Chemical Engineering Fluid Mechanics Notes Questions - Set 30 - ObjectiveBooks

Chemical Engineering Fluid Mechanics Notes Questions - Set 30

Practice Test: Question Set - 30

1. At high Reynolds number
    (A) Inertial forces control and viscous forces are unimportant
    (B) Viscous forces predominate
    (C) Inertial forces are unimportant and viscous forces control
    (D) None of these

2. Very small pressure difference (< 5 mm water column) can be most conveniently measured by a/an __________ manometer.
    (A) U-tube water
    (B) U-tube mercury
    (C) Inclined tube mercury
    (D) Inclined tube water

3. Sewage sludge is __________ type of non-Newtonian fluid.
    (A) Dilatant
    (B) Bingham plastic
    (C) Pseudo plastic
    (D) None of these

4. The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.
    (A) Steady uniform
    (B) Steady non uniform
    (C) Unsteady uniform
    (D) Unsteady non uniform

5. In fluid flow, cavitation is caused, if the
    (A) Fluid velocity decreases to zero
    (B) Total energy decreases
    (C) Both (a) and (b)
    (D) Flow pressure approaches its vapor pressure at the prevailing temperature

6. In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.
    (A) Manometric
    (B) Mechanical
    (C) Volumetric
    (D) Overall

7. Cavitation can be prevented by
    (A) Suitably designing the pump
    (B) Maintaining the suction head sufficiently greater than the vapor pressure
    (C) Maintaining suction head = developed head
    (D) Maintaining suction head lower than the vapor pressure

8. A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.
    (A) Newtonian
    (B) Viscous
    (C) Dilatant
    (D) Non-viscous

9. For the transfer of solution of thick slurry, the pump used is a __________ pump.
    (A) Reciprocating
    (B) Gear
    (C) Diaphragm
    (D) Centrifugal

10. CdCc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena-contracta/area of opening), Cv = co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity).
    (A) Cd = Cc/Cv
    (B) Cd = Cc.Cv
    (C) Cd = Cv/ Cc
    (D) None of these

11. Bed pressure drop in an air fluidized bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is
    (A) 90
    (B) 60
    (C) 45
    (D) 30

12. A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is
    (A) 20 m/sec
    (B) 10 m/sec
    (C) 5 √2 m/sec
    (D) 5 m/sec

13. Shear stress in a fluid flowing in a round pipe
    (A) Varies parabolically across the cross-section
    (B) Remains constant over the cross-section
    (C) Is zero at the centre and varies linearly with the radius
    (D) Is zero at the wall and increases linearly to the centre

14. Pick out the Hagen-Poiseuille’s equation.
    (A) ∆p/ρ = 4f (L/D) (V2/2gc)
    (B) ∆p = 32 (µLV/gc. D2)
    (C) ∆p/L = 150 [(1 - ε)/ε3]. (µ.V02/g2cD)
    (D) ∆p/L = 1.75 [(1 - ε)/ε3]. (ρV02/gcDp)

15. Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)
    (A) d
    (B) 1/d
    (C) σ
    (D) 1/σ

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