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Engineering Materials
0

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

1. Dow metal contains

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

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

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

Raising the elastic limit

Providing high strength at elevated temperatures

Providing corrosion resistance

Improving machining properties

3. For a steel containing 0.8% carbon

There is no critical point

There can be any number of critical points

There is only one critical point

There are two critical points

4. Bell metal contains

70% copper and 30% zinc

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

70 - 75% copper and rest tin

90% copper and 10% tin

5. 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 emits fumes on melting

Which is not attacked by phosphorous

6. 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

Ferrite and pearlite

Mainly ferrite

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

Nickel

Magnesium

Manganese

Silicon

8. In spheroidising process, the steel is

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

Heated below the lower critical temperature and then cooled slowly

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

Brass

Steel

Aluminium

Cast iron

10. 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

Page 2 of 4

11. The percentage carbon content in wrought iron is about

0.2

0.1

0.4

0.02

12. Pick up the wrong statement

Tungsten in steels improves magnetic properties and hardenability

Aluminium in steel results in excessive grain growth

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

Manganese in steel induces hardness

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

None of these

Less than

More than

Equal to

14. 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 cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

15. In a hardening process, the hypo-eutectoid steel is

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

Heated below or closes to the lower critical temperature and then cooled slowly

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

Sulphur

Phosphorus

Manganese

Silicon

17. The composition of silver solder is

Silver, copper, zinc

Silver, lead, zinc

Silver, tin, nickel

Silver, copper, aluminium

18.

Blast furnace produces following by reduction of iron ore

Malleable iron

Pig iron

Wrought iron

Cast iron

19. Normalising of steel is done to

All of the above

Remove dislocations caused in the internal structure due to hot working

Remove strains caused by cold working

Refine the grain structure

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

Intermetallic compounds

Interstitial solid solution

All of the above

Substitutional solid solution

Page 3 of 4

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

Silicon bronze

Babbitt metal

Gun metal

Aluminium bronze

22. The charge of the blast furnace consists of

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

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

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

Calcined ore, coke and limestone all in equal parts

23. A coarse grained steel

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 less tendency to distort during heat treatment

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

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

Less than

Equal to

More than

None of these

25. Body centered cubic space lattice is found in

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

None of the above

Alpha iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Uranium

All of these

Thorium

Niobium

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

0.5%

1.0%

0.2%

0.8%

28. 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%

29. 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 upper critical temperature

30° C to 50° C below lower critical temperature

30° C to 50° C above upper critical temperature

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

Brass

Copper

Silver

Lead

Page 4 of 4

31. 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

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

Magnesium alloys

Magnetic steel alloys

Titanium alloys

Chromium alloys

33. Pipes for bicycle frames are made of

Forged steel

Hot rolled steel

Cold rolled steel

Cast steel

34. Which of the following statement is wrong?

Steel with 0.8% carbon is wholly pearlite

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

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

Nickel

Iron

Aluminium

Copper

36. 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 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 suddenly in a suitable cooling medium

37. The silicon steel is widely used for

Generators and transformers in the form of laminated cores

Motor car crankshafts

Cutting tools

Connecting rods

38. 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

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

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

39. Steel contains

50% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

80% or more iron

Alloying elements like chromium, tungsten nickel and copper

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

Nichrome

Constantan

Monel metal

Delta metal

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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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