chemical engineering MCQs – Page 335

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 Review each marked answer and report any item that may be outdated or unclear.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
6681. Cocks are used to control ___________________?
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A. Water

B. None of these

C. Solids

D. Any liquid
6682. Which of the following pipe bends will incur the largest head loss ?
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A. U-bend

B. 45 bend

C. 90 bend

D. 30 bend

6683. A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) ?
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A. 1

B. 10

C. 0.01

D. 0.1
6684. A pressure head of 320 metres of water in meters of CCl4 (sp.gr = 1.6) will be__________________?
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A. 200

B. 160

C. 100

D. 320

6685. A centrifugal pump loses prime after starting. The reason of this trouble may be_____________________?
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A. Too high a suction lift

B. All A., B., and C.

C. Low available NPSH and air leaks in the suction pipe

D. Incomplete priming

6686. Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of_________________?
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A. All A, B & C

B. Low melting point semi-solids

C. Liquids

D. Powder & granular solids

6687. The continuity equation in ideal fluid flow states that__________________?
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A. Energy is constant along a streamline

B. Energy is not constant along a streamline

C. Net rate of inflow into any small volume must be zero

D. There exists a velocity potential

6688. 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. 1.25

B. 1.84

C. 0.84

D. 0.5

6689. Two dimensional stream function________________?
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A. Relates velocity and pressure

B. Is constant along a stream line

C. None of these

D. Is constant along an equipotential surface

6690. For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter) ?
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A. Vs/Dp2

B. Vs2/Dp3

C. Vs2/Dp2

D. Vs/Dp3

6691. One horsepower is equal to________________?
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A. 550 lbf.ft/second

B. 550 kgf.m/second

C. Both A. and B.

D. 550 lbf.ft./hr

6692. The pipe wall thickness is minimum for a pipe of given nominal size having schedule number___________________?
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A. 80

B. 40

C. 160

D. 120

6693. Isotropic turbulence occurs __________________?
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A. Where there is no velocity gradient

B. At higher temperatures

C. None of these

D. Only in Newtonian fluids

6694. The fluid property which matters for falling rain drops to acquire spherical shape is its__________________?
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A. Height of descend

B. Viscosity

C. Surface tension

D. Pressure

6695. 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
6696. Net positive suction head (NPSH) of a centrifugal pump must be____________________?
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A. Greater than the vapour pressure of the liquid

B. Less than barometric pressure

C. Equal to the vapour pressure of the liquid

D. Less than the vapour pressure of the liquid

6697. Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively_______________?
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A. Efficiency, B.H.P. and head

B. Efficiency, head and B.H.P.

C. Head, efficiency and B.H.P.

D. B.H.P., efficiency and head

6698. The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is__________________?
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A. Parabolic

B. Flat

C. Parabolic near the wall and flat in the middle

D. Flat near the wall and parabolic in the middle

6699. Interstage coolers are provided in a multistage compressor to____________________?
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A. Save power in compressing a given volume to a given pressure

B. Achieve the exact delivery pressure

C. None of these

D. Cool the delivered air

6700. Each term of the Bernoullis equation written in the form, (p/?) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit ________________?
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A. None of these

B. Specific weight

C. Mass

D. Volume