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Engineering Materials
0

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

1. Steel contains

Alloying elements like chromium, tungsten nickel and copper

Elements like phosphorus, sulphur and silicon in varying quantities

80% or more iron

50% or more iron

2. Nickel in steel

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

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

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

3. 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

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

Mainly ferrite

Pearlite and cementite

Mainly pearlite

Ferrite and pearlite

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

Magnetic steel alloys

Titanium alloys

Chromium alloys

Magnesium alloys

6.

Blast furnace produces following by reduction of iron ore

Cast iron

Wrought iron

Pig iron

Malleable iron

7. A coarse grained steel

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

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

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

Sulphur

Phosphorus

Manganese

Silicon

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

1.0%

0.2%

0.5%

0.8%

10. The percentage carbon content in wrought iron is about

0.1

0.02

0.2

0.4

Page 2 of 4

11. Normalising of steel is done to

Remove dislocations caused in the internal structure due to hot working

All of the above

Remove strains caused by cold working

Refine the grain structure

12. The correct composition of Babbitt metal is

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

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

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

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

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

Iron

Aluminium

Copper

Nickel

14. Bell metal contains

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

70% copper and 30% zinc

70 - 75% copper and rest tin

90% copper and 10% tin

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

Cast iron

Aluminium

Steel

Brass

16. The composition of silver solder is

Silver, tin, nickel

Silver, copper, zinc

Silver, copper, aluminium

Silver, lead, zinc

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

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

Providing corrosion resistance

Improving machining properties

Raising the elastic limit

Providing high strength at elevated temperatures

19. The silicon steel is widely used for

Motor car crankshafts

Cutting tools

Connecting rods

Generators and transformers in the form of laminated cores

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

Gun metal

Babbitt metal

Silicon bronze

Aluminium bronze

Page 3 of 4

21. 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

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

Equal to

Less than

None of these

More than

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

Manganese

Nickel

Magnesium

Silicon

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

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

None of the above

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

25. Body centered cubic space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Alpha iron, tungsten, chromium and molybdenum

None of the above

26. Tensile strength of steel can be safely increased by

Adding carbon up to 6.3%

Adding small quantities of copper

Adding carbon up to 2.8%

Adding carbon up to 0.83%

27. For a steel containing 0.8% carbon

There can be any number of critical points

There is no critical point

There are two critical points

There is only one critical point

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

Silver

Copper

Lead

Brass

29. Y-alloy contains

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

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

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

30. 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

Page 4 of 4

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

Heated below the lower critical temperature and then cooled slowly

32. Dow metal contains

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

90% magnesium and 9% aluminium with some copper

90% aluminium and 90% copper

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

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

30° C to 50° C below lower critical temperature

30° C to 50° C below upper critical temperature

30° C to 50° C above upper critical temperature

30° C to 50° C above lower critical temperature

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

Niobium

Uranium

All of these

Thorium

35. The charge of the blast furnace consists of

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

Calcined ore, coke and limestone all in equal parts

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

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

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

Monel metal

Nichrome

Constantan

Delta metal

37. Pipes for bicycle frames are made of

Forged steel

Cold rolled steel

Hot rolled steel

Cast steel

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

Equal to

None of these

Less than

More than

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

Interstitial solid solution

Intermetallic compounds

All of the above

Substitutional solid solution

40. Amorphous material is one

In which atoms align themselves in a geometric pattern upon solidification

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

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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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