Heat Transfer MCQs | Page - 3

Dear candidates you will find MCQ questions of Heat Transfer here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

πŸ“Š Heat Transfer
Q. It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30Β°C. The boiling point of the solution is 110Β°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/(kgK). The rate at which the heat has to be supplied in (kJ/min) to the evaporator is
  • (A) 3.06 Γ— 105
  • (B) 6.12 Γ— 105
  • (C) 7.24 Γ— 105
  • (D) 9.08 Γ— 105
πŸ’¬ Discuss
βœ… Correct Answer: (A) 3.06 Γ— 105
πŸ“Š Heat Transfer
Q. Fqra cold viscous feed, backward feed gives __________ than forward feed.
  • (A) A higher capacity
  • (B) A lower capacity
  • (C) Lower economy
  • (D) None of these
πŸ’¬ Discuss
βœ… Correct Answer: (A) A higher capacity
πŸ“Š Heat Transfer
Q. In a multi-pass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.
  • (A) Twice
  • (B) Four times
  • (C) Square root of
  • (D) Square of
πŸ’¬ Discuss
βœ… Correct Answer: (B) Four times
πŸ“Š Heat Transfer
Q. Terminal point temperature differences between fluids in case of a heat exchanger is termed as
  • (A) Approach
  • (B) Log mean temperature difference
  • (C) Arithmetic mean temperature difference
  • (D) Geometric mean temperature difference
πŸ’¬ Discuss
βœ… Correct Answer: (A) Approach
πŸ“Š Heat Transfer
Q. In a 1-1 cocurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is
  • (A) ∞
  • (B) 0
  • (C) Equal to the difference between hot and cold fluids inlet temperature
  • (D) Equal to the difference between hot fluid inlet temperature and cold fluid outlet temperature
πŸ’¬ Discuss
βœ… Correct Answer: (B) 0
πŸ“Š Heat Transfer
Q. When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.
  • (A) Pool
  • (B) Nucleate
  • (C) Transition
  • (D) Film
πŸ’¬ Discuss
βœ… Correct Answer: (D) Film
πŸ“Š Heat Transfer
Q. Boiling point elevation for a strong and concentrated solution is found by Duhring's rule, which states that at the same pressure, the boiling point of a solution is a linear function of the __________ of pure water.
  • (A) Density
  • (B) Kinematic viscosity
  • (C) Boiling point
  • (D) Dynamic viscosity
πŸ’¬ Discuss
βœ… Correct Answer: (C) Boiling point
πŸ“Š Heat Transfer
Q. The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.
  • (A) Viscosity
  • (B) Density
  • (C) Thermal conductivity
  • (D) Corrosive nature
πŸ’¬ Discuss
βœ… Correct Answer: (A) Viscosity
πŸ“Š Heat Transfer
Q. Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.)
  • (A) t
  • (B) 1/ρ
  • (C) 1/A
  • (D) All of the above
πŸ’¬ Discuss
βœ… Correct Answer: (D) All of the above
πŸ“Š Heat Transfer
Q. For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is
  • (A) 0.33
  • (B) 1
  • (C) 1.33
  • (D) 3
πŸ’¬ Discuss
βœ… Correct Answer: (B) 1

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