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

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

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

2. Normalising of steel is done to

Refine the grain structure

Remove strains caused by cold working

Remove dislocations caused in the internal structure due to hot working

All of the above

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

Nichrome

Monel metal

Constantan

Delta metal

4. Body centered cubic space lattice is found in

Alpha iron, tungsten, chromium and molybdenum

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

5. Bell metal contains

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

70 - 75% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

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

Aluminium

Nickel

Copper

Iron

7. In spheroidising process, the steel is

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

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

None of the above

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

All of the above

Substitutional solid solution

Interstitial solid solution

Intermetallic compounds

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

Equal to

More than

None of these

Less than

10. Pipes for bicycle frames are made of

Forged steel

Cast steel

Cold rolled steel

Hot rolled steel

Page 2 of 4

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

Lead

Copper

Silver

Brass

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

30° C to 50° C below upper critical temperature

30° C to 50° C below lower critical temperature

30° C to 50° C above upper critical temperature

30° C to 50° C above lower critical temperature

13.

Blast furnace produces following by reduction of iron ore

Malleable iron

Wrought iron

Cast iron

Pig iron

14. Amorphous material is one

Which is not attacked by phosphorous

In which atoms align themselves in a geometric pattern upon solidification

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

15. Tensile strength of steel can be safely increased by

Adding carbon up to 6.3%

Adding carbon up to 2.8%

Adding small quantities of copper

Adding carbon up to 0.83%

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

None of the above

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

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

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

More than

Less than

Equal to

None of these

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

Mainly pearlite

Ferrite and pearlite

Mainly ferrite

Pearlite and cementite

19. For a steel containing 0.8% carbon

There is no critical point

There are two critical points

There is only one critical point

There can be any number of critical points

20. 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

Page 3 of 4

21. Dow metal contains

90% magnesium and 9% aluminium with some copper

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

90% aluminium and 90% copper

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

22. 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

23. Pick up the wrong statement

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

Aluminium in steel results in excessive grain growth

Tungsten in steels improves magnetic properties and hardenability

Manganese in steel induces hardness

24. The correct composition of Babbitt metal is

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

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

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

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

25. The percentage carbon content in wrought iron is about

0.2

0.1

0.4

0.02

26. In process annealing, the hypo eutectoid steel is

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 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

27. The composition of silver solder is

Silver, copper, zinc

Silver, lead, zinc

Silver, tin, nickel

Silver, copper, aluminium

28. The charge of the blast furnace consists of

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

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

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

Calcined ore, coke and limestone all in equal parts

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

Silicon

Nickel

Magnesium

Manganese

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

0.8%

0.5%

0.2%

1.0%

Page 4 of 4

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

Brass

Aluminium

Cast iron

Steel

32. A coarse grained steel

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

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

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

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

33. Steel contains

50% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

Alloying elements like chromium, tungsten nickel and copper

80% or more iron

34. Which of the following statement is wrong?

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

The cementite is identified as round particles in the structure

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

Steel with 0.8% carbon is wholly pearlite

35. The silicon steel is widely used for

Motor car crankshafts

Generators and transformers in the form of laminated cores

Connecting rods

Cutting tools

36. 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

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

Gun metal

Aluminium bronze

Silicon bronze

Babbitt metal

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

Chromium alloys

Titanium alloys

Magnetic steel alloys

Magnesium alloys

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

Sulphur

Phosphorus

Silicon

Manganese

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

Niobium

Thorium

All of these

Uranium

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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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