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Engineering Materials
0

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

1. The correct composition of Babbitt metal is

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

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

2. 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

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

Intermetallic compounds

All of the above

Interstitial solid solution

Substitutional solid solution

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

Monel metal

Nichrome

Constantan

Delta metal

6. Body centered cubic space lattice is found in

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

Alpha iron, tungsten, chromium and molybdenum

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Silicon

Sulphur

Manganese

Phosphorus

8. Dow metal contains

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

90% aluminium and 90% copper

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

90% magnesium and 9% aluminium with some copper

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

Copper

Iron

Nickel

Aluminium

10. 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 below the lower critical temperature and then cooled slowly

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

Page 2 of 4

11. For a steel containing 0.8% carbon

There is no critical point

There are two critical points

There is only one critical point

There can be any number of critical points

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

Nickel

Silicon

Manganese

Magnesium

13.

Blast furnace produces following by reduction of iron ore

Pig iron

Malleable iron

Cast iron

Wrought iron

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

Aluminium bronze

Babbitt metal

Gun metal

Silicon bronze

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

All of these

Uranium

Niobium

Thorium

16. The silicon steel is widely used for

Connecting rods

Cutting tools

Generators and transformers in the form of laminated cores

Motor car crankshafts

17. The composition of silver solder is

Silver, copper, zinc

Silver, copper, aluminium

Silver, lead, zinc

Silver, tin, nickel

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

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

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

19. 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

4 to 4.5% magnesium, 3 to 4% 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

20. Nickel in steel

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

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

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

Page 3 of 4

21. 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

22. 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 suddenly in a suitable cooling medium

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

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

0.2%

0.8%

0.5%

1.0%

24. 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%

25. Pick up the wrong statement

Tungsten in steels improves magnetic properties and hardenability

Aluminium in steel results in excessive grain growth

Manganese in steel induces hardness

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

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

Copper

Lead

Silver

Brass

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

Brass

Steel

Cast iron

Aluminium

28. The percentage carbon content in wrought iron is about

0.1

0.4

0.02

0.2

29. Steel contains

Alloying elements like chromium, tungsten nickel and copper

80% or more iron

50% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

30. A coarse grained steel

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

Is less tough and has a greater 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

Page 4 of 4

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

Titanium alloys

Chromium alloys

Magnetic steel alloys

Magnesium alloys

32. Bell metal contains

90% copper and 10% tin

70 - 75% copper and rest tin

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

70% copper and 30% zinc

33. 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)

34. 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

35. 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

Pearlite and cementite

Mainly ferrite

Mainly pearlite

36. 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

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

None of these

Less than

Equal to

More than

38. 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

39. Pipes for bicycle frames are made of

Cast steel

Cold rolled steel

Forged steel

Hot rolled steel

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

More than

Equal to

Less than

None of these

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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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