Chemical Engineering Mcqs

For a particle settling in water at its terminal settling velocity, which of the following is true ?

(A) Buoyancy = weight + drag
(B) Weight = buoyancy + drag
(C) Drag = buoyancy + weight
(D) Drag = weight

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

______________ pumps are axial flow pumps?

(A) Turbine
(B) Propeller
(C) Diffuser
(D) None of these

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

Which of the following denotes the effect of compressibility in fluid flow ?

(A) Weber number
(B) Mach number
(C) Euler number
(D) Reynolds number

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

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’

Submitted By :Ali Uppal

The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _____________ fluid?

(A) Bingham
(B) Newtonian
(C) Perfect
(D) None of these

Submitted By :Ali Uppal

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