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MCQs

Total Questions : 2525 | Page 23 of 253 pages
Question 221. For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of
  1.    1
  2.    1.74
  3.    6.1
  4.    37
 Discuss Question
Answer: Option C. -> 6.1
Question 222. Harmonic mean temperature difference is given by
  1.    √(ΔT₁ . ΔT₂)
  2.    2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
  3.    2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
  4.    (ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)
 Discuss Question
Answer: Option B. -> 2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
Question 223. A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is
  1.    6000
  2.    24000
  3.    60000
  4.    48000
 Discuss Question
Answer: Option B. -> 24000
Question 224. Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?
  1.    35.5
  2.    43.75
  3.    81.25
  4.    48.25
 Discuss Question
Answer: Option C. -> 81.25
Question 225. For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy
  1.    d²T/dZ² > 0
  2.    d²T/dZ² = 0
  3.    d²T/dZ² < 0
  4.    dT/dZ = 0
 Discuss Question
Answer: Option B. -> d²T/dZ² = 0
Question 226. Among liquids, water has a comparatively high value of thermal conductivity, due to its
  1.    Low density
  2.    High viscosity
  3.    Partial ionisation
  4.    Dense structure
 Discuss Question
Answer: Option C. -> Partial ionisation
Question 227. Evaporation by thermocompression results in the
  1.    Saving of steam
  2.    Realisation of multiple effect economy in a single effect
  3.    Both A and B
  4.    None of these
 Discuss Question
Answer: Option C. -> Both A and B
Question 228. Which of the following is directly concerned with the heat transfer?
  1.    Strouhal number
  2.    Sherwood number
  3.    Euler number
  4.    Grashoff number
 Discuss Question
Answer: Option D. -> Grashoff number
Question 229. Boiling of milk in an open vessel is an example of __________ boiling.
  1.    Film
  2.    Sub-cooled
  3.    Saturated nucleate
  4.    None of these
 Discuss Question
Answer: Option A. -> Film
Question 230. Evaporator tubes are generally
  1.    Horizontal
  2.    Vertical
  3.    Inclined
  4.    Random
 Discuss Question
Answer: Option B. -> Vertical

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