chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 3

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 Review each marked answer and report any item that may be outdated or unclear.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
41. Existence of boundary layer in fluid flow is because of the_________________?
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A. Fluid viscosity

B. Fluid density

C. Surface tension

D. Gravity forces

42. Air vessel fitted to a reciprocating pump____________________?
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A. Decreases the work done

B. Results in non-uniform discharge

C. Increases the work done

D. Causes cavitation

43. Identification of pipelines carrying different liquids and gases is done by the ____________ of the pipe?
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A. Altitude

B. Diameter

C. Colour

D. None of these

44. Drag force on the float of a Rotameter is (where Q = flow rate of the)__________________?
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A. Constant

B. ? ?Q

C. ? Q2

D. ? Q

45. Air vessel of a reciprocating pump is initially filled with___________________?
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A. Compressed air

B. None of these

C. Water

D. Atmospheric air

46. _____________ pump is the most suitable device for discharging a liquid against a pressure of ? 1500 kgf/cm2?
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A. Vane

B. Piston

C. Plunger

D. Centrifugal

47. For turbulent flow of Newtonian fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is ________________?
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A. 0.66

B. 0.5

C. 1

D. < 0.5

48. Which law/principle of solid mechanics is similar/equivalent to Newtons law of viscosity in fluid mechanics ?
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A. Archimedes principle

B. Hookes law

C. Newtons second law of motion

D. Newtons third law of motion

49. Self-priming centrifugal pump can be used for________________?
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A. All A., B. and C.

B. Pumping industrial wastes

C. Pumping liquid fertilisers (e.g. liquid NH3)

D. Booster service

50. Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement ?
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A. f1 = f2

B. f1 > f2

C. Data not sufficient to relate f1 & f2

D. f1 < f2

51. The ratio of pressure forces to inertial forces is called the _______________ number?
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A. Euler

B. Froude

C. Mach

D. Reynold

52. Pressure drop in packed bed for turbulent flow is given by the ______________ equation?
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A. Levas

B. Blake-Plummer

C. Kozeny-Carman

D. Hagen-Poiseuilles

53. Function of air vessel provided in a reciprocating pump is to_________________?
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A. Reduce discharge fluctuation

B. Avoid the necessity of priming

C. Increase the pump efficiency

D. Reduce the danger of cavitation

54. Purpose of air lift pump is to____________________?
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A. Lift compressed air

B. Lift water from a well by using compressed air

C. Compress air

D. Lift air under negative pressure

55. What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter D & length L incurring a pressure drop ?p with average velocity Vavg ?
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A. D ?p/8L

B. 8 Vavg/D

C. D ?p/4L

D. 4 Vavg/D

56. Equivalent length of a pipe fitting is____________________?
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A. None of these

B. Dependent on Reynolds number

C. Independent of Reynolds number

D. Dependent on the length of the pipe

57. A hydraulic accumulator comprises of__________________?
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A. A cylinder and a plunger

B. A storage device and a control valve

C. Two pistons and two cylinders

D. A storage tank and a ram pump

58. In magnetic flow meters, voltage generation is________________?
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A. Due to the motion of conducting fluid through an externally generated uniform field

B. Proportional to the fluid velocity

C. Both A. and B.

D. Neither A. nor B.

59. Select the correct practical example of steady non-uniform flow?
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A. Steadily decreasing flow through a reducing section

B. Steadily increasing flow through a pipe

C. Motion of river around bridge piers

D. Motion of water around a ship in a lake

60. Foot valves are provided in the suction line of a centrifugal pump to ____________________?
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A. Minimise the fluctuation in discharge

B. Avoid priming, every time we start the pump

C. Remove the contaminant present in the liquid

D. Control the liquid discharge