chemical engineering MCQs – Page 331

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 Review each marked answer and report any item that may be outdated or unclear.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

6601. Eulers equation of motion is a statement expressing____________________?
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A. Conservation of mass

B. Conservation of energy

C. Newtons second law of motion

D. Newtons first law of motion

6602. A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is__________________?
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A. 5 m/sec

B. 10 m/sec

C. 20 m/sec

D. 5 ?2 m/sec

6603. In case of laminar flow of fluid through a circular pipe, the__________________?
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A. Shear stress over the cross-section is proportional to the distance from the surface of the pipe

B. Velocity profile varies hyperbolically and the shear stress remains constant over the crosssection

C. ume of circumscribing cylinder</strong>

D. Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)

E. Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the

6604. In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of___________________?
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A. Friction co-efficient for flows at equal Reynold number

B. Relative roughness

C. All A., B. & C.

D. Absolute roughness

6605. Open channel liquid flow is most conveniently measured by a__________________?
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A. Notch

B. Hot wire anemometer

C. Segmental orifice

D. Rotameter

6606. For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are__________________?
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A. h1 > h2 < h3

B. h2 < h1 < h3

C. h1 > h2 > h3

D. h1 < h2 < h3

6607. A gas (density = 1.5 kg/m3, viscosity = 2 10?5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m3and viscosity of 3 10?5kg/m.s flowing at 3 m/s will be________________?
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A. 18900 Pa/m

B. 16800 Pa/m

C. 8400 Pa/m

D. 12600 Pa/m

6608. Boiler feed water pump is usually a ______________ pump?
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A. Diaphragm

B. Gear

C. Reciprocating

D. Multistage centrifugal

6609. The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stokes law range is proportional to the_____________________?
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A. Square of particle size

B. Difference in the densities of the particle & fluid

C. Inverse of fluid viscosity

D. All A., B. and C.

6610. Re/NFr is called the _____________ number?
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A. Brinkman

B. Galileo

C. Archimedes

D. Euler

6611. If x is the depth of flow in an open channel of large width, then the hydraulic radius is equal to________________?
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A. x/2

B. 2x/3

C. x

D. x/3

6612. When the momentum of one fluid is used for moving another fluid, such a device is called a/an______________?
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A. Jet pump

B. Blower

C. Acid egg

D. None of these

6613. Hydraulic radius is the ratio of ____________________?
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A. Square root of flow area to wetted perimeter

B. Wetted perimeter to flow area

C. Flow area to square of wetted perimeter

D. Flow area to wetted perimeter

6614. Which of the fluid forces are not considered in the Reynolds equation of flow ?
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A. Viscous forces

B. Pressure forces

C. Turbulent forces

D. Compressibility forces

6615. What is the ratio of fluid carrying capacity of two pipes having diameters d1 and d2 respectively ?
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A. d1/d2

B. (d1/d2)0.5

C. (d1/d2)0.8

D. (d1/d2)2

6616. What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water interface? The balloon is of radius 0.1 m and is filled with air ?
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A. 0.01 ?gH/8

B. 4?g/3

C. 0.01 ?gH/4

D. 0.04 ?gH/3

6617. What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta ?
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A. 1.65

B. 0.94

C. 0.32

D. 0.64

6618. The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and___________________?
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A. Hot

B. Static

C. Moving

D. Cold

6619. Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an________________?
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A. Cup and vane anemometer

B. None of these

C. Weir

D. Hot wire anemometer

6620. The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its __________________?
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A. Absolute viscosity

B. Density

C. Ratio of absolute viscosity to density

D. Reynolds number

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