8247 + Mcqs in Chemical Engineering Page 69 McqOptions

3401.	The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm2/gm.
A.	800
B.	1600
C.	4000
D.	8500
Answer» C. 4000

Discussion

3402.	Commercial production of calcium carbide requires limestone and __________ as raw materials.
A.	coke
B.	sand
C.	soda ash
D.	fuel oil
Answer» C. soda ash

Discussion

3403.	Which one of the following is not likely to be a constituent of vegetable oils ?
A.	Citric acid
B.	Oleic acid
C.	Stearic acid
D.	Glycerol
Answer» B. Oleic acid

Discussion

3404.	Nitroglycerene absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as a controlled explosive called dynamite. The raw material used for its manufacture are glycerene, nitric acid and
A.	sulphuric acid
B.	phosphoric acid
C.	hydrochloric acid
D.	hydroflouric acid
Answer» B. phosphoric acid

Discussion

3405.	The process involved in converting rubber into a thin sheet or coating it on fabric is called
A.	extrusion
B.	mastication
C.	calendering
D.	valcanisation
Answer» D. valcanisation

Discussion

3406.	Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.
A.	endothermic
B.	exothermic
C.	irreversible
D.	both (b) and (c)
Answer» E.

Discussion

3407.	Molasses is the starting material for the production of
A.	alcohol
B.	essential oil
C.	fatty acids
D.	massecuite
Answer» B. essential oil

Discussion

3408.	BHC (Benzene hexachloride) is made by the chlorination of benzene
A.	which is an addition reaction.
B.	which is a substitution reaction.
C.	in absolute dark.
D.	in presence of sunlight.
Answer» B. which is a substitution reaction.

Discussion

3409.	Fish contains about __________ percent oil.
A.	5
B.	10
C.	20
D.	35
Answer» D. 35

Discussion

3410.	The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to
A.	avoid mechanical weakening of fibre.
B.	remove lignin by way of crystallisation.
C.	increase the cellulose content.
D.	none of these.
Answer» B. remove lignin by way of crystallisation.

Discussion

3411.	Polymethyl methacrylate (PMMA) is known as
A.	bakelite
B.	teflon
C.	perspex
D.	nylon-6
Answer» D. nylon-6

Discussion

3412.	Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.
A.	chromium
B.	arsenic
C.	copper
D.	mangnese
Answer» D. mangnese

Discussion

3413.	Percentage of alcohol in beer may be around __________ percent.
A.	2-8
B.	18-23
C.	27-32
D.	1-4
Answer» B. 18-23

Discussion

3414.	Which is the most suitable dye for synthetic fibres ?
A.	Acid dye
B.	Azoic dye
C.	Pigment dye
D.	Mordant dye
Answer» B. Azoic dye

Discussion

3415.	Hydrolysis of sugar is called
A.	hydration
B.	inversion
C.	esterification
D.	none of these
Answer» C. esterification

Discussion

3416.	Sulphuric acid completely saturated with sulphur trioxide is called
A.	concentrated sulphuric acid.
B.	oleum.
C.	sulphurous acid.
D.	dilute sulphuric acid.
Answer» B. oleum.

Discussion

3417.	__________ is used as a flux in the smelting of copper ore like chalcopyrite.
A.	Coke breeze
B.	Lime powder
C.	Silica/quartz
D.	Dolomite
Answer» D. Dolomite

Discussion

3418.	Phenol formaldehyde is produced by condensation polymerisation. It is also known as
A.	teflon
B.	bakelite
C.	polyester
D.	nylon-66
Answer» C. polyester

Discussion

3419.	Penicillin is separated from fermented broth by
A.	extraction with amyl or butyl acetate.
B.	ternery azeotropic distillation.
C.	evaporation in calendria.
D.	extractive distillation.
Answer» B. ternery azeotropic distillation.

Discussion

3420.	__________ process is used for producing soda ash.
A.	Chamber
B.	Chance
C.	Tromp
D.	Solvay
Answer» E.

