chemical engineering MCQs – Page 312

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 Review each marked answer and report any item that may be outdated or unclear.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
6221. Identification of pipelines carrying different liquids and gases is done by the ____________ of the pipe?
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A. Altitude

B. None of these

C. Colour

D. Diameter

6222. Thoria__________________?
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A. Has high resistance to basic slags

B. Which is expensive & radioactive, is used in crucibles for melting high purity metals

C. Has high fusion temperature (> 3000C) but poor resistance to thermal shock

D. All A., B. and C.
6223. Magnesite bricks have poor resistance to attack by _____________ slag?
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A. Basic

B. Acid

C. None of these

D. Lime

6224. The maximum delivery pressure of a reciprocating compressor may be about ______________ kg/cm2?
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A. 2000

B. 3000

C. 4000

D. 1000

6225. Ramming masses are used for____________________?
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A. Obtaining monolithic working faces

B. Repairing construction of various furnace parts

C. Both A. & B.

D. Neither A. nor B.

6226. _____________ pump is the most suitable device for discharging a liquid against a pressure of ? 1500 kgf/cm2?
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A. Plunger

B. Piston

C. Centrifugal

D. Vane

6227. Which is a basic refractory ?
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A. None of these

B. Fireclay

C. Silica

D. Chrome magnesite
6228. For laminar flow of Newtonian fluid in a circular pipe, the velocity distribution is a function of the distance d measured from the centre line of the pipe, and it follows a ______________ relationship?
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A. Logarithmic

B. Parabolic

C. Hyperbolic

D. Linear

6229. Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory_________________?
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A. None of these

B. Mortars

C. Cements

D. Castables
6230. Scale up of agitator design requires________________?
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A. Geometrical similarity only

B. Dynamic similarity only

C. Both geometrical and dynamic similarity

D. All geometrical, dynamic and kinematic similarity
6231. What is the value of Fanning friction factor f for smooth pipe at NRe = 106 approximately ?
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A. 0.1

B. 0.3

C. 0.01

D. 0.003
6232. A relief valve__________________?
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A. Unloads a pump

B. Provides back pressure for a cylinder

C. Is a directional control valve

D. None of these

6233. Thermal conductivity of refractory bricks_________________?
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A. Is independent of its porosity and is maximum for insulating bricks

B. Decreases with decreases in porosity

C. Increases with the amount of air entrapped in pores

D. Increases with decrease in porosity
6234. Viscosity of water at 40C lies in the range of___________________?
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A. 1 10-3 to 2 10-3 kg/m.s

B. 0.5 10-3 to 1 10-3 kg/m.s

C. 1 to 2 kg/m.s

D. 0.5 to 1 kg/m.s

6235. Colour of fireclay bricks is_________________?
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A. Black

B. Yellow

C. None of these

D. Light buff to reddish buff
6236. 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.

6237. Magnesite refractories are generally not used in the___________________?
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A. Open hearth furnace

B. Electric furnace walls

C. Burning zone of cement kilns

D. Steel melting furnace
6238. Dilatometer is used for the determination of ______________ of refractories?
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A. Resistance to CO attack

B. Permanent linear change

C. RUL

D. Modulus of rupture

6239. Hot face insulating linings of high purity alumina fused mullite are used, where_________________?
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A. Very high temperatures are involved

B. All A., B. and C.

C. Presence of iron or silica is harmful

D. Highly reducing conditions are involved

6240. The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis. The centre of pressure of a rectangular surface (of width w) immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid) ?
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A. 1/(y/3)

B. 3y/4

C. 2y/3

D. 1/(y/4)