Lakshya Education MCQs

Question: Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.
Options:
A.Grashoff
B.Biot
C.Stantan
D.Reynolds
Answer: Option A

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Question 1. In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be
  1.    Less than 45°C
  2.    More than 45°C
  3.    Equal to 45°C
  4.    Initially decreases and remains constant thereafter
Answer: Option B
Question 2. In forced convection, the Nusselt number is a function of
  1.    Re and Pr
  2.    Re and Gr
  3.    Pr and Gr
  4.    Re and Sc
Answer: Option A
Question 3. The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m².K. At steady state, the temperature of the right face in °C is
  1.    77.2
  2.    71.2
  3.    63.8
  4.    48.7
Answer: Option D
Question 4. What is the unit of thermal conductivity ?
  1.    Kcal/hr. m² °C
  2.    Kcal/hr.m.°C
  3.    Kcal/hr.m
  4.    Kcal/hr. °C
Answer: Option B
Question 5. Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats
  1.    P and Q
  2.    P and R
  3.    P and S
  4.    R and S
Answer: Option C
Question 6. In a forward feed multiple effect evaporator unit
  1.    Viscosity of liquid is highest in first effect
  2.    Transfer from effect to effect is done by pumps
  3.    No pump is required to withdraw the product from the last effect
  4.    None of these
Answer: Option D

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