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Engineering Materials
0

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

1. Pipes for bicycle frames are made of

Hot rolled steel

Forged steel

Cold rolled steel

Cast steel

2.

Blast furnace produces following by reduction of iron ore

Cast iron

Malleable iron

Pig iron

Wrought iron

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

Delta metal

Constantan

Nichrome

Monel metal

4. The percentage carbon content in wrought iron is about

0.02

0.4

0.1

0.2

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

Niobium

Uranium

All of these

Thorium

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

Copper

Brass

Lead

Silver

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

Sulphur

Silicon

Manganese

Phosphorus

8. 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

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

Chromium alloys

Magnetic steel alloys

Titanium alloys

Magnesium alloys

10. 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 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

Page 2 of 4

11. 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

12. 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

More than

Less than

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

Intermetallic compounds

All of the above

Interstitial solid solution

Substitutional solid solution

14. Bell metal contains

70 - 75% copper and rest tin

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

90% copper and 10% tin

70% copper and 30% zinc

15. The composition of silver solder is

Silver, copper, zinc

Silver, tin, nickel

Silver, lead, zinc

Silver, copper, aluminium

16. 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

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

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

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

None of these

Less than

Equal to

More than

18. In process annealing, the hypo eutectoid steel is

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 in still air

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

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

Aluminium

Cast iron

Steel

Brass

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

Providing high strength at elevated temperatures

Raising the elastic limit

Improving machining properties

Providing corrosion resistance

Page 3 of 4

21. Normalising of steel is done to

Remove dislocations caused in the internal structure due to hot working

All of the above

Refine the grain structure

Remove strains caused by cold working

22. 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

23. The silicon steel is widely used for

Connecting rods

Generators and transformers in the form of laminated cores

Motor car crankshafts

Cutting tools

24. Amorphous material is one

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 is not attacked by phosphorous

Which emits fumes on melting

25. Y-alloy contains

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

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

26. 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 (4 parts), coke (1 part) and limestone (8 parts)

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

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

Nickel

Manganese

Magnesium

Silicon

28. 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

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

None of the above

29. 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

30. Dow metal contains

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

90% magnesium and 9% aluminium with some copper

Page 4 of 4

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

Aluminium bronze

Gun metal

Silicon bronze

Babbitt metal

32. Tensile strength of steel can be safely increased by

Adding small quantities of copper

Adding carbon up to 6.3%

Adding carbon up to 0.83%

Adding carbon up to 2.8%

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

0.5%

0.8%

0.2%

1.0%

34. 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

35. Which of the following statement is wrong?

The cementite is identified as round particles in the structure

Steel with 0.8% carbon is wholly pearlite

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. For a steel containing 0.8% carbon

There can be any number of critical points

There is only one critical point

There is no critical point

There are two critical points

37. Pick up the wrong statement

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

Manganese in steel induces hardness

Aluminium in steel results in excessive grain growth

38. Nickel in steel

Improves cutting ability and reduces hardenability

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

39. 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

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

Nickel

Aluminium

Copper

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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