Engineering Materials Practice Set-1

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1. In spheroidising process, the steel is

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

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

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

Brass

Cast iron

Steel

Aluminium

3. The silicon steel is widely used for

Generators and transformers in the form of laminated cores

Cutting tools

Connecting rods

Motor car crankshafts

4. Body centered cubic space lattice is found in

Alpha iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

None of the above

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

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

Lead

Copper

Silver

Brass

6. Pick up the wrong statement

Manganese in steel induces hardness

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

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

Ferrite and pearlite

Mainly ferrite

Mainly pearlite

Pearlite and cementite

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

Gun metal

Babbitt metal

Aluminium bronze

Silicon bronze

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

Monel metal

Delta metal

Nichrome

Constantan

10. For a steel containing 0.8% carbon

There is only one critical point

There is no critical point

There can be any number of critical points

There are two critical points

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11. Normalising of steel is done to

Remove strains caused by cold working

Refine the grain structure

All of the above

Remove dislocations caused in the internal structure due to hot working

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

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

Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area

13. Which of the following statement is wrong?

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

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

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

None of these

More than

Equal to

Less than

15. 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

16. 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 in still air

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

17.

Blast furnace produces following by reduction of iron ore

Pig iron

Wrought iron

Malleable iron

Cast iron

18. Pipes for bicycle frames are made of

Hot rolled steel

Forged steel

Cold rolled steel

Cast steel

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

Magnesium alloys

Chromium alloys

Titanium alloys

Magnetic steel alloys

20. The percentage carbon content in wrought iron is about

0.4

0.2

0.1

0.02

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

Equal to

More than

None of these

Less than

22. Amorphous material is one

Which emits fumes on melting

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 is not attacked by phosphorous

23. 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 (4 parts), coke (1 part) and limestone (8 parts)

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

24. 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

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

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

25. Dow metal contains

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

90% aluminium and 90% copper

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

90% magnesium and 9% aluminium with some copper

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

Uranium

Thorium

Niobium

All of these

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

All of the above

Substitutional solid solution

Interstitial solid solution

Intermetallic compounds

29. A coarse grained steel

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

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

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

Copper

Aluminium

Nickel

Iron

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31. 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

32. The composition of silver solder is

Silver, tin, nickel

Silver, copper, aluminium

Silver, lead, zinc

Silver, copper, zinc

33. Bell metal contains

90% copper and 10% tin

70% copper and 30% zinc

70 - 75% copper and rest tin

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

34. 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 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

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

Magnesium

Manganese

Silicon

Nickel

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

0.8%

1.0%

0.2%

0.5%

37. 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

38. 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

39. Nickel in steel

Improves cutting ability and reduces hardenability

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

Improves wear resistance, cutting ability and toughness

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

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

Silicon

Phosphorus

Sulphur

Manganese

Engineering Materials Practice Set-1

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