chemical engineering MCQs – Page 310

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 Review each marked answer and report any item that may be outdated or unclear.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
6181. 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.

6182. In continuous fluidisation_________________?
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A. Solids are completely entrained

B. The pressure drop is less than that for batch fluidisation

C. Velocity of the fluid is very small

D. There is no entrainment of solids

6183. PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ C?
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A. 1670

B. 1520

C. 1630

D. 1730
6184. For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as_________________?
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A. d2

B. d? 2

C. d4

D. d

6185. Equivalent length of a pipe fitting is____________________?
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A. Independent of Reynolds number

B. Dependent on the length of the pipe

C. None of these

D. Dependent on Reynolds number
6186. High refractoriness of refractory bricks means, that it has a________________?
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A. High resistance to fusion

B. High spalling resistance

C. Low porosity

D. Low spalling resistance

6187. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?
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A. Silica

B. Semi-silica

C. Bakelite impregnated or fused periclase

D. Fireclay

6188. Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will _____________ the gas discharge pressure?
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A. Increase

B. Exponentially decrease

C. Decrease

D. Not change

6189. Which brick undergoes maximum shrinkage on drying ?
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A. Chromite bricks

B. Tar bonded dolomite bricks

C. Magnesite bricks

D. Fireclay bricks
6190. Porosity of fireclay refractories is _______________ percent?
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A. 10-May

B. 35-50

C. 10-25

D. 25-35

6191. In Newtons law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is___________________?
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A. 0.044

B. 4.4

C. 0.44

D. 44

6192. Test piece for determination of RUL of a refractory is heated in a/an____________________?
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A. Electric furnace

B. Oxidising atmosphere

C. Reducing atmosphere

D. Neutral atmosphere

6193. The maximum linear expansion of silica bricks during firing is about ______________ percent?
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A. 3.5

B. 0.5

C. 1

D. 2

6194. Permeability of bricks is a measure of the_________________?
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A. Refractoriness

B. Melting point

C. Expansion during heating

D. Rate at which a fluid will pass through the pores
6195. A pressure of 10 m head of water is equivalent to ______________ kN/m2?
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A. 98

B. 49

C. 196

D. 147

6196. Plunger pumps are used for__________________?
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A. None of these

B. Viscous mass

C. Higher pressure

D. Slurries

6197. Pick out the correct statement pertaining to transition/ entrance length in fluid flow ?
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A. 5. D.NRe

B. h that velocity profile does not change downstream, is called the transition length

C. Transition length for laminar flow of Newtonian fluids in a pipe of diameter d is equal to

D. All A., B. and C.

E. The length of entrance region of pipe, in which full development of fluid flow takes place

F. al to 50 D

6198. Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?
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A. Silica

B. Mullite

C. High duty fireclay

D. Carborundum

6199. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to__________________?
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A. Slag attack

B. Thermal spalling

C. CO attack

D. Fusion under load

6200. In which of the following body shapes, the pressure drag is large compared to the friction drag ?
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A. None of these

B. Two dimensional body

C. Stream line body

D. Bluff body