Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

Lead is used as a sheathing material on cables.(a) True(b) FalseI got this question in examination.This question is from Lead topic in section Metallurgical Industries of Chemical Technology

Answer» CORRECT option is (a) True

Best explanation: LEAD is used as a sheathing material on CABLES to prevent ingress of MOISTURE. It is an important strategic material.
Discussion
2.

How is crystallization of trihydrate induced while manufacturing aluminium?(a) Mixing(b) Cooling(c) Heating(d) AgitationI got this question during an interview.The above asked question is from Aluminum in portion Metallurgical Industries of Chemical Technology

Answer»

The CORRECT option is (b) Cooling

The BEST explanation: The slurry is washed in a SERIES of counter current THICKENERS. The sodium aluminate is clarified via a rotary filter. The diluted mixture is cooled and seeded in a precipitator to INDUCE crystallization of trihydrate.
Discussion
3.

What is the temperature of the blast furnace in steel plants?(a) 100°C(b) 1000°C(c) 500°C(d) 2200°CThe question was asked by my college director while I was bunking the class.My question comes from Steel in division Metallurgical Industries of Chemical Technology

Answer»

Right OPTION is (d) 2200°C

For explanation I would SAY: BLAST furnace is used to break down the PIG iron at high temperature condition. The maximum temperature of the blast furnace is around 2200°C
Discussion
4.

Which among the following is an essential chemical reaction for the manufacture of pig iron?(a) Fe2O3 + 3C → 2Fe + 3CO(b) FeS + C → Fe + CS(c) Fe3O4 + S → 3Fe + SO4(d) Fe2O3 + S → 2Fe + SO3This question was posed to me by my college director while I was bunking the class.Question is taken from Iron topic in division Metallurgical Industries of Chemical Technology

Answer» CORRECT answer is (a) Fe2O3 + 3C → 2Fe + 3CO

The BEST I can explain: Coke is REACTED with hematite at a high TEMPERATURE through a furnace. As air reacts with coke CO and heat is generated as iron oxide is REDUCED, molten iron gathers at the base of the furnace.
Discussion
5.

How is alumina converted to aluminium?(a) Heating(b) Cooling(c) Electrolytically using an aluminium smelting cell(d) Adding cokeThis question was posed to me in quiz.This question is from Aluminum topic in chapter Metallurgical Industries of Chemical Technology

Answer»

Right answer is (c) Electrolytically using an aluminium SMELTING cell

Best explanation: Alumina is periodically reduced to aluminium by electrolysis. A MOLTEN CRYOLITE bath is maintained at 1000°C. Reduction takes PLACE at the GRAPHITE anodes.
Discussion
6.

Which among the following is a major source of aluminium oxide?(a) Hematite(b) Siderite(c) Magnetite(d) BauxiteI have been asked this question in my homework.My question is taken from Aluminum in section Metallurgical Industries of Chemical Technology

Answer» RIGHT answer is (d) Bauxite

For explanation: The major source of aluminium oxide USED in ELECTROLYTIC reduction cells is bauxite. Bauxite CONSISTS of 50-60% of alumina, silica and ore. Hematite, siderite and MAGNETITE are ores of iron.
Discussion
7.

Which among the following is an ore of copper?(a) Hematite(b) Magnetite(c) Chalcopyrite(d) SideriteThe question was asked at a job interview.My question is taken from Copper topic in chapter Metallurgical Industries of Chemical Technology

Answer» RIGHT answer is (c) Chalcopyrite

Explanation: The PREDOMINANT ORE of COPPER is chalcopyrite (CuFeS2). Hematite, magnetite and siderite are ores of iron.
Discussion
8.

Coke consumption can be reduced in the manufacture of pig iron.(a) False(b) TrueThis question was addressed to me in unit test.The query is from Iron topic in section Metallurgical Industries of Chemical Technology

Answer»

The CORRECT option is (b) True

The explanation is: COKE consumption can be reduced in the manufacture of pig iron by using supplementary oil INJECTION. Up to 20% savings can be made.
Discussion
9.

Which is the third most extensively used non-ferrous metal?(a) Lead(b) Copper(c) Zinc(d) AluminiumThis question was posed to me in semester exam.This is a very interesting question from Zinc topic in section Metallurgical Industries of Chemical Technology

Answer»

The CORRECT option is (c) Zinc

Easy EXPLANATION: Zinc is the third most extensively used nonferrous METAL next to ALUMINIUM and copper. Zinc TENDS to lose its identity in the product.
Discussion
10.

Recovery of alumina from red mud is the most difficult process during the manufacture of aluminium.(a) True(b) FalseThis question was addressed to me during a job interview.The origin of the question is Aluminum topic in section Metallurgical Industries of Chemical Technology

Answer»

Right choice is (a) True

For explanation I would say: Recovery of alumina from RED MUD discharged from the thickener is the major engineering problem in the MANUFACTURE of aluminium. Alternative method is to calcine the mud with lime and soda ash to form SODIUM aluminate which can be leached.
Discussion
11.

What is the pressure maintained in the autoclave while manufacturing steel?(a) 1atm(b) 2atm(c) 0.5atm(d) 4.5atmI have been asked this question during an internship interview.The above asked question is from Aluminum topic in portion Metallurgical Industries of Chemical Technology

Answer»

Right ANSWER is (d) 4.5atm

The explanation: BAUXITE ore if FED to jaw crusher. Then the ore is mixed with concentrated caustic in an autoclave digester at 4.5atms. High pressure is maintained for 100% conversion to SODIUM ALUMINATE.
Discussion
12.

