chemical engineering Mcqs
1001. Permanent hardness of water can be removed by___________________?
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A. Adding Ca(OH)2

B. None of these

C. Boiling it with Na2CO3

D. Boiling

1002. Rosin soap is added during paper manufacture to____________________?
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A. None of these

B. Impart adhesive properties

C. Impart resistance to penetration by liquids

D. Improve opacity

1003. A mixture of chlorine & sodium bromide acts as a/an_________________?
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A. Insecticides

B. Analgesic drug

C. Hydrogenation catalyst

D. Fire retardant
1004. The end bleaching agent used to move last traces of colour bodies from the pulp is ____________________?
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A. SO2 gas

B. Chlorine dioxide (ClO2)

C. MgO

D. Mercaptans

1005. Phenol is mainly used____________________?
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A. To produce phenol formaldehyde

B. To produce benzene

C. As a plasticiser for unsaturated polyester

D. To produce polyester resin

1006. Neoprene is a__________________?
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A. Polyester

B. Monomer

C. Synthetic rubber

D. None of these

1007. Hard water____________________?
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A. Does not affect the lather formation by soap

B. All A, B. and C

C. Pollutes the water stream

D. Is not unfit for drinking purpose
1008. 99.5% purity oxygen is used in_____________________?
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A. All A, B, and C.

B. Hospitals for medicinal purposes

C. Gas masks and artificial breathing apparatus

D. Cutting and welding by oxy-acetylene flame

1009. DDT stands for___________________?
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A. Dichloro-diphenyl-trichloromethane

B. Dichloro-diphenyl-trichloroethane

C. Diethyl-diphenyl-trichloromethane

D. diphenyl-dichloro-trichloromethane

1010. Pick out the wrong statement?
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A. Processing of thermosetting plastics is ideally done by injection moulding

B. Stretch forming is a process of cold drawing

C. Mass production of seamless pipes are done by electrical resistance welding (ERW)

D. Processing of thermoplastics is ideally done by compression moulding

1011. Enzymes are organic catalysts used in the ____________________ reactions ?
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A. Biochemical

B. Chemical

C. Electrochemical

D. Photochemical

1012. Hydrazine is used in water treatment for the removal of___________________?
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A. Colloidal impurities

B. Chlorinous taste

C. Dissolved oxygen

D. Turbidity

1013. Manufacture of phthalic anhydride uses ______________ as a catalyst ?
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A. Ni

B. Al2O3

C. Cr

D. V2O5
1014. Which of the following contains least amount of N2 ?
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A. Water gas (blue gas)

B. Producer gas

C. Blast furnace gas

D. Coke oven gas
1015. Nylon-6 as compared to Nylon-66 is having higher___________________?
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A. Hardness

B. Abrasion/resistance

C. None of these

D. Melting point

1016. Penicillin is made employing _______________ fermentation process?
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A. Aerobic batch

B. Anaerobic batch

C. Continuous

D. None of these

1017. Separation of fresh water from sea water can be done by the _______________ operation ?
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A. Reverse osmosis

B. Osmosis

C. Absorption

D. Adsorption

1018. Which one of the following is not an elastomer ?
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A. None of these

B. Polyisoprene

C. Nitrile-butadiene

D. Neoprene

1019. Hydrazine (N2H4) is used mainly as a/an__________________?
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A. Detergents additive

B. None of these

C. Rocket fuel

D. Explosive

1020. ___________________ glass is used for the manufacture of optical glass ?
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A. Flint

B. Pyrex

C. Crookes

D. Soda

1021. The basic constituent of vegetable oils is ___________________?
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A. Mono esters

B. Fatty alcohol

C. Triglyceride

D. Fatty acids

1022. Which of the following processes can remove both temporary as well as permanent hardness of water ?
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A. None of these

B. Boiling

C. Distillation

D. Filtration

1023. Solvay process as compared to dual process (i.e. modified Solvay process) ?
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A. Can use low grade brine

B. Has less corrosion problems

C. Involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl

D. Both B. and C.
1024. Catalyst used in the oxidation of benzene to produce Maleic anhydride is ______________________?
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A. V2O5

B. Ni

C. Cr

D. Pt

1025. Mannheim furnace is used in the manufacture of_________________?
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A. Hydrochloric acid

B. Corundum

C. H2SO4 by Chamber process

D. Calcium carbide

1026. Which is a high grade pulp ?
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A. Rag pulp

B. Mechanical pulp

C. Sulphate pulp

D. Sulphite pulp

1027. CO & H2 are the constituents of___________________?
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A. All A., B. and C.

