chemical engineering MCQs – Page 324

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 Review each marked answer and report any item that may be outdated or unclear.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

6461. The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the _____________ length?
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A. Prandtl mixing

B. Equivalent

C. None of these

D. Transition

6462. Diaphragm valves are used for handling _______________ fluids?
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A. Non-Newtonian

B. Viscous

C. Corrosive

D. Solid suspended

6463. Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the _________________?
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A. Temperature

B. Pressure

C. Both A. & B.

D. Neither A. nor B.

6464. The equivalent diameter for flow through a rectangular duct of width B and height H is___________________?
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A. 2HB/(H + B)

B. HB/2 (H + B)

C. HB/(H + B)

D. 4HB/(H + B)

6465. The ratio of maximum to average velocity in case of streamline flow between parallel plates is______________________?
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A. 2

B. 1.5

C. 1

D. 2.5

6466. In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure ______________ the vapor pressure of the liquid at the suction temperature?
0

A. Higher than

B. Lower than

C. None of these

D. Equal to

6467. With increase in temperature, the vapor pressure of liquids__________________?
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A. Decreases

B. Increases

C. Remain constant

D. Increases linearly

6468. Power required for mixing Newtonian fluids is a function of the _________________?
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A. Density of fluid, viscosity of fluid & impeller dia only

B. Density & viscosity of fluid only

C. Speed of impeller, diameter of impeller & viscosity

D. None of these

6469. The ratio of actual discharge to theoretical discharge through an orifice is equal to______________?
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A. Cc . Cv

B. Cc . Cd

C. Cv . Cd

D. Cd/Cv

6470. Quicksand is an example of a __________ fluid?
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A. Pseudo plastic

B. Dilatant

C. Newtonian

D. Bingham plastic

6471. Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the_______________?
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A. Bed height

B. Drag on column walls

C. Drag on particles

D. Bed voidage

6472. Potential function is applicable only for __________ flow?
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A. Turbulent

B. Steady

C. Irrotational

D. None of these

6473. Rise of liquid in a capillary tube is due to_________________?
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A. Cohesion

B. Adhesion

C. Both A. & B.

D. Neither A. nor B.

6474. The curve of metacentre for a floating body ____________ the curve of buoyancy?
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A. Is always below

B. Is the evolute of

C. Is tangential to

D. Intersects at right angle

6475. Maximum theoretical suction lift for water at 15C by a centrifugal pump is 34 ft. The same for water at 90C will be _____________________ ft?
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A. 37

B. 8

C. 40

D. 34

6476. Which of the following has the maximum compression ratio ?
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A. Blower

B. Fan

C. Vacuum pump

D. Compressor

6477. Which law is followed by the velocity distribution in the turbulent boundary layer ?
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A. Logarithmic law

B. Linear law

C. Parabolic law

D. None of these

6478. Erosion and pits formation on the impeller of a centrifugal pump may be due to________________?
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A. Off centering of pump with motor

B. Cavitation

C. Its operation with delivery valve closed for considerable time after starting the pump

D. Low speed of impeller

6479. Check valve is used for ________________ flow?
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A. Unidirectional

B. Very precise control of

C. Multidirectional

D. None of these

6480. The vent valve provided in a liquid handling centrifugal pump is___________________?
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A. All A., B. and C.

B. Helpful in easy removal of samples

C. Used to release any gases that might be vapour locking the pump

D. Generally a needle valve

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