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Engineering Materials
0

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

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

All of these

Thorium

Uranium

Niobium

2. 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

3. 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

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

Magnetic steel alloys

Chromium alloys

Titanium alloys

Magnesium alloys

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

Aluminium

Nickel

Copper

Iron

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

Manganese

Magnesium

Nickel

Silicon

7. Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities

80% or more iron

50% or more iron

Alloying elements like chromium, tungsten nickel and copper

8. The percentage carbon content in wrought iron is about

0.2

0.1

0.4

0.02

9. A coarse grained steel

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

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

10.

Blast furnace produces following by reduction of iron ore

Pig iron

Cast iron

Wrought iron

Malleable iron

Page 2 of 4

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

Sulphur

Manganese

Silicon

Phosphorus

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

Nichrome

Delta metal

Constantan

Monel metal

13. Which of the following statement is wrong?

The cementite is identified as round particles in the structure

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

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

Steel with 0.8% carbon is wholly pearlite

14. 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

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

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

None of the above

16. 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

17. Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%

Adding carbon up to 2.8%

Adding small quantities of copper

Adding carbon up to 6.3%

18. 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 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

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

30° C to 50° C above lower critical temperature

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

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

More than

None of these

Less than

Equal to

Page 3 of 4

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

Brass

Lead

Silver

Copper

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

Pearlite and cementite

Mainly pearlite

Ferrite and pearlite

Mainly ferrite

23. 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

24. The silicon steel is widely used for

Motor car crankshafts

Cutting tools

Connecting rods

Generators and transformers in the form of laminated cores

25. Pipes for bicycle frames are made of

Cast steel

Hot rolled steel

Cold rolled steel

Forged steel

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 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 slowly in the furnace

27. Amorphous material is one

Which emits fumes on melting

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

28. 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

29. 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

30. In spheroidising process, the steel is

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

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

None of the above

Page 4 of 4

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

Silicon bronze

Babbitt metal

Gun metal

Aluminium bronze

32. 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

33. The charge of the blast furnace consists of

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

Calcined ore, coke and limestone all in equal parts

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

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

34. The composition of silver solder is

Silver, copper, zinc

Silver, lead, zinc

Silver, copper, aluminium

Silver, tin, nickel

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

0.8%

1.0%

0.2%

0.5%

36. 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

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

Interstitial solid solution

Intermetallic compounds

Substitutional solid solution

All of the above

38. Y-alloy contains

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese 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

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

39. Nickel in steel

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

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

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

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

Steel

Aluminium

Brass

Cast 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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