chemical engineering MCQs – Page 262

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 Review each marked answer and report any item that may be outdated or unclear.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

5221. Pick out the wrong statement ?
0

A. Cake resistance is independent of the pressure drop

B. For the compressible cake, voidage & the specific resistance of the cake can be assumed to be

C. Gyratory crusher is a coarse crusher

D. stant

E. Crushing of explosive materials are done by employing dry-grinding

5222. Pick out the wrong statement ?
0

A. Chemical reactions with high activation energy are very temperature sensitive

B. n one

C. Half life of a reaction increases with increased initial concentration for reaction orders more

D. The residence time for all the elements of fluid in case of a P.F.R. need not be same

E. A flat velocity profile exists in a plug flow reactor

5223. Cation exchange resins used in water treatment is made from _____________ resin?
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A. Epoxy

B. Amino

C. Phenolic

D. Urea formaldehyde

5224. Zeigler process________________?
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A. Produces low density polythene

B. Employs very high pressure

C. Produces high density polythene

D. Uses no catalyst

5225. Critical energy should be _______________ the neutron binding energy of the atom in order to initiate a nuclear fission?
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A. Equal to

B. Either more or less

C. More than

D. Less than

5226. Polythene is a/an________________?
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A. Condensation polymerisation product

B. Addition polymerisation product

C. None of these

D. Thermosetting material

5227. Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxidant used in rubber ?
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A. Thiokol

B. Carbon

C. Magnesium

D. Alkylated diphenyl amine

5228. Heavy water is used as a moderator in a _____________________?
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A. Molten sodium cooled reactor

B. Candu reactor

C. Boiling water reactor (BWR)

D. Pressurised water reactor (PWR)

5229. Pick out the wrong statement?
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A. Heavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre)

B. Gross calorific value (GCV) of petrofuels is equal to (12400 2100 ?2) where, ? is the specific gravity of the fuel at 15.5C

C. Aromatics have higher specific gravity than paraffins

D. Higher specific gravity of petrofuels means higher C/H ratio

5230. Pick out the wrong statement pertaining to space velocity of flow reactors?
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A. The space velocity of 3 hr-1 means that one third reactor volume of feed at specified

B. being fed into the reactor every hour

C. ditions are being fed into the reactor</strong>

D. The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions

E. None of these

F. The unit of space velocity is (time)-1

5231. Pick out the wrong statement ?
0

A. inity respectively

B. The vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and

C. In an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in longitudinal direction

D. Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a

E. Space time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant

F. ticular duty</strong>

5232. _____________ have the same mass number, but different nuclear charge ?
0

A. None of these

B. Isotones

C. Isobars

D. Isotopes

5233. Density of high density polythene is about __________ gm/c.c ?
0

A. 1.18

B. 1.05

C. 0.95

D. 0.99

5234. ______________ resins are produced by the condensation polymerisation of formaldehyde with urea or melamine?
0

A. Phenolic

B. Epoxy

C. Amino

D. Alkyd

5235. Enriched uranium means that, it contains___________________?
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A. More than 0.71% of U-235

B. No impurities

C. Only fissile material

D. Only fertile material

5236. Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butadiene rubber) are____________________?
0

A. 250C and 1 kgf/cm2

B. 50C and 1 kgf/cm2

C. 50C and 3 4 kg/cm2

D. 250C and 10 kgf/cm2

5237. Pick out the wrong statement ?
0

A. Magnetic separation method can be employed to treat both dry & wet ores

B. Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the

C. imum product size</strong>

D. Gyratory crusher is used for coarse crushing

E. Screens are of stationary, moving and vibratory types

5238. Which of the following is not used as a moderator in nuclear reactor ?
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A. Beryllium

B. Molten sodium

C. Light water

D. Boron hydride

5239. Which of the following polymers belong to the class of formaldehyde resin ?
0

A. None of these

B. Teflon

C. Dacron

D. Melamine resins

5240. Pick out the wrong statement?
0

A. cking process

B. Higher temperature is employed in visbreaking than in thermal cracking

C. Lead susceptibility of petrol produced by catalytic process is more than that produced by

D. rmal cracking

E. Pyrolysis is a mild thermal cracking process

F. Operating pressure and temperature in thermal cracking process is more than that in catalytic

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