Chemical Engineering Fluid Mechanics Conceptual Questions - Set 26 - ObjectiveBooks

# Practice Test: Question Set - 26

1. When the momentum of one fluid is used for moving another fluid, such a device is called a/an
(A) Jet pump
(B) Blower
(C) Acid egg
(D) None of these

2. The equivalent diameter for flow through a rectangular duct of width B and height H is
(A) HB/2 (H + B)
(B) HB/(H + B)
(C) 2HB/(H + B)
(D) 4HB/(H + B)

3. The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is
(A) Parabolic
(B) Flat
(C) Flat near the wall and parabolic in the middle
(D) Parabolic near the wall and flat in the middle

4. Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the
(A) Temperature
(B) Pressure
(C) Both (a) & (b)
(D) Neither (a) nor (b)

5. In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of
(A) Relative roughness
(B) Absolute roughness
(C) Friction co-efficient for flows at equal Reynold number
(D) All (a), (b) & (c)

6. Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?
(A) At the centre
(B) At d/4 from the wall
(C) At the wall
(D) At d/8 from the wall

7. At a constant speed of the centrifugal pump, it’s __________ the impeller diameter.
(A) Capacity varies directly with
(B) Head varies as the square of
(C) Horsepower varies as the cube of
(D) All (a), (b) and (c)

8. Upto what value of 'Mach number', a fluid may be considered as incompressible?
(A) 0.03
(B) 0.3
(C) 3
(D) 10

9. Foot valves provided in pumps are __________ valves.
(A) Relief
(B) Three/four way
(C) Pressure reducing
(D) Directional control

10. Velocity distribution for flow between two fixed parallel plates
(A) Varies parabolically across the section
(B) Is constant over the entire cross-section
(C) Is zero at the plates and increases linearly to the mid-plane
(D) None of these

11. Which of the following can be used for the direct measurement of volumetric flow rate of slurry?
(A) Venturimeter
(B) Orificemeter
(C) Rotameter
(D) Pitot tube

12. Pick out the wrong statement:
(A) Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer
(B) Blowers develop a maximum pressure of 2 atmospheres
(C) Friction losses in pipe fittings are generally expressed in terms of velocity heads
(D) Fanning friction factor in case of turbulent flow of liquids in pipe depends upon relative roughness & Reynolds number

13. The dimension of dynamic viscosity is
(A) ML-1T-1
(B) L2T-1
(C) LT-2
(D) ML-1T-2

14. The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is
P. Inlet pressure
Q. Compressor rpm
R. Delivery pressure
S. Volumetric flow rate at inlet.
(A) P, Q and R
(B) P and R
(C) R and S
(D) P, R and S

15. In case of centrifugal fan or blower, the gas capacity varies as
(A) Speed
(B) (Speed)2
(C) (Speed)3
(D) (Speed)0.5

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