Fluid Mechanics(Chemical Engineering ) Questions and Answers

Question 1. In an incompressible flow of fluid, the fluid
  1.    Temperature remains constant
  2.    Compressibility is greater than zero
  3.    Density does not change with pressure & temperature
  4.    Is frictionless
Explanation:-
Answer: Option C. -> Density does not change with pressure & temperature
Question 2. The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10⁻⁶m²/s).
  1.    24000
  2.    24
  3.    0.24
  4.    0.44
Explanation:-
Answer: Option D. -> 0.44
Question 3. The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is
  1.    < 1
  2.    1
  3.    > 1
  4.    2
Explanation:-
Answer: Option A. -> < 1
Question 4. Dimension of kinematic viscosity is
  1.    MLT⁻¹
  2.    L² . T⁻¹
  3.    L²T
  4.    L² . T⁻²
Explanation:-
Answer: Option B. -> L² . T⁻¹
Question 5. The dimension of kinematic viscosity is
  1.    ML⁻²T⁻¹
  2.    L²T⁻¹
  3.    ML⁻²T⁻²
  4.    None of these
Explanation:-
Answer: Option B. -> L²T⁻¹
Question 6. A hydraulic accumulator comprises of
  1.    A storage device and a control valve
  2.    A cylinder and a plunger
  3.    Two pistons and two cylinders
  4.    A storage tank and a ram pump
Explanation:-
Answer: Option B. -> A cylinder and a plunger
Question 7. The capacity of a centrifugal pump Can be increased by increasing the
  1.    Impeller diameter or speed
  2.    Number of pumps and joining them in series
  3.    Number of pumps and joining them in parallel
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 8. The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm².
  1.    1000
  2.    2000
  3.    3000
  4.    4000
Explanation:-
Answer: Option D. -> 4000
Question 9. Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time't'. α = a co-efficient to be experimentally determined)?
  1.    ε = ε0 + α.t
  2.    ε = ε0 + α.t²
  3.    ε = ε0 + α.t³
  4.    ε = ε0 + α.t⁴
Explanation:-
Answer: Option A. -> ε = ε0 + α.t
Question 10. It is possible to integrate an automatic flow controller to a
  1.    Flow nozzle
  2.    Venturimeter
  3.    Rotameter
  4.    None of these
Explanation:-
Answer: Option C. -> Rotameter
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