  3.    Goes through a minimum
  4.    Goes through a maximum
 Discuss Question
Answer: Option C. -> Goes through a minimum
Question 300. A black body when hot, emits heat radiation of __________ wavelengths.
  1.    Small
  2.    Large
  3.    All
  4.    One fixed
 Discuss Question
Answer: Option C. -> All

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