Engineering Materials Practice Set-1

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1. 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

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

Aluminium

Copper

Iron

Nickel

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

Interstitial solid solution

All of the above

Substitutional solid solution

Intermetallic compounds

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

Providing high strength at elevated temperatures

Improving machining properties

Raising the elastic limit

Providing corrosion resistance

5. The composition of silver solder is

Silver, copper, zinc

Silver, copper, aluminium

Silver, tin, nickel

Silver, lead, zinc

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 in still air

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

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

Babbitt metal

Gun metal

Aluminium bronze

Silicon bronze

8. Y-alloy contains

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 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

9. For a steel containing 0.8% carbon

There can be any number of critical points

There is no critical point

There are two critical points

There is only one critical point

10. The correct composition of Babbitt metal is

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

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

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11. The percentage carbon content in wrought iron is about

0.02

0.2

0.4

0.1

12. Body centered cubic space lattice is found in

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

Alpha iron, tungsten, chromium and molybdenum

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

Nickel

Silicon

Magnesium

Manganese

14. Pick up the wrong statement

Aluminium in steel results in excessive grain growth

Tungsten in steels improves magnetic properties and hardenability

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

Manganese in steel induces hardness

15. 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 (4 parts), coke (1 part) and limestone (8 parts)

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

16. Normalising of steel is done to

Remove dislocations caused in the internal structure due to hot working

Remove strains caused by cold working

All of the above

Refine the grain structure

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

Chromium alloys

Magnesium alloys

Titanium alloys

Magnetic steel alloys

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

0.2%

0.8%

0.5%

1.0%

19. The silicon steel is widely used for

Generators and transformers in the form of laminated cores

Cutting tools

Connecting rods

Motor car crankshafts

20. 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

None of the above

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

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21. 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

Ferrite and pearlite

Pearlite and cementite

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

Nichrome

Monel metal

Constantan

Delta metal

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

Silicon

Manganese

Phosphorus

Sulphur

24. A coarse grained steel

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

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

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

Aluminium

Brass

Steel

Cast iron

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

Uranium

Niobium

Thorium

All of these

27. 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 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

28. Which of the following statement is wrong?

Steel with 0.8% carbon is wholly pearlite

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

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

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

30° C to 50° C above upper critical temperature

30. Amorphous material is one

In which atoms align themselves in a geometric pattern upon solidification

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

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31. Steel contains

Alloying elements like chromium, tungsten nickel and copper

Elements like phosphorus, sulphur and silicon in varying quantities

50% or more iron

80% or more iron

32. Tensile strength of steel can be safely increased by

Adding small quantities of copper

Adding carbon up to 2.8%

Adding carbon up to 0.83%

Adding carbon up to 6.3%

33. Pipes for bicycle frames are made of

Hot rolled steel

Cast steel

Cold rolled steel

Forged steel

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

Copper

Brass

Lead

Silver

35.

Blast furnace produces following by reduction of iron ore

Pig iron

Wrought iron

Cast iron

Malleable iron

36. Bell metal contains

70 - 75% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

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

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

Equal to

Less than

None of these

More than

38. Dow metal contains

90% aluminium and 90% copper

90% magnesium and 9% aluminium with some copper

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

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

39. In spheroidising process, the steel is

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

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

40. 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

Engineering Materials Practice Set-1

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