Heat Transfer(Chemical Engineering ) Questions and Answers

Question 1. 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
Explanation:-
Answer: Option D. -> Both B and C
Question 2. 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
Explanation:-
Answer: Option A. -> Δt
Question 3. 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
Explanation:-
Answer: Option D. -> All of the above
Question 4. 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
Explanation:-
Answer: Option D. -> None of these
Question 5. 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)
Explanation:-
Answer: Option C. -> (ΔT)³
Question 6. For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.
  1.    Extremely low
  2.    Low
  3.    High
  4.    No
Explanation:-
Answer: Option C. -> High
Question 7. In case of evaporators, liquid entrainment results primarily due to
  1.    High vacuum in the evaporator
  2.    High evaporation rate
  3.    Foaming of the solution
  4.    High heat transfer rate
Explanation:-
Answer: Option C. -> Foaming of the solution
Question 8. Indirect contact heat exchangers are preferred over direct contact heat exchangers, because
  1.    Heat transfer co-efficient are high
  2.    There is no risk of contamination
  3.    There is no mist formation
  4.    Cost of equipment is lower
Explanation:-
Answer: Option B. -> There is no risk of contamination
Question 9. In a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the
  1.    Tube layout
  2.    Tube diameter
  3.    Tube pitch
  4.    No. of baffles
Explanation:-
Answer: Option B. -> Tube diameter
Question 10. __________ paint has the minimum absorption co-efficient.
  1.    Black
  2.    White lead
  3.    Grey
  4.    Light cream
Explanation:-
Answer: Option B. -> White lead
© Lakshya_Education.com, All Right Reserved.
Contact Us services