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MCQs

Total Questions : 2525 | Page 25 of 253 pages
Question 241. The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface)
  1.    K/h0
  2.    2K/h0
  3.    h0/K
  4.    h0/2K
 Discuss Question
Answer: Option B. -> 2K/h0
Question 242. Finned tube heat exchangers
  1.    Give larger area per tube
  2.    Use metal fins of low thermal conductivity
  3.    Facilitate very large temperature drop through tube wall
  4.    Are used for smaller heat load
 Discuss Question
Answer: Option A. -> Give larger area per tube
Question 243. The sum of reflectivity and absorptivity for an opaque body is equal to
  1.    0.5
  2.    1
  3.    0
  4.    2
 Discuss Question
Answer: Option B. -> 1
Question 244. For an ideal black body
  1.    Absorptivity = 1
  2.    Reflectivity = 1
  3.    Emissivity = 0
  4.    Transmissivity = 1
 Discuss Question
Answer: Option A. -> Absorptivity = 1
Question 245. Which of the following is not used as a medium for high temperature heating?
  1.    Dowtherm
  2.    Mercury
  3.    Liquid metal (e.g. molten sodium)
  4.    Fused salts (e.g., an eutectic mixture of 53% KNO₃, 40% NaNO₂and 7% NaNO₃)
 Discuss Question
Answer: Option B. -> Mercury
Question 246. Prandtl number for most of dry gases is about
  1.    0.001
  2.    0.72
  3.    70
  4.    150
 Discuss Question
Answer: Option B. -> 0.72
Question 247. Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?
  1.    Long vertical evaporator
  2.    Horizontal tube evaporator
  3.    Agitated film evaporator
  4.    Calenderia vertical tube evaporator
 Discuss Question
Answer: Option C. -> Agitated film evaporator
Question 248. Which of the following is the most widely used heat insulating material for pipelines carrying steam?
  1.    Tar dolomite bricks followed by asbestos
  2.    Fireclay refractory followed by aluminium sheet
  3.    Cotton followed by aluminium foil
  4.    85% magnesia cement and glass wool
 Discuss Question
Answer: Option D. -> 85% magnesia cement and glass wool
Question 249. Fouling factor
  1.    Is a dimensionless quantity
  2.    Does not provide a safety factor for design
  3.    Accounts for additional resistances to heat flow
  4.    None of these
 Discuss Question
Answer: Option C. -> Accounts for additional resistances to heat flow
Question 250. In SI units, fouling factor is expressed in
  1.    m²°K/W
  2.    W/m²°K
  3.    m²°K
  4.    m°K/W
 Discuss Question
Answer: Option A. -> m²°K/W

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