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MCQs

Total Questions : 65 | Page 7 of 7 pages
Question 61. What is the value of overall heat transfer coefficient for steam condensers?
  1.    200-9000 W/m² K
  2.    3000-5500 W/m² K
  3.    2000-9500 W/m² K
  4.    1500-5000 W/m² K
 Discuss Question
Answer: Option D. -> 1500-5000 W/m² K
Answer: (d).1500-5000 W/m² K
Question 62. The engine oil at 150 degree Celsius is cooled to 80 degree Celsius in a parallel flow heat exchanger by water entering at 25 degree Celsius and leaving at 60 degree Celsius. Estimate the exchanger effectiveness
  1.    0.56
  2.    0.66
  3.    0.76
  4.    0.86
 Discuss Question
Answer: Option A. -> 0.56
Answer: (a).0.56
Question 63. Capacity ratio is defined as the product of
  1.    Mass and temperature
  2.    Mass and specific heat
  3.    Specific heat and temperature
  4.    Time and temperature
 Discuss Question
Answer: Option B. -> Mass and specific heat
Answer: (b).Mass and specific heat
Question 64. Which of the following is not associated with heat exchanger?
  1.    Fouling
  2.    NTU
  3.    Capacity ratio
  4.    Mc Adam’s correction factor
 Discuss Question
Answer: Option D. -> Mc Adam’s correction factor
Answer: (d).Mc Adam’s correction factor
Question 65. In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m² hr degree. Find the effectiveness of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg K
  1.    0.224
  2.    0.706
  3.    2.224
  4.    3.224
 Discuss Question
Answer: Option B. -> 0.706
Answer: (b).0.706

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