chemical engineering MCQs – Page 259

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 Review each marked answer and report any item that may be outdated or unclear.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
5161. Which of the following is a copolymer ?
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A. PVC

B. Bakelite

C. Polythene

D. Teflon

5162. The monomer for the production of neoprene rubber is_________________?
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A. Acetylene

B. None of these

C. Chloroprene

D. Isoprene

5163. Which of the following is the most harmful for the human being ?
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A. X-rays

B. ?-rays

C. ?-rays

D. Ultra violet rays

5164. Mastication of rubber means_______________?
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A. Depression of its freezing point

B. Its softening

C. Improving its curing rate

D. A treatment to retard its deterioration due to oxidation

5165. Which of the following polymers is used for making a non stick coating on frying pans ?
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A. Bakelite

B. Perspex

C. Teflon

D. PVC

5166. Pick out the wrong statement ?
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A. Characterisation factor of paraffinic crude oil is more than 12

B. Abel apparatus is used for determining flash points below 50C

C. An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

D. Pensky-Marten apparatus is used for determining flash points above 50C

5167. Pick out the wrong statement ?
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A. Molecularity of the reaction is always a whole number greater than zero

B. Visible radiation provides the necessary activation energy in photochemical reactions

C. For a second order reaction, the slope of the graph/plot between rate and (concentration) is

D. The order and molecularity of a complex reaction may not be the same

E. al to the rate constant (k)

5168. Research reactors are normally meant for_____________________?
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A. Producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron

B. Power generation

C. bardment on different materials</strong>

D. None of these

E. Accelerating the neutrons

5169. Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its_________________?
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A. Weathering characteristics

B. Strength

C. Elasticity

D. Plasticity

5170. Perspex can be used as a substitute of glass. Its monomer is__________________?
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A. Tetrafluoroethylene

B. DMT

C. Methyl methacrylate

D. Butadiene

5171. Celluloid is__________________?
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A. Regenerated cellulose

B. Cellulose acetate

C. Cellulose nitrate

D. Cellulose acetate butyrate

5172. Buna-S is a _______________ material?
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A. Plastic

B. Resinous

C. Fibrous

D. Rubbery
5173. The 92U238 emits an a-particle. The product is____________________?
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A. 90U238

B. 92U236

C. 90U234

D. 90U236

5174. Silicone resins, which are highly water repellent and has good heat resistance cannot be used___________________?
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A. Hydraulic fluid for heat transfer

B. As room temperature adhesive

C. Resin for lamination

D. As grease & lubricant

5175. Alkyd resin e.g., glyptal resin formed by Phthalic anhydride and glycerine is not used_______________?
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A. For surface coating of automobiles & air crafts

B. As plasticiser for PVC & nitrocellulose

C. For film forming materials

D. For fibre making
5176. Pick out the wrong statement ?
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A. Autocatalytic reactions are exemplified by microbial fermentation reactions

B. The slowest step has the greatest influence on the overall reaction rate in case of an

C. eversible series reaction

D. The fractional conversion at any time is same for both the constant as well as the variable

E. ume system in case of an irreversible unimolecular type first order reaction

F. Hydrolysis of ester in presence of alkali or acid is a zero order reaction
5177. Pick out the wrong statement?
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A. There is no transfer lag for a single first order system

B. Transfer lag is a characteristic of all higher order systems (other than first order systems)

C. Stirred tank with a water jacket exemplifies an interacting system

D. Transfer lag decreases as the number of stages decreases
5178. Amino resins are used in paper treatment to improve its__________________?
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A. All A., B. & C.

B. Wet rub resistance

C. Folding endurance

D. Wet tear and bursting strength

5179. Pick out the wrong statement?
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A. Out of ?, ?, and ?-rays, the one having maximum penetration power are ?-rays

B. Atoms with same number of protons but different number of nucleons are called isoters

C. The product formed by emission of ?-particle has mass number less by 4 units than the parent nuclide

D. Atoms with same number of nucleons but different number of protons are called isobars

5180. Pick out the wrong statement pertaining to the turbine agitator ?
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A. Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow

B. blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator

C. Turbine agitator should be located at a height not less than one agitator diameter length from

D. meter)

E. bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two

F. tators should be used