Discussion

3421.	Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on
A.	slaked lime
B.	soda lime
C.	calcium perchlorate
D.	none of these
Answer» B. soda lime

Discussion

3422.	Which of the following is an unsaturated fatty acid ?
A.	Lauric acid
B.	Palmitic acid
C.	Stearic acid
D.	Oleic acid
Answer» E.

Discussion

3423.	The yield of tar from high temperature carbonisation of dry coal is about __________ percent.
A.	3
B.	12
C.	22
D.	0.3
Answer» B. 12

Discussion

3424.	The most widely used coagulant for removing suspended impurities from water is
A.	bleaching powder
B.	chlorine
C.	calcium sulphate
D.	alum
Answer» E.

Discussion

3425.	__________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.
A.	Chlorine
B.	Ammonium chloride
C.	Sodium carbonate
D.	Sodium bi-carbonate
Answer» B. Ammonium chloride

Discussion

3426.	Phthalic anhydride is used
A.	in making PVC
B.	as plasticisers
C.	in insecticides manufacture
D.	for making nylon-6
Answer» C. in insecticides manufacture

Discussion

3427.	Lubricating greases are a mixture of
A.	mineral oil, soap and additives.
B.	mineral oil and metallic soap.
C.	mineral oil and fatty oil.
D.	fatty oil and metallic soap.
Answer» B. mineral oil and metallic soap.

Discussion

3428.	Metallic soap is __________ salt of fatty acids.
A.	sodium
B.	potassium
C.	both sodium & potassium
D.	aluminium or calcium
Answer» E.

Discussion

3429.	Bitterns is a/an
A.	unsaturated fat.
B.	starting material for the production of iodine.
C.	by-product of chlor-alkali industry.
D.	none of these.
Answer» E.

Discussion

3430.	Chalcopyrite is the main ore of
A.	copper
B.	lead
C.	tin
D.	iron
Answer» B. lead

Discussion

3431.	Low temperature carbonisation of coal takes place at __________ C.
A.	300
B.	1100
C.	700
D.	900
Answer» D. 900

Discussion

3432.	Shaving soaps are
A.	soft potassium soaps (potassium salt of fatty acid) with free stearic acid to give lather a lasting property.
B.	metalic soaps compounded with frothing agents.
C.	high free alkali soaps having excess of cane sugar and alcohol.
D.	none of these
Answer» B. metalic soaps compounded with frothing agents.

Discussion

3433.	Extraction of __________ employs an electrolytic process.
A.	aluminium
B.	silver
C.	copper
D.	all (a), (b) and (c)
Answer» B. silver

Discussion

3434.	Dechlorination of treated water is necessary to
A.	remove residual turbidity.
B.	reduce the bacterial load on filter.
C.	control taste and odour.
D.	remove chlorinous taste.
Answer» E.

Discussion

3435.	Fire clay is __________ refractory material.
A.	a basic
B.	an acidic
C.	a neutral
D.	not a
Answer» C. a neutral

Discussion

3436.	An oil is converted into fat by its
A.	hydrogenation
B.	hydrolysis
C.	hydrocracking
D.	hydration
Answer» B. hydrolysis

Discussion

3437.	Production of one ton of cement requires about __________ tons of limestone.
A.	0.6
B.	1.2
C.	2.2
D.	3.8
Answer» C. 2.2

Discussion

3438.	Bio-degradable detergents
A.	can be readily oxidised.
B.	pose problem in sewerage plant.
C.	have an isoparaffinic structure.
D.	should not be used as it spoils the cloth.
Answer» B. pose problem in sewerage plant.

Discussion

3439.	Sea water contains about __________ ppm of bromine.
A.	5
B.	70
C.	500
D.	1700
Answer» C. 500

Discussion

3440.	Which allotrope of sulphur is insoluble in carbon disulphide ?
A.	Rhombic sulphur
B.	Monoclinic sulphur
C.	Plastic sulphur
D.	Milk of sulphur
Answer» D. Milk of sulphur

Discussion

3441.	Flexible foam (for mattresses) is usually made of
A.	PVC
B.	silicone
C.	polyurethanes
D.	polyamides
Answer» D. polyamides

Discussion

3442.	Glycerine is a by-product of the __________ industry.
A.	soap
B.	detergent
C.	oil hydrogenation
D.	paint
Answer» B. detergent

Discussion

3443.	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
A.	adjust the pH of the syrup.
B.	remove the coloring matter from the syrup.
C.	reduce the viscosity of the syrup.
D.	improve the rate of crystallisation of sugar.
Answer» B. remove the coloring matter from the syrup.

