Fluid Mechanics for Chemical MCQs

724 MCQs — Chemical Engineering MCQs (Page 55 of 73)

Attempt Fluid Mechanics for Chemical Quiz

Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid________________?

A. Lies above the centroid of the plane surface
B. Is independent of the specific weight of the fluid
C. Is different for different fluids
D. Is at the centroid of the plane surface

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Vena-contracta pressure tapping is at a distance _______________ from the position of an orificemeter fitted in a pipe of internal diameter ‘d’ ?

A. D
B. 0.5 d
C. 2d
D. 4d

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A special type of liquid transporting device is the diffuser pump, in which _____________ are minimised?

A. Bearing losses
B. Disk friction
C. Shock losses
D. Cavitation

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For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by _________________?

A. √(2gh)
B. C.v. √(2gh)
C. Cd √(2gh)
D. Cc √(2gh)

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Specific speed of a centrifugal pump relates it with another pump having the___________________?

A. Dynamic similarity
B. Same efficiency
C. Same speed
D. Geometrical similarity

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Isotropic turbulence occurs __________________?

A. Where there is no velocity gradient
B. At higher temperatures
C. Only in newtonian fluids
D. None of these

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A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation ?

A. Inertial and drag forces are important
B. Drag, gravitational and buoyancy forces are important
C. Drag force and gravitational forces are important
D. None of the above

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Which of the following is the „Blasius equation‟, relating friction factor to the Reynolds number ?

A. F = 0.079.nre-0.25
B. F-0.5 = 4.07 loge (nref)-0.6
C. Both ‘a’ and ‘b’
D. None of these

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In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ?

A. Rotational
B. Unsteady
C. Turbulent
D. Non-uniform

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Draining of shallow pits or sump is done by a sump pump, which is a ______________ pump?

A. Single stage vertical
B. Centrifugal
C. Plunger
D. Diffuser

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