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Engineering Materials
2

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

1. Y-alloy contains

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

5 to 6% tin, 2 to 3% copper and rest aluminium

2.

Blast furnace produces following by reduction of iron ore

Pig iron

Wrought iron

Cast iron

Malleable iron

3. Which of the following impurity in cast iron makes it hard and brittle?

Silicon

Manganese

Phosphorus

Sulphur

4. In a hardening process, the hypo-eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

Heated below or closes to the lower critical temperature and then cooled slowly

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

5. The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C above upper critical temperature

30° C to 50° C above lower critical temperature

30° C to 50° C below upper critical temperature

30° C to 50° C below lower critical temperature

6. The charge of the blast furnace consists of

Calcined ore, coke and limestone all in equal parts

Calcined ore (4 parts), coke (1 part) and limestone (8 parts)

Calcined ore (1 part), coke (8 parts) and limestone (4 parts)

Calcined ore (8 parts), coke (4 parts) and limestone (1 part)

7. Nickel in steel

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

8. Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

Equal to

More than

None of these

Less than

9. For a steel containing 0.8% carbon

There is no critical point

There are two critical points

There can be any number of critical points

There is only one critical point

10. Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities

80% or more iron

50% or more iron

Alloying elements like chromium, tungsten nickel and copper

Page 2 of 4

11. In process annealing, the hypo eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

Heated below or closes to the lower critical temperature and then cooled slowly

12. The correct composition of Babbitt metal is

82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

87% Sn, 4% Cu, 8% Sb, 1% Al

13. When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

Pearlite and cementite

Mainly ferrite

Ferrite and pearlite

Mainly pearlite

14. Which of the following has highest specific strength of all structural materials?

Magnesium alloys

Magnetic steel alloys

Chromium alloys

Titanium alloys

15. In spheroidising process, the steel is

None of the above

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

Heated below the lower critical temperature and then cooled slowly

Heated up to the lower critical temperature and then cooled in still air

16. A coarse grained steel

Is less tough and has a greater tendency to distort during heat treatment

Is more ductile and has a less tendency to distort during heat treatment

Is more ductile and has a greater tendency to distort during heat treatment

Is less tough and has a less tendency to distort during heat treatment

17. Cemented carbide tools are not found to be suitable for cutting

Cast iron

Aluminium

Steel

Brass

18. Heavy duty leaf and coil springs contain carbon of the following order

0.5%

0.2%

1.0%

0.8%

19. Pick up the wrong statement

Aluminium in steel results in excessive grain growth

Manganese in steel induces hardness

Nickel and chromium in steel helps in raising the elastic limit and improve the resilience and ductility

Tungsten in steels improves magnetic properties and hardenability

20. The percentage carbon content in wrought iron is about

0.1

0.2

0.4

0.02

Page 3 of 4

21. According to Indian standard specifications, SG 400/15 means

Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area

Spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation

None of the above

Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa

22. Bell metal contains

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

70 - 75% copper and rest tin

90% copper and 10% tin

23. Pipes for bicycle frames are made of

Forged steel

Cast steel

Cold rolled steel

Hot rolled steel

24. When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

Less than

None of these

Equal to

More than

25. Pick up the wrong statement Nickel and chromium in steel help in

Providing high strength at elevated temperatures

Raising the elastic limit

Providing corrosion resistance

Improving machining properties

26. The silicon steel is widely used for

Generators and transformers in the form of laminated cores

Cutting tools

Connecting rods

Motor car crankshafts

27. Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element

Copper

Nickel

Aluminium

Iron

28. The composition of silver solder is

Silver, copper, aluminium

Silver, lead, zinc

Silver, copper, zinc

Silver, tin, nickel

29. Dow metal contains

90% aluminium and 90% copper

92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

90% magnesium and 9% aluminium with some copper

30. Normalising of steel is done to

Refine the grain structure

Remove strains caused by cold working

All of the above

Remove dislocations caused in the internal structure due to hot working

Page 4 of 4

31. Tensile strength of steel can be safely increased by

Adding small quantities of copper

Adding carbon up to 2.8%

Adding carbon up to 0.83%

Adding carbon up to 6.3%

32. Body centered cubic space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha iron, tungsten, chromium and molybdenum

None of the above

Gamma iron, aluminium, copper, lead, silver and nickel

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

Aluminium bronze

Babbitt metal

Gun metal

Silicon bronze

34. Which one of the following metals would work-harden more quickly than the others?

Silver

Lead

Copper

Brass

35. Which of the following statement is wrong?

Steel with 0.8% carbon is wholly pearlite

The cementite is identified as round particles in the structure

A mechanical mixture of 87% cementite and 13% ferrite is called pearlite

The amount of cementite increases with the increase in percentage of carbon in iron

36. Amorphous material is one

Which is not attacked by phosphorous

In which atoms align themselves in a geometric pattern upon solidification

In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

Which emits fumes on melting

37. The following element can't impart high strength at elevated temperature

Magnesium

Silicon

Nickel

Manganese

38. Which of the following metal is used for nuclear energy?

Thorium

Uranium

Niobium

All of these

39. Brass (alloy of copper and zinc) is an example of

Interstitial solid solution

Intermetallic compounds

All of the above

Substitutional solid solution

40. Which of the following alloys does not have copper as one of the constituents?

Monel metal

Delta metal

Constantan

Nichrome

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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