Chemical Engineering MCQs

Page No. 240

Plunger pumps are used for__________________?


aHigher pressure


bSlurries


cViscous mass


dNone of these


View Answer Higher pressure

A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is _____________ litres?


a600


b660


c1.1


d60


View Answer 660

The blades of a centrifugal impeller are said to be curved forward, if the ____________ of the motion of impeller blades?


aInlet tip of a blade curves in a direction opposite to that


bOutlet tip of a blade curves in a direction opposite to that


cInlet tip of a blade is towards the direction


dOutlet tip of a blade is towards the direction



If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is_________________?


aSame in both the tubes


bGreater in 1 mm dia tube


cGreater in 0.5 mm dia tube


dZero in both the tubes



Stoke’s law is valid, when the particle Reynolds number is ______________________?


a< 1


b> 1


c< 5


dNone of these


View Answer < 1

Transition length for turbulent flow in smooth pipe is equal to _____________ times the pipe diameter?


a0.5


b5


c50


d500


View Answer 50

Velocity head on sudden enlargement in a horizontal pipe is converted into ______________ head?


aElevation


bPressure


cBoth A. & B.


dNeither A. nor B.


View Answer Pressure

Choose the set of pressure intensities that are equivalent ?


a4.33 psi, 10 ft. of water, 8.83 inches of Hg


b4.33 psi, 10 ft. of water, 20.7 inches of Hg


c10 psi, 19.7 ft. of water, 23.3 inches of Hg


d10 psi, 19.7 ft. of water, 5.3 inches of Hg



Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement ?


af1 = f2


bf1 < f2


cf1 > f2


dData not sufficient to relate f1 & f2


View Answer f1 > f2

Critical velocity in a pipe flow_________________?


aIncreases as fluid viscosity increases


bIncreases as pipe diameter increases


cIndependent of fluid density


dNone of these



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