chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 4

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 Review each marked answer and report any item that may be outdated or unclear.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
61. In a/an _____________, the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure?
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A. Rotameter

B. Pitot tube

C. Flow nozzle

D. Venturimeter

62. Actual lift of a pump is always less than the theoretical lift and is limited by the__________________________?
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A. Specific gravity & temperature of the liquid

B. Frictional resistance through pipes, fittings & passages

C. All A., B. and C.

D. Leakage & pressure decreasing at higher elevations

63. Fanning friction factor equation applies to the _____________ fluid flow?
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A. Non-isothermal condition of

B. Compressible

C. Both A. and B.

D. Neither A. nor B.
64. The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/?f)-0.4, is called the _____________ equation?
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A. Nikuradse

B. Colebrook

C. Von-Karman

D. Blasius

65. For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the___________________?
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A. Radial distance linearly

B. Inverse of the radial distance

C. Elevation along vertical direction

D. Square of the radial distance
66. With the increase in depth, the hydrostatic pressure in an un-accelerated incompressible fluid (in a constant gravitational field) ?
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A. Increases exponentially

B. Decreases

C. Increases linearly

D. Remain constant

67. In case of turbulent flow of fluid through a circular pipe, the __________________?
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A. Velocity profile becomes flatter and flatter with increasing Reynolds number

B. Point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius)

C. file at the wall are more</strong>

D. Mean flow velocity is about 0.5 times the maximum velocity

E. Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity
68. Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)?
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A. Df + Bf + Wf =0

B. Df + Bf = Wf

C. None of these

D. Df = Bf + Wf

69. A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the new discharge will be __________ litres/minute ?
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A. 750

B. 1000

C. 500

D. 200

70. For steady ideal fluid flow, the Bernoullis equation states that the_________________?
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A. Energy is constant throughout the fluid

B. Velocity is constant along a stream line

C. None of these

D. Energy is constant along a stream line, but may vary across stream lines
71. Glass pipes can be joined by__________________?
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A. Soldering

B. Flanges

C. Bell and spigot joint

D. Welding

72. An isentropic process is the one, in which_________________?
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A. pvr= constant

B. pvr = constant, and process is reversible

C. None of these

D. pv = constant

73. Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will _____________ the gas discharge pressure?
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A. Decrease

B. Increase

C. Exponentially decrease

D. Not change

74. For the same terminal conditions and fitting size, the least friction loss is incurred in a/an ?
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A. Union

B. T-joint

C. 45 elbow

D. 90bend

75. What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides changes ?
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A. Linear deformation

B. Angular deformation

C. Rotation

D. Translation

76. The ______________ pressure is measured by a static tube?
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A. Total

B. Static

C. Dynamic

D. None of these

77. The ratio of inertial forces to viscous forces is called the ______________ number?
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A. Mach

B. Weber

C. Reynold

D. Froude

78. In parallel pipe problems, the__________________?
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A. Discharge is the same through all the pipes

B. Head loss is the same through each pipe

C. None of these

D. Total head loss is equal to the sum of the head losses through each pipe

79. A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now_________________?
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A. Increase

B. Decrease

C. Remain same

D. Data insufficient to predict

80. The maximum discharge through a circular channel takes place, when the depth of the fluid flow is ______________ times the pipe diameter?
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A. 0.5

B. 0.25

C. 0.66

D. 0.95