Chemical Engineering Mcqs

Transition from laminar flow to turbulent flow is aided by the__________________?

(A) Surface roughness and curvature (i.e. sharp corners)
(B) Vibration
(C) Pressure gradient and the compressibility of the flowing medium
(D) All

Submitted By :Ali Uppal

At low Reynolds number______________?

(A) Viscous forces are unimportant
(B) Viscous forces control
(C) Viscous forces control and inertial forces are unimportant
(D) Gravity forces control

Submitted By :Ali Uppal

Which of the following valves will incur maximum pressure drop for the same discharge of water ?

(A) Globe valve
(B) Gate valve
(C) Needle valve
(D) Butterfly valve

Submitted By :Ali Uppal

Venturimeter and orificemeter measures the _____________ of the fluid?

(A) Pressure
(B) Maximum velocity
(C) Average velocity
(D) Point velocity

Submitted By :Ali Uppal

A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an _____________ fluid?

(A) Newtonian
(B) Non-Newtonian
(C) Ideal
(D) Incompressible

Submitted By :Ali Uppal

A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any „x‟? Assume incompressible one dimensional flow i.e., no gradients in the radial direction ?

(A) VX = V0 + q (x3/L2D)
(B) VX = V0 + ⅓q (x3/L2)
(C) VX = V0 + 2q (x2/LD)
(D) VX = V0 + (4/3) q (x3/L2D)

Submitted By :Ali Uppal

Navier-Stokes equation is useful in the analysis of _____________ fluid flow problems?

(A) Non-viscous
(B) Viscous
(C) Turbulent
(D) Rotational

Submitted By :Ali Uppal

The head loss in turbulent flow in a pipe varies_________________?

(A) Directly as the velocity
(B) Inversely as the square of the velocity
(C) Approximately as the square of the velocity
(D) Inversely as the square of the diameter

Submitted By :Ali Uppal

Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)?

(A) H
(B) 12.6 H
(C) 13.6 H
(D) 14.6 H

Submitted By :Ali Uppal

Which of the following produces maximum pressure difference for transportation of gases ?

(A) Vacuum pumps
(B) Blowers
(C) Fans
(D) Compressors

Submitted By :Ali Uppal

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