Top 50 Chemical Engineering MCQ Questions and Answers Pdf

Top 50 Chemical Engineering MCQ Questions and Answers Pdf

Mar 28, 2024, By Meritnotes

Question 1 :

_____ is obtained as a by-product in the manufacturer of sodium hydroxide using brine.

(a) Ammonium chloride

(b) Chlorine

(c) Sodium carbonate

(d) Sodium bicarbonate

Answer: B

Chlorine

Question 2 :

Which of the following is the oldest commercial manmade fibre?

(a) Viscose rayon

(b) Cotton

(c) Terylene

(d) Nylon

Answer: A

Viscose rayon

Question 3 :

Zeigler process

(a) Employs very high pressure

(b) Produces low density polythene

(c) Uses no catalyst

(d) Produces high density polythene

Answer: D

Produces high density polythene

Question 4 :

_____ is a homopolymer.

(a) Bakelite

(b) Nylon 66

(c) Terylene

(d) Neoprene

Answer: D

Neoprene

Question 5 :

Which of the following is a copolymer?

(a) PVC

(b) Bakelite

(c) Teflon

(d) Polythene

Answer: B

Bakelite

Question 6 :

Flexible plastic pipes are made of

(a) Polypropylene

(b) Plaster moulding process

(c) High Density Polyethylene (HDPE)

(d) Low Density Polyethylene (LDPE)

Answer: C

High Density Polyethylene (HDPE)

Question 7 :

First law of thermodynamics deals with the

(a) Reversible processes only

(b) Irreversible processes only

(c) Direction of energy transfer

(d) None of these

Answer: C

Direction of energy transfer

Question 8 :

Second law of thermodynamics is concerned with the

(a) Non cyclic processes only

(b) Irreversible processes only

(c) Direction of energy transfer

(d) Amount of energy transferred

Answer: C

Direction of energy transfer

Question 9 :

The most important application of distribution law is in

(a) Distillation

(b) Drying

(c) Liquid extraction

(d) Evaporation

Answer: C

Liquid extraction

Question 10 :

For a system in equilibrium, at a given temperature and pressure, the

(a) Gibb's free energy must be minimum

(b) Internal energy must be a minimum

(c) Entropy must be a minimum

(d) Enthalpy must be in minimum

Answer: A

Gibb's free energy must be minimum

Question 11 :

Which of the following natural bio polymers are formed as a result of polymerisation of amino acids?

(a) Cellulose

(b) Proteins

(c) Nucleic acids

(d) Starch

Answer: B

Proteins

Question 12 :

Which of the following has the highest flash point of all?

(a) Furnace oil

(b) Petrol

(c) Kerosene

(d) Diesel

Answer: A

Furnace oil

Question 13 :

Phenols are added in gasoline to

(a) Act as an antioxidant

(b) Reduce its viscosity

(c) Increase its pour point

(d) Improve the octane number

Answer: B

Reduce its viscosity

Question 14 :

As the product size from a ball mill decreases, the

(a) Capacity decreases, but the power requirement increases

(b) Capacity and power requirement of the mill decreases

(c) Capacity increases, but the power requirement decreases

(d) Capacity and power requirement of the mill increases

Answer: A

Capacity decreases, but the power requirement increases

Question 15 :

Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?

(a) Ball mill

(b) Rod mill

(c) Fluid energy mill

(d) Gyratory crusher

Answer: D

Gyratory crusher

Question 16 :

Copper base alloys are resistant to

(a) Aqueous ammonia solutions

(b) Chromic acid of any concentration

(c) Most alkaline solutions at room temperature

(d) Nitric acid of any concentration

Answer: C

Most alkaline solutions at room temperature

Question 17 :

Henry's law states that the

(a) Partial pressure is equal to the product of the mole fraction and total pressure

(b) Vapour pressure is equal to the product of the mole fraction and total pressure

(c) Partial pressure of a component over a solution is proportional to the mole fraction in the vapour

(d) Partial pressure of a compound over a solution is proportional to its mole fraction in the liquid

Answer: D

Partial pressure of a compound over a solution is proportional to its mole fraction in the liquid

Question 18 :

Molecular diffusivity of a liquid

(a) May increase or decrease with temperature

(b) Is independent of temperature

(c) Increases with temperature

(d) Decreases with temperature

Answer: A

May increase or decrease with temperature

Question 19 :

____ flow is indicated by the value of Mach number equal to unity.

(a) Sub sonic

(b) Super sonic

(c) Sonic

(d) Turbulent

Answer: C

Sonic

Question 20 :

The magnus effect is defined as the

(a) Generation of lift on a rotating cylinder in a uniform flow

(b) Separation of boundary layer near the trailing edge of a slender body

(c) Circulation induced in an aircraft wing

(d) Generation of lift per unit drag force

Answer: A

Generation of lift on a rotating cylinder in a uniform flow

Question 21 :

Naphtha in a fertilizer plant is used as a source of

(a) Fuel

(b) O₂

(c) N₂

(d) H₂

Answer: D

H₂

Question 22 :

Catalyst used in the oxidation of ammonia is

(a) Platinum – molybdenum

(b) Cobalt – molybdenum

(c) Platinum – rhodium

(d) Platinum – beryllium

Answer: C

Platinum – rhodium

Question 23 :

Action of phosphoric acid on rock phosphate produces

(a) Diammonium phosphate

(b) Nitrophosphate

(c) Triple superphosphate

(d) Superphosphate

Answer: C

Triple superphosphate

Question 24 :

Which one is true for a throttling process?

