chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.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

21. Choose the set of pressure intensities that are equivalent ?
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A. 10 psi, 19.7 ft. of water, 5.3 inches of Hg

B. 10 psi, 19.7 ft. of water, 23.3 inches of Hg

C. 4.33 psi, 10 ft. of water, 20.7 inches of Hg

D. 4.33 psi, 10 ft. of water, 8.83 inches of Hg

22. Which of the following can be used to create a flow of gas, where no significant compression is required ?
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A. Reciprocating compressor

B. Blower

C. Centrifugal compressor

D. Axial flow compressor

23. Which is the most efficient and best for measuring very small flow rate of gases ?
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A. Orificemeter

B. Rotameter

C. Venturimeter

D. Flow nozzle

24. In laminar flow through a round tube, the discharge varies ______________________?
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A. As the square of the radius

B. Linearly as the viscosity

C. Inversely as the viscosity

D. Inversely as the pressure drop

25. When the water is warm, the height to which it can be lifted by a pump_________________?
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A. Increases due to increased vapour pressure

B. Decreases due to reduced viscosity

C. Decreases due to increased frictional resistance

D. Decreases due to reduced vapour pressure

26. The velocity for subsonic flow in a pipeline_______________?
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A. Decreases in the downstream direction

B. Increases in the downstream direction

C. Is independent of the area of flow

D. Is constant

27. The head loss due to sudden contraction is proportional to___________________?
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A. Velocity head

B. Velocity

C. None of these

D. Turbulence

28. Which of the following facilitates close control of flow of fluids ?
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A. Gate valve

B. Check valve

C. Globe valve

D. Butterfly valve

29. Pick out the correct statement pertaining to transition/ entrance length in fluid flow ?
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A. al to 50 D

B. All A., B. and C.

C. 5. D.NRe

D. The length of entrance region of pipe, in which full development of fluid flow takes place

E. h that velocity profile does not change downstream, is called the transition length

F. Transition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter d is

30. The boundary layer is that part of a moving fluid, in which the fluid velocity is_________________?
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A. Constant

B. Affected by the presence of a solid boundary

C. All A., B. and C.

D. Affected by the fluid flow pressure

31. The pressure co-efficient is the ratio of pressure forces to ______________ forces?
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A. Gravity

B. Surface tension

C. Viscous

D. Inertial

32. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?
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A. 10 m

B. 30 m

C. 11 m

D. 11.8 m

33. In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes_______________?
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A. More than liquid vapor pressure

B. More than atmospheric pressure

C. Less than atmospheric pressure

D. Less than liquid vapor pressure

34. In which of the following body shapes, the pressure drag is large compared to the friction drag ?
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A. Stream line body

B. None of these

C. Two dimensional body

D. Bluff body

35. In a dry packed bed, the pressure drop will be changed by increasing the flow rate as__________________?
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A. V

B. V-0.8

C. V-1

D. V1.8

36. Pascal law is not applicable for a/an ________________________ fluid?
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A. Uniformly moving

B. Static

C. None of these

D. Accelerating frictionless

37. Which of the following is a Newtonian fluid ?
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A. Sewage sludge

B. Rubber latex

C. Non-colloidal solution

D. Quicksand

38. Applicability of Bernoullis equation is limited to a/an _____________ fluid, that does not exchange shaft work with the surroundings?
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A. Incompressible

B. Non-viscous

C. Both A. and B.

D. Neither A. nor B.

39. The maximum delivery pressure of a reciprocating compressor may be about ______________ kg/cm2?
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A. 1000

B. 3000

C. 4000

D. 2000

40. Centrifugal pumps as compared to reciprocating pumps__________________?
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A. Run at a lower speed for the same discharge

B. Deliver fluid with pulsating/fluctuating discharge

C. Can be run with discharge line valve closed for a short interval

D. Do not need priming

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