Elastomers Biochemical Engineer MCQs with Answers
The amount of sulphur that is added always determines the extent of the stiffness of vulcanised rubber.
(A). Â False
(B). Â True
(E). None of these
Multiple Choice Question Answer: Â b
Which of the following is the tensile strength(kg/cm 2) of vulcanised rubber?
(A). Â 200
(B). Â 5000
(C). Â 500
(D). Â 2000
(E). None of these
Multiple Choice Question Answer: Â d
Which of the following is the percentage of butadiene and styrene in Buna-S?
(A). Â 75% and 25% respectively
(B). Â 60% and 40% respectively
(C). Â 80% and 20% respectively
(D). Â 50% each
(E). None of these
Multiple Choice Question Answer: Â a
The application of SBR is ____________
(A). Â Conveyor belts for food
(B). Â Printing rollers
(C). Â Oil-resistance foam
(D). Â Lining of tanks
(E). None of these
Multiple Choice Question Answer: Â d
__________ act as a catalyst in preparation of Buna-S
(A). Â Cumene hydroperoxide
(B). Â Hydrogen peroxide
(C). Â Benzoyl peroxide
(D). Â Acrylonitrile
(E). None of these
Multiple Choice Question Answer:Â a
The Buna-N is always prepared by the co-polymerisation of the butadiene and acrylonitrile in an emulsion system.
(A). Â Â False
(B). Â True
(E). None of these
Multiple Choice Question Answer: Â b
___________ has the best resistance to oils
(A). Â Nitrile rubber
(B). Â Neoprene
(C). Â Natural rubber
(D). Â Styrene rubber
(E). None of these
Multiple Choice Question Answer: Â a
_____________ act as a catalyst in the preparation of butyl rubber
(A). Â Anhydrous AlCl3
(B). Â Cumene hydroperoxide
(C). Â Lewis base
(D). Â Grignard reagent
(E). None of these
Multiple Choice Question Answer: Â a
The statement that is incorrect about the SBR is __________
(A). Â This has high abrasion resistance
(B). Â This has low load bearing capacity
(C). Â This swells in oils and solvents
(D). Â This has low oxidation resistance
(E). None of these
Multiple Choice Question Answer: Â b
Which of the following is the solvent that is used in the preparation of butyl rubber?
(A). Â Methyl iodide
(B). Â Methyl halide
(C). Â Methyl sulphide
(D). Â Methyl chloride
(E). None of these
Multiple Choice Question Answer: Â d
Which of the following is the major constituent of butyl rubber?
(A). Â Chloroprene
(B). Â Isoprene
(C). Â Isobutylene
(D). Â Acrylonitrile
(E). None of these
Multiple Choice Question Answer:Â c
The butyl rubber is always soluble in the hydrocarbon solvents but has excellent resistance to the polar solvents like alcohol and acetone Due to its hydrocarbon nature
(A). Â False
(B). Â True
(E). None of these
Multiple Choice Question Answer: Â b
Which of the following is the Natural rubber?
(A). Â Acrylonitrile
(B). Â Ethylene glycol
(C). Â Butadiene
(D). Â Poly isoprene
(E). None of these
Multiple Choice Question Answer: Â d
Not the essential structural requirement of an elastomer is ______________
(A). Â Rigidity in structure
(B). Â Weak intermolecular forces
(C). Long flexible chains
(D). Â Occasional cross-linking
(E). None of these
Multiple Choice Question Answer: Â a
Not an application of neoprene is ____________
(A). Â Conveyor belts
(B). Â Wire and cable insulation
(C). Â Printing rollers
(D). Â Adhesives
(E). None of these
Multiple Choice Question Answer: Â c
In the vulcanisation process, with wich of the following the raw rubber is heated?
(A). Â Oxygen
(B). Â Calcium
(C). Â Carbon
(D). Â Sulphur
(E). None of these
Multiple Choice Question Answer: Â d
Which of the following is the structural formula of isoprene?
(A). Â 2-benzyl-1,3-butadiene
(B). Â 3-benzyl-1,2-butadiene
(C). Â 2-methyl-1,3-butadiene
(D). Â 3-methyl-1,2-butadiene
(E). None of these
Multiple Choice Question Answer: Â c
At which of the following temperature the raw rubber is heated for the vulcanisation process?
(A). Â 0-10 0C
(B). Â 10-50 0C
(C). Â 100-140 0C
(D). Â 50-100 0C
(E). None of these
Multiple Choice Question Answer: Â c
Which of the following is the incorrect statement?
(A). Â Raw rubber is durable
(B). Â Raw rubber is attacked by oxidizing agent
(C). Â In the organic solvents, it always undergoes the swelling and
the disintegration
(D). Â The Raw rubber is always weak and have very low tensile strength
(E). None of these
Multiple Choice Question Answer: Â a
The incorrect statement is that the Vulcanised rubber has ______________
(A). Â high elasticity
(B). Â only slight tackiness
(C). Â excellent resilience
(D). Â tensile strength 10 times more than raw rubber
(E). None of these
Multiple Choice Question Answer: Â a
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