Theory Practice Chemical Engineering Fluid Mechanics - Set 22 - ObjectiveBooks
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# Practice Test: Question Set - 22

1. The continuity equation
(A) Relates mass flow rate along a stream tube
(B) Relates work and energy
(C) Stipulates that Newton's second law of motion must be satisfied at every point in the fluid
(D) None of these

2. One dimensional flow implies
(A) Flow in a straight line
(D) A flow which does not account for changes in transverse direction

3. The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its
(A) Viscosity
(B) Specific volume
(C) Velocity
(D) None of these

4. Non-colloidal solution is an example of the __________ fluid.
(A) Non-Newtonian
(B) Newtonian
(C) Dilatent
(D) Pseudo-plastic

5. In case of supersonic flow of a fluid through pipeline, the 'Mach number' is
(A) 0
(B) 1
(C) < 1
(D) > 1

6. A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below:
Δ P/L = 375 × 103 VOM + 10.94 × 106 V2OM (SI units)

If water is to be used as the fluidizing medium, the minimum fluidization velocity, VOM is

(A) 12 mm/s
(B) 16 mm/s
(C) 24 mm/s
(D) 28 mm/s

7. Gradually varied flow in open channel is a/an __________ flow.

8. For very low pressure and high discharge rate, the compressor used is a/an __________ compressor.
(A) Axial
(B) Reciprocating
(C) Rotary
(D) None of these

9. Stoke's law is valid, when NRe, p is less than
(A) 2
(B) 100
(C) 2100
(D) 700

10. The pressure head on sudden contraction in a horizontal pipe is converted into the __________ head.
(A) Elevation
(B) Velocity
(C) Both (a) & (b)
(D) Neither (a) nor (b)

11. Cavitation in a centrifugal pump can be avoided by keeping the
(A) Inlet pressure high
(B) Outlet pressure low
(C) Inlet pressure low
(D) Outlet pressure high

12. Rise of liquid in a capillary tube is due to
(A) Cohesion
(C) Both (a) & (b)
(D) Neither (a) nor (b)

13. Momentum transfer in laminar flow of fluids results due to the
(A) Viscosity
(B) Density
(D) None of these

14. The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the
(A) Static submergence
(B) Net positive suction head (NPSH)
(C) Cavitation sensitivity
(D) Priming

15. What is the ratio of fluid carrying capacity of two pipes having diameters d1 and d2 respectively?
(A) (d1/d2)0.8
(B) (d1/d2)0.5
(C) d1/d2
(D) (d1/d2)2

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