Online Computer Test Chemical Engineering Fluid Mechanics - Set 21 - ObjectiveBooks

# Practice Test: Question Set - 21

1. The line traced by a single fluid particle as it moves over a period of time is called __________ line.
(A) Stream
(B) Path
(C) Equipotential
(D) None of these

2. In area meter (e.g., Rotameter), with increase in the fluid flow rate, the
(A) Pressure drop increases linearly
(B) Pressure drop is almost constant
(C) Area through which fluid flows does not vary
(D) None of these

3. While starting an axial flow pump, its delivery valve should be kept
(A) Open
(B) Closed
(C) Either open or closed
(D) None of these

4. In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller.
(A) Speed of
(B) Diameter of
(C) Fluid velocity leaving
(D) All (a), (b) and (c)

5. Which of the following is not an advantage of fluidization from transfer operation point of view?
(A) Intimate contact of the fluid with all parts of the solid particles
(B) Lower fluid pumping power requirement
(C) Minimization of temperature variation
(D) Prevention of particle segregation

6. Terminal velocity is
(A) A constant velocity with no acceleration
(B) A fluctuating velocity
(C) Attained after moving one-half of total distance
(D) None of these

7. What is the speed of sound (m/sec) in ordinary water?
(A) 1500
(B) 330
(C) 1000
(D) 3000

8. Drag co-efficient for motion of spherical particles in a stationary fluid in the stoke's law range is
(A) 24/NRe,P
(B) 16/NRe,P
(C) 64/NRe,P
(D) 48/NRe,P

9. Fanning friction factor is equal to (where, fB = Blasius friction factor).
(A) fB/4
(B) fB/2
(C) 4fB
(D) 2fB

10. In power law, ζ = [A (du/dy)2 + B] then the fluid is
(A) Newtonian
(B) Dilatant
(C) Thixotropic
(D) Rheopectic

11. __________ forces do not act in case of fluid flow.
(A) Elastic
(B) Tensile
(C) Vibratory
(D) Centrifugal

12. The schedule number of a pipe is an indication of its
(A) Size
(B) Roughness
(C) Material density
(D) Wall thickness

13. With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss
(A) Decreases
(B) Increases
(C) Remain constant
(D) Increases linearly

14. A fluid is a substance, that
(A) Has to be kept in a closed container
(B) Is almost incompressible
(C) Has zero shear stress
(D) Flows when even a small shear is applied to it

15. Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss?
(A) Flow nozzle
(B) Venturimeter
(C) Rotameter
(D) Orificemeter

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