chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 8

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 Review each marked answer and report any item that may be outdated or unclear.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
141. Discharge from a 24 inch pipe of water at 10 ft/sec will be _____________ ft3/sec?
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A. 32.36

B. 48.22

C. 125.6

D. 7.65

142. The fluid property, due to which, mercury does not wet the glass is__________________?
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A. Cohesion

B. Viscosity

C. Adhesion

D. Surface tension
143. The time of oscillation of a floating body is _________________?
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A. Dependent on the buoyant forces only

B. Independent of the Metacentric height

C. None of these

D. Longer, if Metacentric height is increased

144. The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the _____________ length?
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A. None of these

B. Transition

C. Prandtl mixing

D. Equivalent

145. A Newtonian fluid is that__________________?
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A. For which shear & deformation are related as T = ? (?u/?y)

B. Which needs a minimum shear, before it starts deforming

C. Which follows Newtons law of motion

D. None of these

146. Velocity distribution for flow between two fixed parallel plates_________________?
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A. Is constant over the entire cross-section

B. Varies parabolically across the section

C. None of these

D. Is zero at the plates and increases linearly to the mid-plane

147. The fluid velocity varies as the cube of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop for ____________ fluid?
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A. Dilatent

B. Newtonian

C. Bingham plastic

D. Pseudo-plastic
148. For the same flow rate of a fluid, the pressure drop is the least for ____________________?
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A. Flow-nozzle

B. ?p is same for all

C. Orificemeter

D. Venturimeter
149. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stokes law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?
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A. One fourth as that of A

B. Four times as that of A

C. Same as that of A

D. Twice as that of A

150. The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s) ?
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A. 0.44

B. 0.24

C. 24000

D. 24

151. Dimension of kinematic viscosity is_____________________?
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A. L2T-2

B. MLT-1

C. L2T

D. L2T-1
152. Enamels and paints are generally _______________ fluid?
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A. Rheopectic

B. Thixotropic

C. Pseudo-plastic

D. Dilatant

153. Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is _____________ mm?
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A. > 12.5

B. < 10

C. 4

154. In which of the following cases, it is possible for flow to occur from low pressure to high pressure ?
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A. Impossible in a constant cross-section conduit

B. Flow of air downward in a pipe

C. Flow of liquid upward in a vertical pipe

D. Flow through a converging section
155. For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, ? = fluid viscosity ) ?
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A. ??

B. 1/?

C. 1/??

D. ?

156. A streamline is a line in flow field _________________?
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A. Along which a fluid particle travels

B. That is traced by all the fluid particles passing through a given point

C. None of these

D. Such that at every point on it, the velocity is tangential to it
157. Momentum correction factor used in fluid flow problems accounts for the__________________?
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A. Non uniform direction of velocities at inlet & outlet sections

B. Change in pressure

C. Change in total energy

D. Change in direction of flow

158. A bed of spherical particles (specific gravity 2.5) of uniform size 1500 ?m is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Erguns equation for the above fluid-particle system (in SI units) is given below : ? P/L = 375 103 VOM + 10.94 106 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is_________________?
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A. 24 mm/s

B. 12 mm/s

C. 16 mm/s

D. 28 mm/s

159. ______________ pumps are axial flow pumps?
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A. Propeller

B. None of these

C. Turbine

D. Diffuser

160. The velocity profile for turbulent flow through a closed conduit is_______________?
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A. Parabolic

B. Logarithmic

C. Linear

D. Hyperbolic