Discussion

3444.	Hydrogenation of oil does not
A.	remove double bonds.
B.	raise its melting point.
C.	improve its resistance to oxidation.
D.	none of these.
Answer» E.

Discussion

3445.	Main constituents of cotton fiber is
A.	lignin
B.	cellulose
C.	starch
D.	gelatine
Answer» C. starch

Discussion

3446.	CaCl(OCl) is the chemical formula of
A.	hypo
B.	bleaching powder
C.	plaster of paris
D.	aqua regia
Answer» C. plaster of paris

Discussion

3447.	Which of the following is an ore of iron ?
A.	Galena
B.	Chalcopyrite
C.	Hematite
D.	Bauxite
Answer» D. Bauxite

Discussion

3448.	Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process ?
A.	NH
B.	<sub>3</sub>
C.	NaCl
D.	CaO
E.	Coke
Answer» B. <sub>3</sub>

Discussion

3449.	Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.
A.	coke and sand
B.	brine and coal
C.	coke and caustic soda
D.	none of these
Answer» C. coke and caustic soda

Discussion

3450.	Diaphragm electrolytic cell as compared to mercury electrolytic cell
A.	produces 70% NaOH solution.
B.	requires less specific power consumption for the production of chlorine.
C.	requires lesser investment for similar capacity.
D.	all (a), (b) and (c).
Answer» D. all (a), (b) and (c).

Discussion

Explore topic-wise MCQs in Engineering.

The compressive strength of cement should not be less than about 110Kg/cm2 after three days &amp; not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm2/gm.

Commercial production of calcium carbide requires limestone and __________ as raw materials.

Which one of the following is not likely to be a constituent of vegetable oils ?

Nitroglycerene absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as a controlled explosive called dynamite. The raw material used for its manufacture are glycerene, nitric acid and

The process involved in converting rubber into a thin sheet or coating it on fabric is called

Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.

Molasses is the starting material for the production of

BHC (Benzene hexachloride) is made by the chlorination of benzene

Fish contains about __________ percent oil.

The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to

Polymethyl methacrylate (PMMA) is known as

Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.

Percentage of alcohol in beer may be around __________ percent.

Which is the most suitable dye for synthetic fibres ?

Hydrolysis of sugar is called

Sulphuric acid completely saturated with sulphur trioxide is called

__________ is used as a flux in the smelting of copper ore like chalcopyrite.

Phenol formaldehyde is produced by condensation polymerisation. It is also known as

Penicillin is separated from fermented broth by

__________ process is used for producing soda ash.

Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on

Which of the following is an unsaturated fatty acid ?

The yield of tar from high temperature carbonisation of dry coal is about __________ percent.

The most widely used coagulant for removing suspended impurities from water is

__________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.

Phthalic anhydride is used

Lubricating greases are a mixture of

Metallic soap is __________ salt of fatty acids.

Bitterns is a/an

Chalcopyrite is the main ore of

Low temperature carbonisation of coal takes place at __________ C.

Shaving soaps are

Extraction of __________ employs an electrolytic process.

Dechlorination of treated water is necessary to

Fire clay is __________ refractory material.

An oil is converted into fat by its

Production of one ton of cement requires about __________ tons of limestone.

Bio-degradable detergents

Sea water contains about __________ ppm of bromine.

Which allotrope of sulphur is insoluble in carbon disulphide ?

Flexible foam (for mattresses) is usually made of

Glycerine is a by-product of the __________ industry.

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

Hydrogenation of oil does not

Main constituents of cotton fiber is

CaCl(OCl) is the chemical formula of

Which of the following is an ore of iron ?

Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process ?

Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.

Diaphragm electrolytic cell as compared to mercury electrolytic cell

The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm2/gm.