Engineering Materials

Q1: Iron ore is, usually, found in the form of

A oxides

B carbonates

C sulphides

D all of these

Q2: Tungsten when added to steel __________ the critical temperature.

A does not effect

B lowers

C raises

Q3: Closed packed hexagonal space lattice is found in

A zinc, magnesium, cobalt, cadmium, antimony and bismuth

B gamma-iron, aluminium, copper, lead, silver and nickel

C alpha-iron, tungsten, chromium and molybdenum

D none of the above

Q4: The hardness of steel increases if it contains

A pearlite

B ferrite

C cementite

D martensite

Q5: White cast iron has a high tensile strength and a low compressive strength.

A Yes

B No

Q6: An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

A chromium

B silicon

C manganese

D magnesium

Q7: Cast iron is manufactured in

A blast furnace

B cupola

C open hearth furnace

D bessemer converter

Q8: Smelting is the process of

A removing the impurities like clay, sand etc. from the iron ore by washing with water

B expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns

C reducing the ore with carbon in the presence of a flux

D all of the above

Q9: Thermoplastic materials are those materials which

A are formed into shape under heat and pressure and results in a permanently hard product

B do not become hard with the application of heat and pressure and no chemical change occurs

C are flexible and can withstand considerable wear under suitable conditions

D are used as a friction lining for clutches and brakes

Q10: A small percentage of boron is added to steel in order to

A increase hardenability

B reduce machinability

C increase wear resistance

D increase endurance strength

Q11: An eutectoid steel consists of

A wholly pearlite

B wholly austenite

C pearlite and ferrite

D pearlite and cementite

Q12: The electric process of steel making is especially adopted to

A alloy and carbon tool steel

B magnet steel

C high speed tool steel

D all of these

Q13: Free carbon in iron makes the metal

A soft and gives a coarse grained crystalline structure

B soft and gives a fine grained crystalline structure

C hard and gives a coarse grained crystalline structure

D hard and gives a fine grained crystalline structure

Q14: The ability of a material to absorb energy in the plastic range is called

A resilience

B creep

C fatigue strength

D toughness

Q15: Cast iron is a

A ductile material

B malleable material

C brittle material

D tough material

Q16: Brass is an alloy of

A copper and zinc

B copper and tin

C copper, tin and zinc

D none of these

Q17: The cupola is used to manufacture

A pig iron

B cast iron

C wrought iron

D steel

Q18: Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

A eutectic cast irons

B hypo-eutectic cast irons

C hyper-eutectic cast irons

D none of these

Q19: When the steel is normalised, its

A yield point increases

B ductility decreases

C ultimate tensile strength increases

D all of these

Q20: The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese.

A Yes

B No

Q21: The hardness is the property of a material due to which it

A can be drawn into wires

B breaks with little permanent distortion

C can cut another metal

D can be rolled or hammered into thin sheets

Q22: Silicon when added to copper improves

A machinability

B hardness

C hardness and strength

D strength and ductility

Q23: In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled

A in still air

B slowly in the furnace

C suddenly in a suitable cooling medium

D any one of these

Q24: Nimonic contains __________ percentage of nickel as that of Inconel.

A same

B less

C more

Q25: Shock resisting steels should have

A low wear resistance

B low hardness

C low tensile strength

D toughness

Q26: Which of the following has a fine gold colour and is used for imitation jewellery?

A Silicon bronze

B Aluminium bronze

C Gun metal

D Babbit metal

Q27: Specify the sequence correctly

A Grain growth, recrystallisation, stress relief

B Stress relief, grain growth, recrystallisation

C Stress relief, recrystallisation, grain growth

D Grain growth, stress relief, recrystallisation

Q28: The unit cells

A contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal

B have the same orientation and their similar faces are parallel

C may be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice

D all of the above

Q29: Which of the following material has maximum ductility?

A Mild steel

B Copper

C Nickel

D Aluminium

Q30: Malleable cast iron is produced

A by adding magnesium to molten cast iron

B by quick cooling of molten cast iron

C from white cast iron by annealing process

D none of these

Q31: The coke in the charge of blast furnace

A controls the grade of pig iron

B acts as an iron-bearing mineral

C supplies heat to reduce ore and melt the iron

D forms a slag by combining with impurities

Q32: Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur?

A Bessemer process

B Open hearth process

C Duplex process

D Electric process

Q33: A material is said to be allotropic, if it has

A fixed structure at all temperatures

B atoms distributed in random pattern

C different crystal structures at different temperatures

D any one of the above

Q34: The material in which the atoms are arranged regularly in some directions but not in others, is called

A amorphous material

B mesomorphous material

C crystalline material

D none of these

Q35: The lower critical temperature

A decreases as the carbon content in steel increases

B increases as the carbon content in steel increases

C is same for all steels

D depends upon the rate of heating

Q36: The type of space lattice found in gamma-iron is

A face centred cubic space lattice

B body centred cubic space lattice

C close packed hexagonal space lattice

D none of these

Q37: The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

A chromium

B nickel

C vanadium

D cobalt

Q38: Crystal structure of a material is, generally, examined by

A naked eye

B optical microscope

C metallurgical microscope

D X-ray techniques

Q39: Nodular cast iron is produced by adding __________ to the molten cast iron.

A nickel

B chromium

C copper

D magnesium

Q40: The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.

A superior

B inferior

Q41: Ferrite and pearlite makes the steel soft and ductile.

A Agree

B Disagree

Q42: Haematite iron ore contains iron about

A 30%

B 45%

C 55%

D 70%

Q43: The quenching of steel from the upper critical point results in a fine grained structure.

A Agree

B Disagree

Q44: The property of a material due to which it breaks with little permanent distortion, is called

A brittleness

B ductility

C malleability

D plasticity

Q45: The charge is fed into the blast furnace through the

A stack

B throat

C bosh

D tuyers

Q46: Dye penetrant method is generally used to locate

A core defects

B surface defects

C superficial defects

D temporary defects

Q47: The heat treatment process used for softening hardened steel is

A carburising

B normalising

C annealing

D tempering

Q48: The hardness and tensile strength in austenitic stainless steel can be increased by

A hardening and cold working

B normalising

C martempering

D full annealing

Q49: The percentage of carbon in cast iron varies from

A 0.1 to 0.5

B 0.5 to 1

C 1 to 1.7

D 1.7 to 4.5

Q50: The lower critical point for all steels is

A 600°C

B 700°C

C 723°C

D 913°C

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