chemical engineering MCQs – Page 334

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
6661. The Prandtl Pitot tube measures the__________________?
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A. Pressure difference in pipe flow

B. Pressure at a point

C. Average flow velocity

D. Velocity at a point in the flow
6662. Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.) ?
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A. d2/3

B. d4/5

C. ?d

D. d1/3

6663. Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have_____________?
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A. High vibrations

B. Higher capital &maintenance cost

C. Very low speeds

D. Smaller discharge

6664. Specific speed of a centrifugal pump relates it with another pump having the___________________?
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A. Same speed

B. Geometrical similarity

C. Dynamic similarity

D. Same efficiency

6665. Draining of shallow pits or sump is done by a sump pump, which is a ______________ pump?
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A. Centrifugal

B. Single stage vertical

C. Diffuser

D. Plunger

6666. Small pressure differences in liquids is measured using a/an__________________?
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A. None of these

B. Pitot tube

C. U-tube manometer

D. Inclined tube manometer
6667. While starting a centrifugal pump, its delivery valve should be kept___________________?
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A. Closed

B. Opened

C. Either opened or closed; depending on the fluid viscosity

D. Either opened or closed; it does not make any difference

6668. What is the normal range of exit cone angle of a Venturimeter ?
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A. >25

B. 15 to 25

C. 7 to 15

D. 2 to 5

6669. The Stokes stream function applies to the________________?
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A. None of these

B. Ideal/non i viscous fluids only

C. Irrotational flow only

D. Cases of axial symmetry
6670. For the manometer set up shown in the figure, the pressure difference PA PB is given by_________________?
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A. (?H ?L) gL + (?L ?air)gH

B. (?H ?air)gH

C. (?H ?L)gH

D. (?H ?L) gH + (?L ?air) . g(L H)

6671. For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter) ?
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A. D2

B. 1/D5

C. 1/D

D. 1/D2

6672. The pressure drop per unit length of pipe incurred by a fluid X flowing through pipe is ?p. If another fluid Y having both the specific gravity & density just double of that of fluid X, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be__________________?
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A. ?p2

B. ?p/2

C. ?p

D. 2?p
6673. Friction produced by the formation of wakes is called the ______________ friction?
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A. None of these

B. Skin

C. Form

D. Disk

6674. For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by_______________?
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A. ?u/?x = 0

B. ?(?u)/?x = 0

C. ??/?t = 0

D. (?u/?x) = (??/?t)

6675. Baffles in mixing tanks are provided to__________________?
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A. Aid in rotational flow

B. None of these

C. Increase the structural strength of the tank

D. Reduce swirling and vortex formation
6676. Stokes law is valid, when NRe, p is less than_________________?
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A. 100

B. 700

C. 2

D. 2100

6677. For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be __________________?
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A. V2 > V1 and V2 > V3

B. V1 < V2 < V3

C. None of these

D. V1 > V2 > V3

6678. A fluid whose apparent viscosity increases with shear rate is termed as the _____________ fluid?
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A. Newtonian

B. Dilatant

C. Viscous

D. Non-viscous

6679. The head loss due to sudden expansion is__________________?
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A. (V12 V22)/gc

B. (V12 V22)/2gc

C. (V1 V2)2/2gc

D. (V1 V2)/2gc

6680. Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the___________________?
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A. Fluid velocity in the pipe

B. Time taken to close the valve

C. Pipe length

D. All A., B. and C.