Lakshya Education MCQs

Question: The maximum heat transfer co-efficient from steam heating will be attained when the steam is
Options:
A.Supersaturated
B.Saturated
C.Wet
D.None of these
Answer: Option B

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Question 1. The rate of emission of radiation by a body does not depend upon the
  1.    Wavelength of radiation
  2.    Surface temperature of the body
  3.    Nature of the surface
  4.    Shape and porosity of the body
Answer: Option D
Question 2. In a multiple effect evaporator, the effect of boiling point elevation is to
  1.    Reduce the capacity
  2.    Reduce the economy
  3.    Increase the economy
  4.    None of these
Answer: Option A
Question 3. Which of the following is concerned with both heat and mass transfer?
  1.    Lewis relationship
  2.    Nusselt number
  3.    Kutateladze number
  4.    Froude number
Answer: Option A
Question 4. The main function of baffles provided in a shell and tube heat exchanger is to
  1.    Facilitate the cleaning of outer tube surface
  2.    Enhance turbulence
  3.    Hold the tubes in position
  4.    All of the above
Answer: Option B
Question 5. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
  1.    2
  2.    20.8
  3.    20.2
  4.    20.5
Answer: Option B
Question 6. The film co-efficient between condensing vapour and metal wall increases with
  1.    Increasing temperature of the vapour
  2.    Decreasing temperature of the vapour
  3.    Increasing viscosity of the film of condensate
  4.    Increasing temperature drop
Answer: Option A

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