Fluid Mechanics for Chemical MCQs

724 MCQs  — Chemical Engineering MCQs  (Page 37 of 73)

Attempt Fluid Mechanics for Chemical Quiz
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
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Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________?
A. D
B. 1/d
C. Ζ
D. 1/ζ
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Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?
A. Flow rate
B. Mean velocity
C. Both ‘a’ & ‘b’
D. Neither ‘a’ nor ‘b’
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A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is________________?
A. 4.4 kpa
B. 2.94 kpa
C. 3.7 kpa
D. None of these
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Which of the following denotes the effect of compressibility in fluid flow ?
A. Weber number
B. Mach number
C. Euler number
D. Reynolds number
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Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will______________________?
A. Increase
B. Decrease
C. Remain same
D. Data insufficient to predict pressure drop
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The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is_____________________?
A. 0.5
B. 1
C. 1.5
D. 2
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Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time’t’. α = a co-efficient to be experimentally determined) ?
A. Ε = ε0 + α.t
B. Ε = ε0 + α.t2
C. Ε = ε0 + α.t3
D. Ε = ε0 + α.t4
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______________ pumps are axial flow pumps?
A. Turbine
B. Propeller
C. Diffuser
D. None of these
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In a fully turbulent flow (Re > 105) in a pipe of diameter ‘d’, for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is_______________?
A. D
B. D2
C. D2.5
D. D4
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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