Which method is commonly used for the manufacture of steel?(a) Open hearth process(b) Contact process(c) Kraft’s process(d) Monte catini processThis question was posed to me in examination.Asked question is from Steel in portion Metallurgical Industries of Chemical Technology

Answer» RIGHT option is (a) Open hearth PROCESS

Best explanation: In open hearth process TONS of molten pig iron, steel and iron ore is charged. The limestone reacts with phosphorous. The iron ore furnishes oxygen.
Discussion
13.

Removal of impurities from pig iron by oxidation gives steel.(a) True(b) FalseI got this question in an interview for internship.My doubt stems from Steel topic in division Metallurgical Industries of Chemical Technology

Answer»

The correct ANSWER is (a) True

Explanation: STEEL making involves the removal of undesirable elements from pig iron by oxidation FOLLOWED by the addition of the necessary ingredients to make the type of steel REQUIRED.
Discussion
14.

What is electro galvanizing?(a) Copper plating(b) Zinc plating(c) Aluminium plating(d) Lead platingThis question was addressed to me by my school principal while I was bunking the class.Question is taken from Zinc in division Metallurgical Industries of Chemical Technology

Answer»

The correct choice is (b) Zinc PLATING

Best explanation: Electro galvanizing is the NAME GIVEN to zinc plating when APPLIED continuously to steel. Copper plating is the plating copper on an item electrolytically.
Discussion
15.

What are the raw materials needed for the manufacture of pig iron?(a) Iron ore-Calcium-Coke(b) Iron ore-Coke(c) Iron ore-Calcium(d) Iron ore-Coke-LimestoneI got this question by my school principal while I was bunking the class.My question is taken from Iron in portion Metallurgical Industries of Chemical Technology

Answer»

Right choice is (d) Iron ORE-COKE-Limestone

Best explanation: Coke and limestone are introduced by conveyors onto a furnace which is REACTED with the iron ore along with a HOT air blast at a TEMPERATURE of 600-800°C.
Discussion
16.

How is carbon electrodes formed in an electrolytic aluminium smelting cell?(a) From Alumina(b) By Replacing the old electrodes(c) From coke and carbon dioxide(d) From coke and pitchI got this question in examination.Question is taken from Aluminum topic in division Metallurgical Industries of Chemical Technology

Answer»

The CORRECT choice is (d) From coke and PITCH

To explain: CARBON electrodes are formed continuously from coke and pitch. Pitch is a soft to hard and BRITTLE coal SUBSTANCE.
Discussion
17.

How can the production of pig iron be increased?(a) Increasing temperature decreasing pressure(b) Decreasing temperature(c) Increasing pressure(d) Decreasing pressureI got this question in exam.Query is from Iron in division Metallurgical Industries of Chemical Technology

Answer» RIGHT choice is (c) Increasing pressure

Explanation: Increased production of pig iron can be ACHIEVED by increasing the pressure CONDITIONS. This REDUCES dust carry over and allows HIGHER production rates.
Discussion
18.

Why is lead used in ceramic industry?(a) To increase strength(b) To increase water resistance(c) To increase lustre(d) To increase electrical conductivityI had been asked this question in unit test.This is a very interesting question from Lead in chapter Metallurgical Industries of Chemical Technology

Answer»

The correct option is (c) To INCREASE lustre

To explain I WOULD say: Lead compounds impart low surface TENSION and low viscosity over a wide TEMPERATURE range which results in smoothness and ADDS lustre.
Discussion
19.

Which among the following impurity is not added to steel?(a) Silicon(b) Carbon(c) Manganese(d) ArsenicThis question was posed to me during a job interview.The question is from Steel topic in section Metallurgical Industries of Chemical Technology

Answer» CORRECT answer is (d) Arsenic

For explanation: Sulphur is added in STEEL to improve its machineability but LOWERS the ductility. Carbon increases the strength of steel WHEREAS manganese increases the HARDENABILITY.
Discussion
20.

What are the raw materials needed for the manufacture of steel?(a) Pig iron(b) Nickel + oxygen(c) Pig iron + oxygen(d) Pig iron + nitrogenI got this question in semester exam.This key question is from Steel in portion Metallurgical Industries of Chemical Technology

Answer»

The CORRECT OPTION is (c) Pig IRON + oxygen

The EXPLANATION is: Steel can be manufactured from pig iron with air or oxygen. Pig iron is manufactured from iron ore, coke and limestone.
Discussion
21.

Which among the following is not an iron ore?(a) Hematite(b) Magnetite(c) Siderite(d) PyrrhotiteThis question was addressed to me in exam.Query is from Iron in portion Metallurgical Industries of Chemical Technology

Answer»

The CORRECT option is (d) PYRRHOTITE

Best explanation: Pyrrhotite is an ore of Ni WHEREAS hematite (Fe2O3), MAGNETITE (Fe3O4) and siderite (FeCO3) are the ores of Iron.
Discussion
22.

What are the steps involved in purifying copper? (In order of precedence)(a) Smelting-Roasting-Converting(b) Smelting-Converting-Roasting(c) Converting-Roasting-Smelting(d) Roasting-Smelting-ConvertingThe question was asked in an interview for job.Origin of the question is Copper topic in section Metallurgical Industries of Chemical Technology

Answer»

Correct answer is (d) Roasting-Smelting-Converting

Explanation: Water is FIRST removed by roasting. Steamed air is sent in to REMOVE the volatile IMPURITIES. The final is conversion of MATTE.
Discussion
23.

Which method is used to extract copper from sulphide ores?(a) Froth floatation(b) Leaching(c) Screening(d) Mechanical agitationI have been asked this question in an interview for job.Origin of the question is Copper in portion Metallurgical Industries of Chemical Technology

Answer»

The correct ANSWER is (a) Froth floatation

Easiest explanation: In froth floatation process, the ore is added to water and other reagents and is mechanically agitated forming BUBBLES. As the BUBBLE RISES it CARRIES the copper along.
Discussion