chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 26

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 Review each marked answer and report any item that may be outdated or unclear.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

501. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature) ?
0

A. 1/?T

B. 1/T

C. T

D. ?T

502. Pick out the wrong statement pertaining to fluid flow ?
0

A. The Newtonian fluid velocity in a circular pipe flow is maximum at the centre of the pipe

B. circular pipes is 0.5</strong>

C. The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid

D. Navier-Stokes equation is applicable to the analysis of viscous flows

E. Hagen-Poiseuille equation is applicable to the laminar flow of Newtonian fluids

503. Flow measurement in an open channel is done by a/an ________________?
0

A. Venturimeter

B. Rotameter

C. Weir

D. Orificemeter

504. With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the____________________?
0

A. Velocity increases

B. Pressure decreases

C. Both A. & B.

D. Neither A. nor B.

505. Cavitation in a centrifugal pump can be avoided by keeping the__________________?
0

A. Inlet pressure low

B. Outlet pressure low

C. Inlet pressure high

D. Outlet pressure high

506. The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct) ?
0

A. ?(x/2)

B. ?(2x)

C. ?(?x)

D. x

507. Boundary layer separation is caused by the_________________?
0

A. Reduction of pressure gradient to zero

B. Boundary layer thickness reducing to zero

C. Adverse pressure gradient

D. Reduction of pressure to vapour pressure

508. The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its__________________?
0

A. None of these

B. Specific volume

C. Viscosity

D. Velocity

509. Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid________________?
0

A. Is independent of the specific weight of the fluid

B. Is different for different fluids

C. Lies above the centroid of the plane surface

D. Is at the centroid of the plane surface

510. Nominal size of the discharge pipe of a pump is usually _____________ the nominal size of the inlet pipe?
0

A. Twice

B. Larger than

C. Smaller than

D. Same as

511. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the_________________?
0

A. Discharge

B. Discharge minus vapor pressure of the liquid at the discharge temperature

C. Suction

D. Suction minus vapor pressure of the liquid at suction temperature

512. 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________________?
0

A. 16800 Pa/m

B. 18900 Pa/m

C. 8400 Pa/m

D. 12600 Pa/m

513. In the laminar boundary layer flow over a flat plate, the ratio (?/x) varies as: (where, ? is the boundary layer thickness and x is the distance from the leading edge in the direction of flow)?
0

A. 1/Re

B. Re

C. Re-1/2

D. ?Re

514. Cocks are used to control ___________________?
0

A. Solids

B. None of these

C. Water

D. Any liquid

515. Volute type of casing is provided in a centrifugal pump to___________________?
0

A. Increase the discharge

B. Reduce the discharge fluctuation

C. Convert pressure head to velocity head

D. Convert velocity head to pressure head

516. Vena-contracta pressure tapping is at a distance _______________ from the position of an orificemeter fitted in a pipe of internal diameter d ?
0

A. 0.5 d

B. 2d

C. d

D. 4d

517. The ratio of wall drag to total drag in the Stokes law range is_________________?
0

A. 0.5

B. 1

C. 3-Jan

D. 2/3

518. A special type of liquid transporting device is the diffuser pump, in which _____________ are minimised?
0

A. Disk friction

B. Cavitation

C. Shock losses

D. Bearing losses

519. Gradually varied flow in open channel is a/an ____________ flow?
0

A. Steady uniform

B. Unsteady non-uniform

C. Unsteady uniform

D. Steady non-uniform

520. One horsepower is equal to________________?
0

A. 550 lbf.ft/second

B. 550 kgf.m/second

C. Both A. and B.

D. 550 lbf.ft./hr

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