chemical engineering MCQs – Page 61

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 Review each marked answer and report any item that may be outdated or unclear.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
1201. Permanent hardness of water can be removed by_________________?
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A. Passing it through sodium hexametaphosphate

B. Treating it with zeolites

C. Addition of soda ash to it

D. All A , B, and C.
1202. Phthalic anhydride is used____________________?
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A. As plasticisers

B. In insecticides manufacture

C. For making nylon-6

D. In making PVC

1203. ____________________ of rubber decreases after its vulcanisation?
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A. Maximum service temperature

B. Tackiness

C. Tensile strength

D. Resistance to the action of organic solvent

1204. Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo ?
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A. None of these

B. Depithing

C. Digestion

D. Bleaching

1205. One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to_________________?
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A. Adjust the pH of the syrup

B. Remove the coloring matter from the syrup

C. Improve the rate of crystallisation of sugar

D. Reduce the viscosity of the syrup

1206. Poly Vinyl Chloride (P.V.C.) is a ______________ material ?
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A. Thermoplastic

B. Chemically active

C. Thermosetting

D. Fibrous

1207. Nylon-6 is a__________________?
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A. Polyester

B. Thermosetting resin

C. Polyamide

D. None of these

1208. Mercury cells for caustic soda manufacture, compared to diaphragm cells___________________?
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A. None of these

B. Produce lower concentration NaOH

C. Require lower initial investment

D. Require more power

1209. Enamels______________________?
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A. Are same as varnish

B. Give good glossy finish

C. Do not contain pigment

D. Are prepared from non-drying oil

1210. Linde process of gas liquefaction employs__________________?
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A. Merely compressing the gas beyond its critical pressure

B. Adiabatic expansion against a piston or in a turbine

C. Exchange of heat with colder stream

D. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
1211. Bitterns is a/an_________________?
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A. None of these

B. Unsaturated fat

C. By-product of chlor-alkali industry

D. Starting material for the production of iodine

1212. Which of the following is not responsible for causing permanent hardness of water ?
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A. MgCl2

B. None of these

C. CaCl2

D. Ca(HCO3)2
1213. Which of the following paper does not require a filler during manufacture ?
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A. Coloured paper

B. Blotting paper

C. Writing paper

D. Bond paper

1214. Gun powder, which is an explosive comprises of charcoal, sulphur and____________________?
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A. Dynamite

B. Glycerine

C. Salt petre

D. Nitro glycerine

1215. Polymerisation product of C2F4 (carbon tetrafluoride) is called P.T.F.E (poly chloro tetra fluoro ethylene). It is also called___________________?
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A. Epoxy resin

B. Silicone

C. Polyurethane

D. Teflon
1216. Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about _____________ C ?
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A. -103

B. -196

C. -183

D. -53

1217. Major component of flint glass is_____________________?
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A. Lead oxide

B. Silica

C. Alumina

D. Soda

1218. Which allotrope of sulphur is insoluble in carbon disulphide ?
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A. Rhombic sulphur

B. Milk of sulphur

C. Monoclinic sulphur

D. Plastic sulphur
1219. SO2 is bubbled through hot sugar cane juice to_______________?
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A. Act as an acidifying agent

B. Increase the amount of molasses

C. Increase the crystal size

D. Increase its concentration

1220. In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because___________________?
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A. Scale formation in the absorber is to be avoided

B. SO3 gas is sparingly soluble in water

C. The purity of acid is affected

D. Water forms an acid mist, which is difficult to absorb