chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 29

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 Review each marked answer and report any item that may be outdated or unclear.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
561. With increase in the temperature, viscosity of a liquid____________________?
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A. Increases

B. Decreases

C. May increase or decrease; depends on the liquid

D. Remain constant

562. Absolute viscosity of a fluid is a function of the __________ of the fluid?
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A. Motion

B. Pressure & temperature

C. Shearing stress

D. Both B. & C.
563. The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is_________________?
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A. 0.03

B. 0.3

C. 0.9

D. 0.66

564. The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonian fluid in a circular pipe is_____________________?
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A. 1

B. 0.5

C. 0.66

D. 2

565. Nature of fluid flow during the opening of a valve in a pipeline is_________________?
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A. Uniform

B. Unsteady

C. Laminar

D. Steady</strong>

566. Cd for the orifice plate varies from ___________________?
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A. 0.58 to 0.8

B. 0.2 to 0.3

C. 0.02 to 0.03

D. 0.93 to 0.98

567. Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have_____________?
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A. Higher capital &maintenance cost

B. Very low speeds

C. Smaller discharge

D. High vibrations

568. The rate of change of moment of momentum represents the ______________ by the fluid?
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A. Power developed

B. Torque applied

C. Work done

D. Force exerted

569. In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the _____________ efficiency?
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A. Mechanical

B. Manometric

C. Overall

D. Volumetric

570. Mercury is an ideal barometric fluid mainly due to its __________________?
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A. Very low vapor pressure

B. High density

C. Low compressibility

D. Low capillary action

571. The normal stress is the same in all directions at a point in a fluid, when the fluid is__________________?
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A. Non-viscous

B. Incompressible

C. Both A. and B.

D. Having no motion of one fluid layer relative to the other
572. Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ?
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A. Length & discharge

B. Length & diameter

C. Friction factor & diameter

D. Head & discharge
573. If the head over the triangular notch is doubled, the discharge will increase by ______________ times?
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A. 4

B. 2.828

C. 2

D. 5.657
574. In turbulent flow, a rough pipe has the same friction factor as a smooth pipe____________________?
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A. In the zone of complete turbulence

B. When the friction factor is independent of the Reynolds number

C. Everywhere in the transition zone

D. When the roughness projections are much smaller than the thickness of the laminar film
575. A pipe is defined as hydraulically smooth, if the friction factor_________________?
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A. Is not a function of Reynolds number

B. None of these

C. Is zero irrespective of the Reynolds number

D. For a given Reynolds number remains constant even on further smoothening of the pipe
576. An ideal nozzle design aims at________________?
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A. Minimising wall friction

B. Suppressing boundary layer separation

C. Both A. & B.

D. Neither A. nor B.

577. In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is_________________?
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A. 0.5

B. 0.84

C. 1.84

D. 1.25

578. Schedule number of a pipe, which is a measure of its wall thickness, is given by ________________?
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A. 1000 P/S

B. 1000 S/P

C. 100 P/S

D. 10000 P/S

579. The line of action of the buoyant force passes through the centre of gravity of the_______________________?
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A. Displaced volume of the fluid

B. Horizontal projection of the body

C. Volume of fluid vertically above the body

D. Submerged body

580. For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary_______________?
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A. Directly as square root of gas density

B. Directly as square of gas density

C. Inversely as gas density

D. Directly as gas density