Elements of Chemical Engineering Fluid Mechanics Questions & Answers - Set 29 - ObjectiveBooks

# Practice Test: Question Set - 29

1. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas).
(A) 1/√M
(B) √M
(C) 1/M
(D) M

2. For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is
(A) More
(B) Less
(C) Equal
(D) Either (a) or (b); depends on the viscosity of the fluid

3. The bulk modulus of elasticity of a liquid
(A) Is zero for incompressible liquid
(B) Decreases with pressure
(C) Is independent of temperature & pressure
(D) Increases with pressure

4. Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft.
(A) 40
(B) 34
(C) 8
(D) 37

5. The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a
(A) Weir
(B) Pitot tube
(C) Kennison nozzle
(D) V-notch

6. The terminal velocity of a particle moving through a fluid varies as dpn. The value of n is equal to __________ in Stoke's law regime.
(A) 1
(B) 0.5
(C) 2
(D) 1.5

7. The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the
(A) Inverse of fluid viscosity
(B) Square of particle size
(C) Difference in the densities of the particle & fluid
(D) All (a), (b) and (c)

8. Which is the correct relationship for a centrifugal pump? (Where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)
(A) D = 1840 H0.5/N
(B) D = 1840 N/H0.5
(C) H = 1840 D0.5/N
(D) D = 1840 H/N

9. The resistance wire used in a hot wire anemometer for conducting electrical current is made of
(A) Copper
(B) Tungsten
(C) Chromium
(D) Aluminium

10. Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump.
(A) Reciprocating
(B) Plunger
(C) Electromagnetic
(D) Gear

11. As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1
(A) Increases linearly with V
(B) Decreases linearly with V
(C) Decreases as V2
(D) None of these

12. Head developed by a centrifugal pump depends on its
(A) Speed
(B) Impeller diameter
(C) Both (a) and (b)
(D) Neither (a) nor (b)

13. The centre of pressure is
(A) Always below the centroid of the area
(B) Always above the centroid of the area
(C) A point on the line of action of the resultant force
(D) At the centroid of the submerged area

14. Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the
(A) Back flow of fluid in the event of stoppage of pump
(B) Discharge pressure
(C) Flow of liquid during operation of the pump
(D) All (a), (b) and (c)

15. The rate of shear versus the shear stress curves are time dependent for __________ fluid.
(A) Thixotropic
(B) Rheopectic
(C) Both (a) & (b)
(D) Neither (a) nor (b)

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