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Engineering Materials
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Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

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

Less than

None of these

More than

Equal to

2. Amorphous material is one

Which is not attacked by phosphorous

Which emits fumes on melting

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

In which atoms align themselves in a geometric pattern upon solidification

3. The charge of the blast furnace consists of

Calcined ore, coke and limestone all in equal parts

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

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

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

4. Pick up the wrong statement

Manganese in steel induces hardness

Aluminium in steel results in excessive grain growth

Tungsten in steels improves magnetic properties and hardenability

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

5. For a steel containing 0.8% carbon

There is only one critical point

There is no critical point

There can be any number of critical points

There are two critical points

6. The composition of silver solder is

Silver, copper, aluminium

Silver, copper, zinc

Silver, tin, nickel

Silver, lead, zinc

7. Normalising of steel is done to

Remove dislocations caused in the internal structure due to hot working

Refine the grain structure

All of the above

Remove strains caused by cold working

8. Bell metal contains

90% copper and 10% tin

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

70 - 75% copper and rest tin

70% copper and 30% zinc

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

Steel

Aluminium

Cast iron

Brass

10. In spheroidising process, the steel is

Heated below the lower critical temperature and then cooled slowly

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

None of the above

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

Page 2 of 4

11. The silicon steel is widely used for

Connecting rods

Cutting tools

Motor car crankshafts

Generators and transformers in the form of laminated cores

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

1.0%

0.5%

0.8%

0.2%

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

Mainly pearlite

Pearlite and cementite

Mainly ferrite

Ferrite and pearlite

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

Copper

Lead

Brass

Silver

15. Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%

Adding small quantities of copper

Adding carbon up to 6.3%

Adding carbon up to 2.8%

16.

Blast furnace produces following by reduction of iron ore

Malleable iron

Cast iron

Pig iron

Wrought iron

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

Nickel

Manganese

Magnesium

Silicon

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

None of these

More than

Less than

Equal to

19. In a hardening process, 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 slowly in the furnace

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

20. Nickel in steel

Improves cutting ability and reduces hardenability

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

Improves wear resistance, cutting ability and toughness

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

Page 3 of 4

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

Magnetic steel alloys

Chromium alloys

Titanium alloys

Magnesium alloys

22. The correct composition of Babbitt metal is

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

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

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

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

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

Aluminium bronze

Silicon bronze

Babbitt metal

Gun metal

24. Y-alloy contains

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

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese 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

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

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

None of the above

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

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

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

26. A coarse grained steel

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

Is less tough 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 greater tendency to distort during heat treatment

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

Improving machining properties

Raising the elastic limit

Providing corrosion resistance

Providing high strength at elevated temperatures

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

Delta metal

Monel metal

Constantan

Nichrome

29. 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 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 suddenly in a suitable cooling medium

30. Pipes for bicycle frames are made of

Cast steel

Hot rolled steel

Forged steel

Cold rolled steel

Page 4 of 4

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

Intermetallic compounds

All of the above

Interstitial solid solution

Substitutional solid solution

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

Aluminium

Iron

Nickel

Copper

33. The percentage carbon content in wrought iron is about

0.02

0.4

0.2

0.1

34. Which of the following statement is wrong?

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

Steel with 0.8% carbon is wholly pearlite

The cementite is identified as round particles in the structure

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

30° C to 50° C below upper critical temperature

30° C to 50° C above lower critical temperature

30° C to 50° C below lower critical temperature

30° C to 50° C above upper critical temperature

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

Thorium

Niobium

Uranium

All of these

37. Body centered cubic space lattice is found in

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

Alpha iron, tungsten, chromium and molybdenum

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

Phosphorus

Silicon

Sulphur

Manganese

39. Dow metal contains

90% aluminium and 90% copper

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

90% magnesium and 9% aluminium with some copper

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

40. Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities

50% or more iron

Alloying elements like chromium, tungsten nickel and copper

80% or more iron

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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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