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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

90% magnesium and 9% aluminium with some copper

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

90% aluminium and 90% copper

2. The percentage carbon content in wrought iron is about

0.4

0.02

0.1

0.2

3. Y-alloy contains

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

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

Less than

More than

Equal to

None of these

5. Pick up the wrong statement

Manganese in steel induces hardness

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

Aluminium in steel results in excessive grain growth

6. 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 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

7. 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

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

Uranium

Niobium

All of these

Thorium

9. Bell metal contains

70% copper and 30% zinc

90% copper and 10% tin

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

70 - 75% copper and rest tin

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

Aluminium

Iron

Copper

Nickel

Page 2 of 4

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

Titanium alloys

Chromium alloys

Magnesium alloys

Magnetic steel alloys

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

Sulphur

Manganese

Silicon

Phosphorus

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

More than

None of these

Equal to

Less than

14. Nickel in steel

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

Improves wear resistance, cutting ability and toughness

15. Which of the following statement is wrong?

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

The cementite is identified as round particles in the structure

Steel with 0.8% carbon is wholly pearlite

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

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

Silver

Lead

Copper

Brass

17. The charge of the blast furnace consists of

Calcined ore, coke and limestone all in equal parts

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)

18. Tensile strength of steel can be safely increased by

Adding carbon up to 2.8%

Adding carbon up to 0.83%

Adding carbon up to 6.3%

Adding small quantities of copper

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

Mainly pearlite

Mainly ferrite

Pearlite and cementite

Ferrite and pearlite

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

Nickel

Silicon

Manganese

Magnesium

Page 3 of 4

21. 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

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

Delta metal

Nichrome

Monel metal

Constantan

23. In spheroidising process, the steel is

None of the above

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

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

24. The composition of silver solder is

Silver, copper, zinc

Silver, copper, aluminium

Silver, tin, nickel

Silver, lead, zinc

25. 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 slowly in the furnace

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

26. 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

27. 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 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

28. Body centered cubic space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

None of the above

Alpha iron, tungsten, chromium and molybdenum

29. Normalising of steel is done to

Remove dislocations caused in the internal structure due to hot working

Refine the grain structure

All of the above

Remove strains caused by cold working

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

Steel

Brass

Aluminium

Cast iron

Page 4 of 4

31. The silicon steel is widely used for

Connecting rods

Motor car crankshafts

Generators and transformers in the form of laminated cores

Cutting tools

32.

Blast furnace produces following by reduction of iron ore

Malleable iron

Cast iron

Wrought iron

Pig iron

33. The correct composition of Babbitt metal is

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

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

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

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

34. A coarse grained steel

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

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

35. 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

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

30° C to 50° C above upper critical temperature

30° C to 50° C below lower critical temperature

30° C to 50° C above lower critical temperature

30° C to 50° C below upper critical temperature

37. Pipes for bicycle frames are made of

Forged steel

Cold rolled steel

Cast steel

Hot rolled steel

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

Substitutional solid solution

Intermetallic compounds

Interstitial solid solution

All of the above

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

Aluminium bronze

Babbitt metal

Silicon bronze

Gun metal

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

0.5%

1.0%

0.2%

0.8%

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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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