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Engineering Materials
0

Engineering Materials Practice Set-1

May 7, 2021

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25%

Page 1 of 4

1. The percentage carbon content in wrought iron is about

0.2

0.1

0.02

0.4

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

Delta metal

Nichrome

Monel metal

Constantan

3. 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

4. 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

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

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

Titanium alloys

Magnetic steel alloys

Magnesium alloys

Chromium alloys

6. In spheroidising process, the steel is

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

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

None of the above

7. Pipes for bicycle frames are made of

Cast steel

Forged steel

Hot rolled steel

Cold rolled steel

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

Aluminium

Brass

Steel

Cast iron

9. 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

10. Tensile strength of steel can be safely increased by

Adding small quantities of copper

Adding carbon up to 6.3%

Adding carbon up to 2.8%

Adding carbon up to 0.83%

Page 2 of 4

11. 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

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

Manganese

Magnesium

Nickel

Silicon

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

0.8%

0.5%

1.0%

0.2%

14. In a hardening process, 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

15. Pick up the wrong statement

Aluminium in steel results in excessive grain growth

Tungsten in steels improves magnetic properties and hardenability

Manganese in steel induces hardness

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

16. The silicon steel is widely used for

Cutting tools

Connecting rods

Generators and transformers in the form of laminated cores

Motor car crankshafts

17. 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

18. The composition of silver solder is

Silver, copper, zinc

Silver, lead, zinc

Silver, tin, nickel

Silver, copper, aluminium

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

Pearlite and cementite

Ferrite and pearlite

Mainly ferrite

20. 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

Page 3 of 4

21. For a steel containing 0.8% carbon

There can be any number of critical points

There are two critical points

There is no critical point

There is only one critical point

22. Dow metal contains

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

90% magnesium and 9% aluminium with some copper

90% aluminium and 90% copper

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

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

Is less tough and has a less tendency to distort during heat treatment

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

30° C to 50° C below upper critical temperature

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

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

Intermetallic compounds

Interstitial solid solution

Substitutional solid solution

All of the above

26. 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

27.

Blast furnace produces following by reduction of iron ore

Wrought iron

Pig iron

Malleable iron

Cast iron

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

Sulphur

Manganese

Silicon

Phosphorus

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

Aluminium

Copper

Iron

Nickel

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

Improving machining properties

Raising the elastic limit

Providing corrosion resistance

Providing high strength at elevated temperatures

Page 4 of 4

31. The charge of the blast furnace consists of

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

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

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

Calcined ore, coke and limestone all in equal parts

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

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

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

33. Amorphous material is one

Which emits fumes on melting

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

In which atoms align themselves in a geometric pattern upon solidification

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

None of these

Less than

More than

Equal to

35. 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

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

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

36. Which of the following statement is wrong?

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

The cementite is identified as round particles in the structure

Steel with 0.8% carbon is wholly pearlite

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

Babbitt metal

Silicon bronze

Gun metal

Aluminium bronze

38. Steel contains

50% or more iron

Alloying elements like chromium, tungsten nickel and copper

80% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

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

Lead

Brass

Copper

Silver

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

Niobium

All of these

Uranium

Thorium

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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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