Engineering Materials Practice Set-1

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1. 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

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

Steel

Cast iron

Brass

Aluminium

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

Lead

Copper

Brass

Silver

4. In process annealing, 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 slowly in the furnace

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

5. Nickel in steel

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

Improves cutting ability and reduces hardenability

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

Improves wear resistance, cutting ability and toughness

6. Pipes for bicycle frames are made of

Cast steel

Forged steel

Hot rolled steel

Cold rolled steel

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

Silicon

Nickel

Manganese

Magnesium

8. The percentage carbon content in wrought iron is about

0.02

0.2

0.1

0.4

9. 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

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

Steel with 0.8% carbon is wholly pearlite

10. For a steel containing 0.8% carbon

There is no critical point

There can be any number of critical points

There are two critical points

There is only one critical point

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11. 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% Sn, 4% Cu, 8% Sb, 1% Al

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

12. Body centered cubic space lattice is found in

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

Alpha iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

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

Gun metal

Aluminium bronze

Silicon bronze

Babbitt metal

14. A coarse grained steel

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

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

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

Heated below the lower critical temperature and then cooled slowly

16. Amorphous material is one

In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

Which is not attacked by phosphorous

In which atoms align themselves in a geometric pattern upon solidification

Which emits fumes on melting

17. The silicon steel is widely used for

Cutting tools

Generators and transformers in the form of laminated cores

Motor car crankshafts

Connecting rods

18. Pick up the wrong statement

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

Tungsten in steels improves magnetic properties and hardenability

Manganese in steel induces hardness

19. Y-alloy contains

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, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese 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

20. Bell metal contains

70 - 75% copper and rest tin

70% copper and 30% zinc

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

90% copper and 10% tin

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

None of these

Equal to

More than

Less than

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

Magnesium alloys

Chromium alloys

Titanium alloys

Magnetic steel alloys

23.

Blast furnace produces following by reduction of iron ore

Pig iron

Wrought iron

Cast iron

Malleable iron

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

Mainly pearlite

Ferrite and pearlite

Pearlite and cementite

Mainly ferrite

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

Sulphur

Phosphorus

Manganese

Silicon

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

Thorium

All of these

Niobium

Uranium

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

Substitutional solid solution

All of the above

Intermetallic compounds

Interstitial solid solution

28. 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 above upper critical temperature

30° C to 50° C below upper critical temperature

29. Normalising of steel is done to

Remove strains caused by cold working

Remove dislocations caused in the internal structure due to hot working

All of the above

Refine the grain structure

30. Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%

Adding small quantities of copper

Adding carbon up to 6.3%

Adding carbon up to 2.8%

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

1.0%

0.5%

0.8%

0.2%

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

Aluminium

Nickel

Copper

Iron

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

Less than

None of these

Equal to

More than

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

Constantan

Nichrome

Delta metal

Monel metal

35. The charge of the blast furnace consists of

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

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

Calcined ore, coke and limestone all in equal parts

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

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

Raising the elastic limit

Providing corrosion resistance

Improving machining properties

Providing high strength at elevated temperatures

37. In a hardening process, 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 suddenly in a suitable cooling medium

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

38. 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

39. The composition of silver solder is

Silver, lead, zinc

Silver, copper, aluminium

Silver, copper, zinc

Silver, tin, nickel

40. Steel contains

80% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

Alloying elements like chromium, tungsten nickel and copper

50% or more iron

Engineering Materials Practice Set-1

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