B. Water gas

C. Coke oven gas

D. Producer gas

1028. Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of_____________________?
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A. Nitric acid

B. Hydrochloric acid

C. Formic acid

D. Methyl alcohol

1029. Nylon-66 is so named because the____________________?
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A. Polymer was first synthesised in 1966

B. Number of carbon atoms between two nitrogen atoms are 6

C. Average degree of polymerisation of the polymer is 1966

D. Number of nitrogen atoms between two carbon atoms are 6

1030. Favourable conditions for the liquefaction of gases in general are _____________________?
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A. Low pressure & high temperature

B. High pressure & low temperature

C. High pressure & high temperature

D. Low pressure & low temperature

1031. Multistage catalytic converter is not used in the___________________?
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A. Conversion of SO2 to SO3

B. NH3 synthesis reaction

C. Both A. and B.

D. Neither A. nor B.

1032. What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell ?
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A. O2 & H2

B. Cl2 & Na

C. Cl2 & H2

D. Cl2, H2 & NaOH solution
1033. Bio-degradable detergents ___________________?
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A. Have an isoparaffinic structure

B. Should not be used as it spoils the cloth

C. Pose problem in sewerage plant

D. Can be readily oxidised
1034. Sand and ______________ is fused at 1300C, to produce sodium silicate ?
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A. Coke

B. Sodium sulphate

C. Limestone

D. Soda ash
1035. Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because__________________?
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A. It reduces viscosity and imparts fluidity for its transportation through pipelines at economic

B. All A, B. and C.

C. ssure drop</strong>

D. Tar neutralises the residual acids present in pitch

E. Its calorific value is very less

1036. The main use of HCl is in the___________________?
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A. Treatment of spent fuel of nuclear reactor

B. None of these

C. Manufacture of cationic detergent

D. Drilling of petroleum wells and pickling of steel sheets
1037. Which of the following is an unsaturated fatty acid ?
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A. Palmitic acid

B. Stearic acid

C. Lauric acid

D. Oleic acid
1038. Sulphuric acid completely saturated with sulphur trioxide is called_________________?
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A. Sulphurous acid

B. Oleum

C. Dilute sulphuric acid

D. Concentrated sulphuric acid
1039. Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction ?
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A. Reduction of Na+ ions

B. Reduction of Cl- ions

C. Oxidation of Cl- ions

D. Oxidation of Na+ ions

1040. In an integrated steel plant, NH3 present in coke oven gas is normally recovered as_________________?
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A. NH4Cl

B. Liquid NH3

C. (NH4)2 NO3

D. (NH4)2SO4
1041. Cellulose content of bamboo and ideal fibrous raw material for the manufacture of paper is ______________ percent?
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A. 95

B. 50

C. 80

D. 10

1042. Varnish does not contain____________________?
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A. Pigment

B. Anti-skimming agent

C. Thinner

D. Dryer

1043. Temperature during hydrogenation of oil should not be more than 200C, otherwise it will result in______________________?
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A. Hydrogen embrittlement

B. Pyrolysis of oil

C. Sintering of porous catalyst

D. All A, B. and C.
1044. Commercial production of Vanaspati is done by _______________ of edible vegetable oils ?
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A. Hydrocracking

B. Hydrolysis

C. Oxidation

D. Hydrogenation
1045. Stereospecific agents are exemplified by________________?
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A. Radiation

B. Supported metal oxide catalysts

C. Ziegler catalysts

D. All A , B. & C
1046. The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to___________________?
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A. None of these

B. Remove lignin by way of crystallisation

C. Increase the cellulose content

D. Avoid mechanical weakening of fibre
1047. Industrial production of chloroform requires acetone and_____________________?
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A. Phosgene

B. Ammonium chloride

C. Chlorine

D. Calcium hypochlorite
1048. Nicotine is___________________?
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A. A volatile alkaloid

B. Obtained by treating by-products of the tobacco processing industry

C. Both A. and B.

D. Neither A. nor B.

1049. Refractory bricks burnt at very high temperature have got______________?
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A. Greater resistance to corrosion by slags

B. None of these

C. Less resistance to corrosion by slags

D. High spalling tendency

1050. Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material ?
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A. Teflon

B. Slag cement

C. Glasses

D. Porcelain/Potteries