chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 33

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 Review each marked answer and report any item that may be outdated or unclear.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

641. For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter) ?
0

A. 1/D

B. 1/D2

C. 1/D5

D. D2

642. Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an ________________?
0

A. Venturimeter

B. Pitot tube

C. Rotameter

D. Orificemeter

643. For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to____________________?
0

A. R0.5

B. R2

C. R4

D. R

644. Pick out the wrong statement?
0

A. The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance

B. The form drag is dependent upon the occurrence of a wake

C. An ideal fluid is the one, which has negligible surface tension and obeys the Newtons law of viscosity

D. Existence of the boundary layer in fluid flow is because of viscosity of the fluid.

645. Efficiency of power transmission (?) through a circular pipe is given by (ht hf)/ht, which has a maximum value of _____________ percent?
0

A. 66.6

B. 88.8

C. 33:03:00

D. 50

646. The friction factor is___________________?
0

A. None of these

B. Not dependent on the roughness of the pipe

C. Not dimensionless

D. Always inversely proportional to the Reynolds number

647. Location of vena-contracta in an orificemeter does not depend upon the________________?
0

A. Ratio of pipe diameter to orifice diameter

B. Density, viscosity & compressibility of the fluid

C. Type of orifice

D. Pipe roughness

648. The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is__________________?
0

A. 2

B. > 1

C. < 1

D. 1

649. Specific speed of a centrifugal pump depends upon the ______________ head?
0

A. Delivery

B. None of these

C. Manometric

D. Suction

650. For an ideal fluid flow, Reynolds number is___________________?
0

A. 2100

B. ?

C. 100

D. 0

651. Pick out the wrong statement about cavitation?
0

A. Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines

B. Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine

C. des</strong>

D. Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in

E. ulting in audible noise

F. mation & collapse of vapor cavities

652. Maintenance cost of a ______________ pump for a particular duty is the least?
0

A. Centrifugal

B. Gear

C. Volute

D. Reciprocating

653. A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is_________________?
0

A. 11.77 kPa

B. 21.13 kPa

C. 25.61 kPa

D. 14.86 kPa

654. The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?
0

A. HW/2 (H + W)2

B. ?(HW/?)

C. 2HW/(H + W)

D. HW/4 (H + W)2

655. Pick out the correct statement?
0

A. ess and shear gradient

B. For a non-Newtonian fluid, a straight line passes through the origin in a plot between shear

C. Thin lubricating oil is an example of a non-Newtonian fluid

D. Human blood is a Newtonian fluid

E. A Newtonian fluid obeys Newtons law of cooling

656. Navier-Stokes equation is useful in the analysis of _____________ fluid flow problems?
0

A. Rotational

B. Viscous

C. Turbulent

D. Non-viscous

657. Pick out the wrong statement ?
0

A. In a static mass of liquid, the pressure at a point is the same for all liquids

B. Pressure decreases exponentially with elevation in an isothermal atmosphere

C. As per Pascals law, the pressure at a point in a static or uniformly moving fluid is equal in all

D. Atmospheric pressure = absolute pressure ? gage pressure

E. ections

658. Pick out the wrong statement?
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A. The pressure of the liquid measured by a piezometer tube is the gauge pressure

B. Manometric liquid should have high surface tension

C. The vacuum pressure is always the negative gauge pressure

D. The point at which the resultant pressure on an immersed surface acts, is known as the centre

E. gravity</strong>

659. The friction factor for turbulent flow in a hydraulically smooth pipe______________?
0

A. Depends on the roughness

B. Does not depend on Reynolds number

C. None of these

D. Depends only on Reynolds number

660. Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)?
0

A. 13.6 H

B. H

C. 14.6 H

D. 12.6 H

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