chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 5

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 Review each marked answer and report any item that may be outdated or unclear.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
81. Lower BWG means _____________ of the tube?
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A. Lower thickness

B. Inner diameter

C. Outer diameter

D. Lower cross-section
82. Which of the following is most prone to pulsating discharge flow ?
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A. Reciprocating pump

B. Gear pump

C. Axial flow pump

D. Centrifugal pump

83. If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is_________________?
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A. Same in both the tubes

B. Greater in 1 mm dia tube

C. Greater in 0.5 mm dia tube

D. Zero in both the tubes

84. Which of the following is not a dimension-less parameter ?
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A. Kinematic viscosity

B. Pressure-co-efficient

C. Weber number

D. Froude number

85. Purpose of relief valve in a reciprocating pump is to___________________?
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A. Reduce the discharge pressure

B. Control the rate of discharge

C. Facilitate unidirectional flow of liquid

D. Protect the pump against developing excessive pressure
86. Velocity head on sudden enlargement in a horizontal pipe is converted into ______________ head?
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A. Elevation

B. Pressure

C. Both A. & B.

D. Neither A. nor B.

87. Slurries can be most conveniently pumped by a _______________ pump?
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A. Reciprocating

B. Screw

C. Centrifugal

D. Gear

88. Pressure drop for turbulent fluid flow through a circular pipe is given by_________________?
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A. 4f (L/D) (v2/2gc). ?

B. 32?LV/gc.D2

C. 64/Re

D. f (L/D) (v2/2gc). ?

89. For a given fluid flow rate, which of the following incurs maximum head loss ?
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A. All of them incur the same head loss

B. Orificemeter

C. Flow nozzle

D. Venturimeter

90. Transition length for turbulent flow in smooth pipe is equal to _____________ times the pipe diameter?
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A. 500

B. 0.5

C. 50

D. 5

91. The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is _______________ the mean velocity of flow?
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A. Directly proportional to

B. Inversely proportional to square of

C. Inversely proportional to

D. Directly proportional to square of
92. Pressure drop in a fluidised bed reactor is ______________ that in a similar packed bed reactor?
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A. Less than

B. None of these

C. Same as

D. Greater than
93. In case of a pipe exit fitted with a nozzle, the____________________?
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A. Conversion of kinetic head to pressure head is facilitated

B. Conversion of pressure head to kinetic head is facilitated

C. Power transmitted through the nozzle is maximum, when the head lost due to friction in the

D. e is equal to one third of the total supply head

E. Both B. and C.
94. Prandtl mixing length is___________________?
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A. Applicable to laminar flow problems

B. Zero at the pipe wall

C. A universal constant

D. None of these

95. A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is___________________?
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A. 14.1

B. 28.2

C. 56.22

D. 5

96. The continuity equation of fluid mechanics utilises the principle of conservation of _________________?
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A. Momentum

B. Mass

C. Energy

D. Both B. & C.

97. Discharge in laminar flow through a pipe varies________________?
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A. As the square of the diameter

B. As the square of the radius

C. Inversely as the viscosity

D. Inversely as the pressure drop

98. Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m) ________________?
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A. N3D5

B. N2D

C. N2D3

D. ND2

99. Forces acting on a particle settling in fluid are _____________ forces?
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A. Gravitational & buoyant

B. Centrifugal & drag

C. External, drag & viscous

D. Gravitational or centrifugal buoyant drag
100. Fanning friction factor for laminar flow of fluid in a circular pipe is____________________?
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A. Not a function of the roughness of pipe wall

B. Inversely proportional to Reynolds number

C. Both A. & B.

D. Neither A. nor B.