Engineering Materials Practice Set-1

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1. Dow metal contains

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

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

90% aluminium and 90% copper

90% magnesium and 9% aluminium with some copper

2. The silicon steel is widely used for

Motor car crankshafts

Generators and transformers in the form of laminated cores

Cutting tools

Connecting rods

3. 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

4. In spheroidising process, the steel is

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

None of the above

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

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

Equal to

None of these

Less than

More than

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

Substitutional solid solution

Intermetallic compounds

Interstitial solid solution

All of the above

7. Which of the following statement is wrong?

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

Steel with 0.8% carbon is wholly 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

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

0.8%

1.0%

0.5%

0.2%

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

30° C to 50° C below 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 above upper critical temperature

10. 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

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11. The composition of silver solder is

Silver, lead, zinc

Silver, copper, zinc

Silver, copper, aluminium

Silver, tin, nickel

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

Providing corrosion resistance

Improving machining properties

Providing high strength at elevated temperatures

Raising the elastic limit

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

Monel metal

Delta metal

Nichrome

Constantan

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

Aluminium

Nickel

Copper

Iron

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

Phosphorus

Silicon

Sulphur

Manganese

16. Tensile strength of steel can be safely increased by

Adding carbon up to 2.8%

Adding small quantities of copper

Adding carbon up to 6.3%

Adding carbon up to 0.83%

17. Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities

80% or more iron

Alloying elements like chromium, tungsten nickel and copper

50% or more iron

18. Normalising of steel is done to

Remove strains caused by cold working

Remove dislocations caused in the internal structure due to hot working

Refine the grain structure

All of the above

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

Aluminium

Steel

Brass

Cast iron

20.

Blast furnace produces following by reduction of iron ore

Malleable iron

Pig iron

Wrought iron

Cast iron

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

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

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

None of the above

22. Pipes for bicycle frames are made of

Forged steel

Hot rolled steel

Cast steel

Cold rolled steel

23. The correct composition of Babbitt metal is

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

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

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

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

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

Chromium alloys

Magnetic steel alloys

Titanium alloys

Magnesium alloys

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

Copper

Lead

Brass

Silver

26. Y-alloy contains

4 to 4.5% magnesium, 3 to 4% copper 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

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

27. A coarse grained steel

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

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

28. The percentage carbon content in wrought iron is about

0.1

0.02

0.4

0.2

29. 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 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

30. 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)

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31. For a steel containing 0.8% carbon

There are two critical points

There can be any number of critical points

There is no critical point

There is only one critical point

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

Silicon

Magnesium

Nickel

Manganese

33. Bell metal contains

70 - 75% copper and rest tin

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

70% copper and 30% zinc

90% copper and 10% tin

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

Less than

None of these

Equal to

More than

35. 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 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

36. Nickel in steel

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

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

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

37. Amorphous material is one

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

Which emits fumes on melting

Which is not attacked by phosphorous

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

Silicon bronze

Babbitt metal

Gun metal

Aluminium bronze

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

Mainly ferrite

Ferrite and pearlite

Pearlite and cementite

Mainly pearlite

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

Uranium

All of these

Niobium

Thorium

Engineering Materials Practice Set-1

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