chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 34

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fluid mechanics for chemical chemical engineering Mcqs

661. Power requirement of fans having constant wheel diameter varies _____________ fan speed?
0

A. None of these

B. As cube of

C. As square of

D. Directly as

662. Select the wrong statement pertaining to flow of an incompressible fluid through a Venturimeter ?
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A. Discharge of fluid through a Venturimeter depends upon the gage difference irrespective of

B. For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that

C. Venturimeter incurs less power loss compared to an equivalent orificemeter

D. ving the Venturimeter

E. Venturimeter occupies less space than an orificemeter

F. orientation of Venturimeter

663. The dimension of surface tension is________________?
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A. MT-2

B. ML-2T

C. MLT-2

D. ML-2

664. Pick out the correct statement pertaining to Venturimeter ?
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A. None of these

B. nward, than when the flow is vertically upward

C. The co-efficient of contraction of a Venturimeter is always unity

D. A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically

E. For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when

F. pressibility is taken into account, than when it is neglected

665. The head loss in turbulent flow in a pipe varies_________________?
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A. Approximately as the square of the velocity

B. Directly as the velocity

C. Inversely as the square of the diameter

D. Inversely as the square of the velocity

666. For the production of very high vacuum, a _____________ pump is normally used?
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A. Centrifugal

B. Piston

C. Jet ejector

D. Diffusion

667. Select the correct statement?
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A. pressibility is taken into account, than when it is neglected

B. A Venturimeter with a given gage difference discharges at a greater rate, when the flow is

C. tically downward through it, than when the flow is vertically upward

D. entation of the meter</strong>

E. h the same throat dia is used

F. For a given pressure difference, the discharge of gas is greater through a Venturimeter, when

668. Pick out the wrong statement?
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A. With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids

B. In the equation, T. gc = k. (du/dy)n the value of n for pseudoplastic and Dilatant fluid are 1 respectively

C. The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). ?p

D. Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion

669. Each term in Bernoulli?s equation represents the _____________ of the fluid?
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A. None of these

B. Energy per unit weight

C. Force per unit mass

D. Energy per unit mass

670. The simple Pitot tube does not measure the________________?
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A. All A., B. and C.

B. Static pressure

C. Velocity at the stagnation point

D. Dynamic pressure

671. With a constant diameter impeller of a centrifugal pump _____________________?
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A. Its capacity varies directly as the square of speed

B. Horsepower input varies as the square of speed

C. Head varies as the speed

D. Head varies as the square of speed

672. Transition from laminar flow to turbulent flow is aided by the__________________?
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A. Surface roughness and curvature (i.e. sharp corners)

B. Vibration

C. All A., B. & C.

D. Pressure gradient and the compressibility of the flowing medium

673. The equivalent diameter for fluid flow through square cross section channel of side x, for pressure drop calculation purpose is given by____________________?
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A. x

B. ?x

C. 4x

D. 2x

674. For a reciprocating pump, the indicator diagram is the graph between the________________?
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A. Volume swept by piston for one complete revolution and the pressure in the cylinder

B. Discharge and overall efficiency

C. Angle swept by the crank pin at any instant and the discharge

D. None of these

675. Permanent pressure loss in a well designed Venturimeter is about _____________ percent of the venturi differential?
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A. 10

B. 1

C. 50

D. 30

676. High specific speed of a pump implies that, it is a/an _____________ pump?
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A. Centrifugal

B. None of these

C. Mixed flow

D. Axial flow

677. In Newtons law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the ______________ of its diameter?
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A. First power

B. Square root

C. Inverse

D. Second power

678. Which of the following valves will incur maximum pressure drop for the same discharge of water ?
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A. Gate valve

B. Butterfly valve

C. Needle valve

D. Globe valve

679. Sewage sludge is an example of the ______________ fluid?
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A. Bingham plastic

B. Pseudo plastic

C. Dilatent

D. Newtonian

680. The unit of bulk modulus of elasticity for a liquid in S.I. unit is____________________?
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A. N/m

B. N/m2

C. N/m3

D. N

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