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MCQs

Total Questions : 2525 | Page 24 of 253 pages
Question 231. The actual temperature drop across the heating surface of an evaporator depends on the
  1.    Liquid depth over the heating surface
  2.    Solution being evaporated
  3.    Pressure difference between the steam chest and the vapor space above the boiling liquid
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 232. In Biot number, the characteristic length used is the ratio of the __________ of the solid.
  1.    Volume to surface area
  2.    Perimeter to surface area
  3.    Surface area to volume
  4.    Surface area to perimeter
 Discuss Question
Answer: Option A. -> Volume to surface area
Question 233. Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)
  1.    C/E
  2.    E/C
  3.    CE
  4.    1/CE
 Discuss Question
Answer: Option A. -> C/E
Question 234. Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low
  1.    Hardness
  2.    Dissolved soilds content
  3.    Suspended solids content
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 235. All analogy equations connecting friction factor and heat transfer co-efficient apply only to
  1.    Wall or skin friction
  2.    Form friction
  3.    Both A and B
  4.    Turbulent flow
 Discuss Question
Answer: Option A. -> Wall or skin friction
Question 236. The unit of heat transfer co-efficient in SI unit is
  1.    J/m²°K
  2.    W/m²°K
  3.    W/m°K
  4.    J/m°K
 Discuss Question
Answer: Option B. -> W/m²°K
Question 237. The main purpose of providing fins on heat transfer surface is to increase the
  1.    Temperature gradient
  2.    Mechanical strength of the equipment
  3.    Heat transfer area
  4.    Heat transfer co-efficient
 Discuss Question
Answer: Option C. -> Heat transfer area
Question 238. Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately
  1.    32
  2.    37
  3.    45
  4.    50
 Discuss Question
Answer: Option A. -> 32
Question 239. Multiple effect evaporation accounts for
  1.    Steam economy
  2.    Lower operating costs
  3.    Investment economy
  4.    None of these
 Discuss Question
Answer: Option A. -> Steam economy
Question 240. The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the
  1.    Heating volume
  2.    Heat transfer area
  3.    Nusselt number
  4.    None of these
 Discuss Question
Answer: Option B. -> Heat transfer area

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