chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 23

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 Review each marked answer and report any item that may be outdated or unclear.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
441. The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is__________________?
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A. Flat near the wall and parabolic in the middle

B. Flat

C. Parabolic

D. Parabolic near the wall and flat in the middle
442. Which of the following is the Blasius equation?, relating friction factor to the Reynolds number ?
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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

443. The capacity of an accumulator is the maximum_________________?
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A. Energy which it can store

B. Liquid which it can store

C. Discharge which it can deliver

D. None of these

444. 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. None of these

C. Acid egg

D. Blower

445. Which of the following is a dimensionless parameter ?
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A. None of these

B. Kinematic viscosity

C. Angular velocity

D. Specific weight

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

B. Gear

C. Multistage centrifugal

D. Reciprocating

447. Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds___________________?
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A. 2100

B. 3000

C. 1500

D. 4000

448. The ratio of the wall drag to the form drag in the Stokes law range (for motion of spherical particles in a stationary fluid) is__________________?
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A. 0.33

B. 2

C. 0.5

D. 1

449. Speed of sound in an ideal gas depends on its________________?
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A. Temperature

B. None of these

C. Specific volume

D. Pressure

450. A Bingham fluid of viscosity ? = 10 Pa.s and yield stress, ?0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is________________?
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A. 10 KPa

B. 20 KPa

C. 30 KPa

D. 40 KPa

451. Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively) ?
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A. FL-2T, ML-1T-1

B. FLT, ML-1T-1

C. F-1L2T-1, MLT-3

D. ML-1T-3, F-1L2T

452. Power loss in an orificemeter is _____________ that in a Venturimeter?
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A. Data insufficient, cannot be predicted

B. Less than

C. Same as

D. More than
453. In case of laminar flow of fluid through a circular pipe, the__________________?
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A. Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the

B. Shear stress over the cross-section is proportional to the distance from the surface of the pipe

C. ume of circumscribing cylinder</strong>

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

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

454. The resistance wire used in a hot wire anemometer for conducting electrical current is made of__________________?
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A. Chromium

B. Aluminium

C. Tungsten

D. Copper

455. A pressure head of 320 metres of water in meters of CCl4 (sp.gr = 1.6) will be__________________?
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A. 100

B. 200

C. 320

D. 160

456. A fluid (?/?) = 0.01 cm2/sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is _______________ cm/sec?
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A. 700

B. 7

C. 630

D. 7000

457. In case of a Rotameter, the density of the float material is _____________ that of the liquid it replaces?
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A. Equal to

B. More than

C. Less than

D. Either A. or B.

458. For ideally incompressible fluid, the Mach number will be __________________?
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A. 1.5

B. 1

C. 5

D. 0

459. If in a flow field, between any two points, then the flow must be___________________?
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A. Steady, compressible, irrotational

B. Unsteady, incompressible, irrotational

C. Steady, incompressible, irrotational

D. Steady, compressible and along a streamline

460. For pipes that must be broken at intervals for maintenance, the connector used should be a/an__________________?
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A. Union

B. Tee

C. Reducer

D. Elbow