chemical engineering MCQs – Page 311

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

6201. Foot valves are provided in the suction line of a centrifugal pump to ____________________?
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A. Minimise the fluctuation in discharge

B. Remove the contaminant present in the liquid

C. Avoid priming, every time we start the pump

D. Control the liquid discharge

6202. Alumina-graphite bricks are used for lining the ____________________?
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A. Slide gate in teeming laddies

B. Continuous casting systems

C. Both A. and B.

D. Neither A. nor B.

6203. A tube is specified by its____________________?
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A. Outer diameter only

B. Thickness & outer diameter both

C. Inner diameter

D. Thickness only

6204. The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is________________?
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A. 0.1

B. 0.55

C. 1.85

D. 0.95

6205. A hydraulic accumulator comprises of__________________?
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A. A storage device and a control valve

B. Two pistons and two cylinders

C. A storage tank and a ram pump

D. A cylinder and a plunger

6206. 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. < 0.5

D. 1

6207. Choose the set of pressure intensities that are equivalent ?
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A. 4.33 psi, 10 ft. of water, 20.7 inches of Hg

B. 10 psi, 19.7 ft. of water, 5.3 inches of Hg

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

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

6208. In the complete turbulence zone (in rough pipes), the____________________?
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A. Friction factor is independent of the relative roughness

B. Rough and smooth pipes have the same friction factor

C. Laminar film covers the roughness projections

D. Friction factor depends upon NRe only

6209. The boundary layer is that part of a moving fluid, in which the fluid velocity is_________________?
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A. Affected by the presence of a solid boundary

B. Constant

C. All A., B. and C.

D. Affected by the fluid flow pressure

6210. Discharge in laminar flow through a pipe varies________________?
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A. As the square of the diameter

B. Inversely as the pressure drop

C. Inversely as the viscosity

D. As the square of the radius

6211. In case of turbulent flow of fluid through a circular pipe, the __________________?
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A. file at the wall are more</strong>

B. Velocity profile becomes flatter and flatter with increasing Reynolds number

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

D. Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity

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

6212. Drag is defined as the force exerted by the___________________?
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A. None of these

B. Fluid on the solid in a direction opposite to flow

C. Fluid on the solid in the direction of flow

D. Solid on the fluid

6213. 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. Elevation along vertical direction

B. Square of the radial distance

C. Radial distance linearly

D. Inverse of the radial distance

6214. Thermal diffusivity of a refractory brick is high, when its ____________ is high?
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A. Specific heat

B. Density

C. None of these

D. Thermal conductivity

6215. Which of the following bricks should not be used, if the furnace is to be used intermittently ?
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A. Sillimanite

B. Silica bricks

C. Silicon carbide bricks

D. Firebricks

6216. The ratio of pressure forces to inertial forces is called the _______________ number?
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A. Euler

B. Reynold

C. Mach

D. Froude

6217. Maximum apparent porosity of magnesite bricks is about _____________ percent?
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A. 58

B. 24

C. 8

D. 44

6218. Self-priming centrifugal pump can be used for________________?
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A. All A., B. and C.

B. Booster service

C. Pumping industrial wastes

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

6219. Pressure drop in packed bed for turbulent flow is given by the ______________ equation?
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A. Kozeny-Carman

B. Hagen-Poiseuilles

C. Blake-Plummer

D. Levas

6220. Carbon refractories_____________________?
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A. Have extremely low thermal & electrical conductivities

B. Do not resist temperature fluctuations

C. Do not burn/oxidise, when exposed to air on heating

D. Are not attacked by slags, as they are not wetted by melts

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