Fluid Mechanics MCQ Chemical Engineering - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics?
(A) Archimedes principle
(B) Newton's second law of motion
(C) Hooke's law
(D) Newton's third law of motion

2. Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around
(A) 2000
(B) 10
(C) 100
(D) 1000

3. Pick out the correct statement pertaining to transition/ entrance length in fluid flow.
(A) The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length
(B) Transition length for laminar flow of Newtonian fluids in a pipe of diameter 'd' is equal to 0.05. D.NRe
(C) Transition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter 'd' is equal to 50 D
(D) All (a), (b) and (c)

4. In the complete turbulence zone (in rough pipes), the
(A) Rough and smooth pipes have the same friction factor
(B) Laminar film covers the roughness projections
(C) Friction factor depends upon NRe only
(D) Friction factor is independent of the relative roughness

5. In a dry packed bed, the pressure drop will be changed by increasing the flow rate as
(A) V1.8
(B) V-0.8
(C) V
(D) V-1

6. What is the value of Fanning friction factor f ' for smooth pipe at NRe = 106 approximately?
(A) 0.003
(B) 0.01
(C) 0.1
(D) 0.3

7. Toothpaste is a
(A) Bingham plastic
(B) Pseudo-plastic
(C) Newtonian liquid
(D) Dilatent

8. For turbulent flow of an incompressible fluid through a pipe, the flow rate ‘Q’ is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is
(A) 1
(B) 0
(C) < 1
(D) > 1

9. Drag force on the float of a Rotameter is (where Q = flow rate of the)
(A)  Q
(B) Q
(C)  Q2
(D) Constant

10. A piezometer provided in the pipe measures
(A) Friction factor
(B) Static pressure
(C) Dynamic pressure
(D) None of these

11. The boundary layer is that part of a moving fluid, in which the fluid velocity is
(A) Affected by the fluid flow pressure
(B) Constant
(C) Affected by the presence of a solid boundary
(D) All (a), (b) and (c)

12. Which of the following equations is valid for laminar flow of a fluid through packed bed?
(A) Fanning equation
(B) Kozeny - Karman equation
(C) Hagen-Poiseuille equation
(D) Blake-Plummer equation

13. The Prandtl mixing length is
(A) Zero at the pipe wall and is a universal constant
(B) Independent of radial distance from the pipe axis
(C) Independent of the shear stress
(D) Useful for computing laminar flow problems

14. As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where, μ = fluid viscosity)
(A) 1/μ
(B) μ
(C) μ2
(D) 1/μ2

15. The ratio of actual discharge to theoretical discharge through an orifice is equal to
(A) Cc . Cv
(B) Cc . Cd
(C) Cv . Cd
(D) Cd/Cv

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