Fluid Mechanics for Chemical MCQs

724 MCQs — Chemical Engineering MCQs (Page 32 of 73)

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A fluid element has a velocity V = -y2. xi + 2yx2 . j. The motion at (x, y) = (1/√2, 1) is_________________?

A. Rotational and incompressible
B. Rotational and compressible
C. Irrotational and compressible
D. Irrotational and incompressible

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A stream tube is that, which has ______________________ cross-section entirely bounded by stream lines?

A. A circular
B. Any convenient
C. A small
D. A large

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Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________?

A. Q/2
B. Q/4
C. Q/8
D. Q/16

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The head developed by a centrifugal pump is largely determined by the____________________?

A. Power of the pump
B. Nature of the liquid being pumped
C. Angle of the vanes and the speed of the tip of the impeller
D. Vapour pressure of the liquid

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Priming is needed in a ______________ pump?

A. Reciprocating
B. Gear
C. Centrifugal
D. Diaphragm

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The Mach number for hypersonic flow of compressible fluid is____________________?

A. 1
B. > 1
C. > 4
D. < 2

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Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type?

A. Axial
B. Radial
C. Mixed
D. None of these

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Which of the following properties of a fluid is responsible for offering resistance to shear ?

A. Surface tension
B. Viscosity
C. Specific gravity
D. All a., b., and c.

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Power required for mixing Newtonian fluids is a function of the _________________?

A. Speed of impeller, diameter of impeller & viscosity
B. Density & viscosity of fluid only
C. Density of fluid, viscosity of fluid & impeller dia only
D. None of these

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A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _______________ cms?

A. 17
B. 42
C. 84
D. 1.8

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