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.

More than

Equal to

Less than

None of these

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

Mainly ferrite

Pearlite and cementite

Mainly pearlite

Ferrite and pearlite

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

1.0%

0.2%

0.5%

0.8%

4. 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

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

Thorium

Niobium

All of these

Uranium

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

Aluminium bronze

Gun metal

Babbitt metal

Silicon bronze

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

Steel

Cast iron

Aluminium

Brass

8. Tensile strength of steel can be safely increased by

Adding carbon up to 6.3%

Adding carbon up to 2.8%

Adding carbon up to 0.83%

Adding small quantities of copper

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

Substitutional solid solution

Interstitial solid solution

All of the above

Intermetallic compounds

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

Brass

Lead

Copper

Silver

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

Magnesium

Silicon

Manganese

Nickel

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

Phosphorus

Manganese

Sulphur

Silicon

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

Magnesium alloys

Chromium alloys

Magnetic steel alloys

Titanium alloys

14. 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

15. The composition of silver solder is

Silver, copper, zinc

Silver, copper, aluminium

Silver, tin, nickel

Silver, lead, zinc

16. 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

17. Which of the following statement is wrong?

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

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

Steel with 0.8% carbon is wholly pearlite

The cementite is identified as round particles in the structure

18. Nickel in steel

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

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

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

19. 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

20. Bell metal contains

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

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin

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21. 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 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 from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

22. The correct composition of Babbitt metal is

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

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

23. 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 slowly in the furnace

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

24. 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, 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

25. The silicon steel is widely used for

Generators and transformers in the form of laminated cores

Connecting rods

Motor car crankshafts

Cutting tools

26. The percentage carbon content in wrought iron is about

0.02

0.1

0.2

0.4

27. Normalising of steel is done to

Remove strains caused by cold working

All of the above

Refine the grain structure

Remove dislocations caused in the internal structure due to hot working

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

Copper

Nickel

Iron

Aluminium

29. 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 (1 part), coke (8 parts) and limestone (4 parts)

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

30.

Blast furnace produces following by reduction of iron ore

Pig iron

Cast iron

Malleable iron

Wrought iron

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31. Dow metal contains

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

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

32. For a steel containing 0.8% carbon

There can be any number of critical points

There is no critical point

There is only one critical point

There are two critical points

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

Delta metal

Nichrome

Monel metal

Constantan

34. 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

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

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

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

Equal to

More than

None of these

Less than

37. Pick up the wrong statement

Manganese in steel induces hardness

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

Aluminium in steel results in excessive grain growth

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

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

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

39. Pipes for bicycle frames are made of

Cast steel

Forged steel

Hot rolled steel

Cold rolled steel

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

30° C to 50° C above lower critical temperature

30° C to 50° C above upper critical temperature

30° C to 50° C below upper critical temperature

30° C to 50° C below lower critical temperature

Engineering Materials Practice Set-1

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