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MCQs

Total Questions : 2525 | Page 29 of 253 pages
Question 281. Heat waves
  1.    Can not pass through vacuum
  2.    Travel in straight line
  3.    Can be reflected by a mirror
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 282. Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger?
  1.    Tube side pressure drop and the heat transfer rate
  2.    Convective heat transfer co-efficient
  3.    Effective tube surface area for convective heat transfer
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 283. The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)
  1.    (ΔT)²
  2.    (ΔT)⁴
  3.    (ΔT)³
  4.    √(ΔT)
 Discuss Question
Answer: Option C. -> (ΔT)³
Question 284. Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger?
  1.    Corrosiveness
  2.    Fouling characteristic
  3.    Viscosity
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 285. For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)
  1.    Δt
  2.    Δt²
  3.    Δt³
  4.    √Δt
 Discuss Question
Answer: Option A. -> Δt
Question 286. __________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side.
  1.    Single pass, fixed tube sheet
  2.    U-tube
  3.    Three pass, fixed tube sheet
  4.    None of these
 Discuss Question
Answer: Option B. -> U-tube
Question 287. Which of the following has the highest thermal conductivity?
  1.    Brick
  2.    Air
  3.    Water
  4.    Silver
 Discuss Question
Answer: Option D. -> Silver
Question 288. Overall heat transfer co-efficient for cooling of hydrocarbons by water is about
  1.    50 -100 Kcal/hr.m².°C
  2.    50 -100 W/m² . °K
  3.    50 -100 BTU/hr. ft.2°F
  4.    1000 - 1500 BTU/hr. ft.2°F
 Discuss Question
Answer: Option C. -> 50 -100 BTU/hr. ft.2°F
Question 289. The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe )
  1.    K/h0
  2.    2K/h0
  3.    hi/K
  4.    2hi/K
 Discuss Question
Answer: Option A. -> K/h0
Question 290. Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)
  1.    √d
  2.    d
  3.    d2
  4.    d1.5
 Discuss Question
Answer: Option C. -> d2

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