(a) The inversion temperature is the temperature at which Joule Thomson Co-efficient is infinity

(b) The inversion temperature is same for all gases

(c) A gas may have more than one inversion temperature

(d) The inversion temperature is different for different gases

Answer: D

The inversion temperature is different for different gases

Question 25 :

In an ideal gas mixture, the fugacity of a component in the mixture is equal to

(a) Partial pressure

(b) Chemical potential

(c) Total pressure

(d) Mole fraction

Answer: A

Partial pressure

Question 26 :

The synthetic fibres produced from _____ are known as rayon.

(a)Ethylene glycol

(b) Polyamides

(c) Cellulose

(d) Lignin

Answer: C

Cellulose

Question 27 :

In a constant pressure filtration

(a) Rate of filtration decreases with time

(b) Rate of filtration increases with time

(c) Rate of filtration is constant

(d) Resistance decreases with time

Answer: A

Rate of filtration decreases with time

Question 28 :

Fluid flow at increasing rate through a diverging pipe is an example of _____ flow.

(a) Steady non uniform

(b) Non steady non uniform

(c) Steady uniform

(d) Non steady uniform

Answer: B

Non steady non uniform

Question 29 :

During agitation of liquids, power consumption during laminar flow is not proportional to the

(a) Square of rotational speed

(b) Cube of impeller diameters

(c) Viscosity of the liquid

(d) Density of the liquid

Answer: D

Density of the liquid

Question 30 :

Which of the following fertilizers contains the least percentage of nitrogen?

(a) Ammonium phosphate

(b) Ammonium sulphate

(c) Liquid ammonia

(d) Urea

Answer: A

Ammonium phosphate

Question 31 :

Earth is protected from harmful effects of ultraviolet radiations by

(a) Carbon dioxide layer

(b) Oxygen layer

(c) Troposphere

(d) Ozone layer

Answer: D

Ozone layer

Question 32 :

The rate constant of a reaction depends on the

(a) Temperature of the system

(b) Extent of reaction

(c) Time of reaction

(d) Initial concentration of reactants

Answer: A

Temperature of the system

Question 33 :

Which of the following is an important reinforcing agent for various elastomers?

(a) Carbon black

(b) Sodium silicate

(c) Barium carbonate

(d) Sodium sulfate

Answer: A

Carbon black

Question 34 :

_____ steel has almost zero temperature coefficient of thermal expansion.

(a) Invar

(b) Platinum

(c) Cobalt

(d) Stainless

Answer: A

Invar

Question 35 :

Which of the following exercises most powerful influence on the mechanical properties of steel?

(a) Monel

(b) Mild steel

(c) Cast iron

(d) Stainless steel

Answer: C

Cast iron

Question 36 :

______ is used as a flux in the extraction of iron from iron ore (hematite) in blast furnace.

(a) Manganese

(b)Quartz

(c) Limestone

(d) Bauxite

Answer: C

Limestone

Question 37 :

_____ are used as corrosion inhibitor for iron and steel in aqueous solutions.

(a) Bi-carbonates

(b) Sulphates

(c) Chromates

(d) Phosphate

Answer: C

Chromates

Question 38 :

_____ paper is used in the manufacture of newsprint paper.

(a) Wrapping

(b) Tissue

(c) Board

(d) Groundwood

Answer: D

Groundwood

Question 39 :

Main constituent of limestone is

(a) CaSO₄

(b) Na₂CO₃

(c) MgCO₃

(d) CaCO₃

Answer: D

CaCO₃

Question 40 :

Temperature and pressure in ammonia converter is

(a) 200 atm, 1000°C

(b) 450 atm, 200°C

(c) 450 atm, 550°C

(d) 450 atm, 1000°C

Answer: C

450 atm, 550°C

Question 41 :

Sodium Tri Poly Phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium

(a) Bicarbonate

(b) Carbonate

(c) Phosphate

(d) Silicate

Answer: B

Carbonate

Question 42 :

Electric process as compared to wet process (for the manufacture of phosphoric acid)

(a) Is weak acid process

(b) Produce a valuable by product called gypsum

(c) Is used less frequently

(d) Can use only high grade phosphate rock

Answer: C

Is used less frequently

Question 43 :

Bulk diffusion catalyst pore _____ with increase in pressure.

(a) Increases

(b) Decreases

(c) Increases exponentially

(d) Remains unchanged

Answer: B

Decreases

Question 44 :

Which of the following is the most elastic material?

(a) Rubber

(b) Steel

(c) Glass

(d) Plastic

Answer: B

Steel

Question 45 :

Beehive coke ovens are made of _____ bricks.

(a) Corundum

(b) Silicon carbide

(c) Fireclay

(d)Silica

Answer: D

Silica

Question 46 :

Stainless steel contains

(a) Aluminium

(b) Catalytic cracking

(c) Copper

(d) Chromium and nickel

Answer: D

Chromium and nickel

Question 47 :

Photochemical reactions occur in the presence of

(a) Monochromatic radiation only

(b) Solid catalysts

(c) Darkness

(d) Sunlight

Answer: D

Sunlight

Question 48 :

A mixture of phosphate rock _____ is heated in an electric furnace to produce phosphorous.

(a) Sand and coke

(b) Salt and coke

(c) And coke

(d) And sand

Answer: A

Sand and coke

Question 49 :

Out of the following, N₂ content is minimum in

(a) Ammonium chloride

(b) Ammonium sulphate

(c) Ammonium nitrate

(d) Urea

Answer: D

Urea

Question 50 :

Dehydration of ammonium carbamate to yield urea is a/an _____ reaction.

(a) Catalytic

(b) Autocatalytic

(c) Endothermic

(d) Exothermic

Answer: C

Endothermic