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Engineering Materials
2

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

1. 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

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

Steel

Brass

Cast iron

Aluminium

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

All of the above

Intermetallic compounds

Substitutional solid solution

Interstitial solid solution

4. In process annealing, 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 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

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

Nickel

Aluminium

Copper

Iron

6. Pick up the wrong statement

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

Manganese in steel induces hardness

Tungsten in steels improves magnetic properties and hardenability

Aluminium in steel results in excessive grain growth

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

Magnesium

Silicon

Nickel

Manganese

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

Brass

Copper

Silver

Lead

9. Y-alloy contains

5 to 6% tin, 2 to 3% 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

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

10. The composition of silver solder is

Silver, copper, zinc

Silver, lead, zinc

Silver, tin, nickel

Silver, copper, aluminium

Page 2 of 4

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

1.0%

0.2%

0.8%

0.5%

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

Silicon bronze

Aluminium bronze

Gun metal

Babbitt metal

13. Normalising of steel is done to

All of the above

Remove dislocations caused in the internal structure due to hot working

Remove strains caused by cold working

Refine the grain structure

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

Mainly pearlite

Mainly ferrite

Pearlite and cementite

Ferrite and pearlite

15. Pipes for bicycle frames are made of

Hot rolled steel

Forged steel

Cast steel

Cold rolled steel

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

Monel metal

Constantan

Nichrome

Delta metal

17. Which of the following statement is wrong?

The cementite is identified as round particles in the structure

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

Steel with 0.8% carbon is wholly pearlite

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

18. Body centered cubic space lattice is found in

Alpha iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

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

19. For a steel containing 0.8% carbon

There are two critical points

There can be any number of critical points

There is no critical point

There is only one critical point

20. 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 compressive strength 400 MPa and 15 percent reduction in area

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

Page 3 of 4

21. The charge of the blast furnace consists of

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

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

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

Calcined ore, coke and limestone all in equal parts

22. 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

23. Bell metal contains

70 - 75% copper and rest tin

70% copper and 30% zinc

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

90% copper and 10% tin

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

Sulphur

Silicon

Phosphorus

Manganese

25. The percentage carbon content in wrought iron is about

0.02

0.2

0.1

0.4

26. 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 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 suddenly in a suitable cooling medium

27. The correct composition of Babbitt metal is

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

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

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

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

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

Less than

Equal to

More than

None of these

29.

Blast furnace produces following by reduction of iron ore

Wrought iron

Cast iron

Pig iron

Malleable iron

30. The silicon steel is widely used for

Generators and transformers in the form of laminated cores

Cutting tools

Connecting rods

Motor car crankshafts

Page 4 of 4

31. 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

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

Chromium alloys

Magnetic steel alloys

Magnesium alloys

Titanium alloys

33. 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

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

Equal to

Less than

More than

None of these

35. Steel contains

Alloying elements like chromium, tungsten nickel and copper

50% or more iron

80% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

36. Dow metal contains

90% aluminium and 90% copper

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

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

90% magnesium and 9% aluminium with some copper

37. Tensile strength of steel can be safely increased by

Adding carbon up to 2.8%

Adding carbon up to 0.83%

Adding small quantities of copper

Adding carbon up to 6.3%

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

Improving machining properties

Providing high strength at elevated temperatures

Raising the elastic limit

Providing corrosion resistance

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

Niobium

Thorium

Uranium

All of these

40. 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

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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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anm"ala dig till binance says:
March 15, 2026 at 10:21 am
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创建Binance账户 says:
March 15, 2026 at 11:15 pm
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
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