Chemical Engineering Fluid Mechanics Online Test - Set 19 - ObjectiveBooks

# Practice Test: Question Set - 19

1. Pick out the correct statement.
(A) Human blood is a Newtonian fluid
(B) A Newtonian fluid obeys Newton's law of cooling
(C) For a non-Newtonian fluid, a straight line passes through the origin in a plot between shear stress and shear gradient
(D) Thin lubricating oil is an example of a non-Newtonian fluid

2. Steady non-uniform flow is exemplified by flow through a/an
(A) Long pipe at constant rate
(B) Long pipe at decreasing rate
(C) Expanding tube at increasing rate
(D) Expanding tube at constant rate

3. Erosion and pits formation on the impeller of a centrifugal pump may be due to
(A) Cavitation
(B) Low speed of impeller
(C) Its operation with delivery valve closed for considerable time after starting the pump
(D) Off centering of pump with motor

4. The frictional resistance in laminar flow does not depend on the
(A) Area of surface in contact
(B) Flow velocity
(C) Fluid temperature
(D) Pressure of flow

5. Cavitation occurs in a centrifugal pump when the suction pressure is
(A) Less than the vapor pressure of the liquid at that temperature
(B) Greater than the vapor pressure of the liquid at that temperature
(C) Equal to the vapor pressure
(D) Equal to the developed head

6. Pick out the wrong statement about a streamline.
(A) It is always parallel to the main direction of the fluid flow
(B) It is a line across which there is no flow and it is equivalent to a rigid boundary
(C) Streamlines intersect at isolated point of zero velocity and infinite velocity
(D) The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity

7. Propellers are
(A) Axial flow mixers
(B) Low speed impeller
(C) Used for mixing liquids of high viscosity

8. The momentum correction factor for the velocity distribution of laminar flow is
(A) 1.3
(B) 1.66
(C) 2.5
(D) None of these

9. The range of a particular Rotameter can be increased by
(A) Use of floats of different densities
(B) No means
(C) Increasing the diameter of the float
(D) Decreasing the diameter of the float

10. __________ pumps are a group of vacuum pumps.
(A) Hyster
(B) Sump
(C) Mono
(D) Submerged

11. The value of critical Reynolds number for pipe flow is
(A) 1,300
(B) 10,000
(C) 100,000
(D) None of these

12. Differential manometer measures the
(A) Absolute pressure
(B) Gauge pressure
(C) Pressure difference

13. The contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is
(A) 0.1
(B) 0.5
(C) 0.94
(D) 1

14. With decrease in particle size to be fluidized by a particular fluid, the operating range of fluidization velocity
(A) Widens
(B) Squeezes
(C) Does not change
(D) Unpredictable from the data

15. In a stabilized soap bubble, pressure inside it compared to external pressure is
(A) More
(B) Less
(C) Same
(D) Unpredictable

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