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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. 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

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

None of the above

2. 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)

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

None of these

Equal to

Less than

More than

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

Magnesium alloys

Chromium alloys

Titanium alloys

Magnetic steel alloys

5. Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%

Adding small quantities of copper

Adding carbon up to 2.8%

Adding carbon up to 6.3%

6. The composition of silver solder is

Silver, copper, aluminium

Silver, tin, nickel

Silver, lead, zinc

Silver, copper, zinc

7.

Blast furnace produces following by reduction of iron ore

Cast iron

Wrought iron

Malleable iron

Pig iron

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

Brass

Aluminium

Steel

Cast iron

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

Silicon

Nickel

Magnesium

Manganese

10. 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 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

Page 2 of 4

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

Gun metal

Aluminium bronze

Silicon bronze

Babbitt metal

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

Thorium

Niobium

Uranium

All of these

13. Pipes for bicycle frames are made of

Cold rolled steel

Hot rolled steel

Forged steel

Cast steel

14. 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

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

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

15. Amorphous material is one

Which emits fumes on melting

In which atoms align themselves in a geometric pattern upon solidification

Which is not attacked by phosphorous

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

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

Sulphur

Silicon

Manganese

Phosphorus

17. In spheroidising process, the steel is

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

None of the above

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

18. For a steel containing 0.8% carbon

There is no critical point

There can be any number of critical points

There are two critical points

There is only one critical point

19. 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

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

Steel with 0.8% carbon is wholly pearlite

20. 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

None of these

More than

Page 3 of 4

21. 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

22. 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

Aluminium in steel results in excessive grain growth

Tungsten in steels improves magnetic properties and hardenability

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

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

30° C to 50° C below upper critical temperature

24. 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

25. Bell metal contains

90% copper and 10% tin

70 - 75% copper and rest tin

70% copper and 30% zinc

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

26. The silicon steel is widely used for

Motor car crankshafts

Generators and transformers in the form of laminated cores

Connecting rods

Cutting tools

27. Steel contains

80% or more iron

Alloying elements like chromium, tungsten nickel and copper

50% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

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

Ferrite and pearlite

Mainly pearlite

Pearlite and cementite

Mainly ferrite

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

Silver

Copper

Lead

Brass

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

Nichrome

Delta metal

Constantan

Monel metal

Page 4 of 4

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

Intermetallic compounds

All of the above

Substitutional solid solution

Interstitial solid solution

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

Iron

Aluminium

Nickel

Copper

33. Dow metal contains

90% aluminium and 90% copper

90% magnesium and 9% aluminium with some 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

34. Body centered cubic space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha iron, tungsten, chromium and molybdenum

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

None of the above

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

0.5%

1.0%

0.8%

0.2%

36. The percentage carbon content in wrought iron is about

0.2

0.1

0.4

0.02

37. Normalising of steel is done to

Refine the grain structure

Remove dislocations caused in the internal structure due to hot working

All of the above

Remove strains caused by cold working

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

Improving machining properties

Providing corrosion resistance

Providing high strength at elevated temperatures

Raising the elastic limit

39. 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

40. 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

4 to 4.5% magnesium, 3 to 4% 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

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VideRime

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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