Computational Fluid Dynamics Chemical Engineering MCQ - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. Lower BWG means __________ of the tube.
(A) Lower thickness
(B) Lower cross-section
(C) Outer diameter
(D) Inner diameter

2. Pick out the wrong statement.
(A) A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity
(B) Newton's law of viscosity is not applicable to the turbulent flow of fluid with linear velocity distribution
(C) Laminar flow of viscous liquids is involved in the lubrication of various types of bearings
(D) Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes

3. Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as
(A) V1.8
(B) V-0.2
(C) V2.7
(D) V2

4. Which of the following is a Newtonian fluid?
(A) Rubber latex
(B) Sewage sludge
(C) Quicksand
(D) Non-colloidal solution

5. During fluid flow, variation of shear stress (τ) with velocity gradient a (dv/dy) constant pressure temperature is shown below in the figure. In the figure, Bingham plastic is represented by the curve:

(A) V
(B) II
(C) III
(D) I

6. Centrifugal pumps as compared to reciprocating pumps
(A) Run at a lower speed for the same discharge
(B) Do not need priming
(C) Deliver fluid with pulsating/fluctuating discharge
(D) Can be run with discharge line valve closed for a short interval

7. In magnetic flow meters, voltage generation is
(A) Due to the motion of conducting fluid through an externally generated uniform field
(B) Proportional to the fluid velocity
(C) Both (a) and (b)
(D) Neither (a) nor (b)

8. Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter.
(A) 5
(B) 50
(C) 500
(D) 5000

9. The pressure co-efficient is the ratio of pressure forces to __________ forces.
(A) Viscous
(B) Inertial
(C) Gravity
(D) Surface tension

10. The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number.
(A) Increases
(B) Decreases
(C) Remain same
(D) May increase or decrease

11. Prandtl mixing length is
(A) Applicable to laminar flow problems
(B) A universal constant
(C) Zero at the pipe wall
(D) None of these

12. Drag co-efficient for flow past immersed body is the ratio of __________ to the product of velocity head and density.
(A) Shear stress
(B) Shear force
(C) Average drag per unit projected area
(D) None of these

13. Viscosity of water at 40°C lies in the range of
(A) 1 × 10-3 to 2 × 10-3 kg/m.s
(B) 0.5 × 10-3 to 1 × 10-3 kg/m.s
(C) 1 to 2 kg/m.s
(D) 0.5 to 1 kg/m.s

14. In continuous fluidization
(A) Solids are completely entrained
(B) The pressure drop is less than that for batch fluidization
(C) There is no entrainment of solids
(D) Velocity of the fluid is very small

15. Potential flow is characterized by the
(A) Irrotational and frictionless flow
(B) Irrotational and frictional flow
(C) One in which dissipation of mechanical energy into heat occurs
(D) Formation of eddies within the stream

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