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.

None of these

Equal to

Less than

More than

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

More than

None of these

Less than

Equal to

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

Aluminium bronze

Gun metal

Babbitt metal

Silicon bronze

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

Substitutional solid solution

Intermetallic compounds

All of the above

Interstitial solid solution

5. Pick up the wrong statement

Manganese in steel induces hardness

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

6. Steel contains

Alloying elements like chromium, tungsten nickel and copper

80% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

50% or more iron

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

Raising the elastic limit

Providing corrosion resistance

Providing high strength at elevated temperatures

Improving machining properties

8. Body centered cubic space lattice is found in

None of the above

Alpha iron, tungsten, chromium and molybdenum

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

9. Bell metal contains

70% copper and 30% zinc

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

90% copper and 10% tin

70 - 75% copper and rest tin

10. Nickel in steel

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

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

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

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11. The charge of the blast furnace consists of

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)

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

12. 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

13. The correct composition of Babbitt metal is

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

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

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

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

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

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

30° C to 50° C above lower critical temperature

15. The percentage carbon content in wrought iron is about

0.4

0.2

0.02

0.1

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

All of these

Thorium

Uranium

Niobium

17. A coarse grained steel

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

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

18. Tensile strength of steel can be safely increased by

Adding carbon up to 6.3%

Adding small quantities of copper

Adding carbon up to 2.8%

Adding carbon up to 0.83%

19. 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

20. 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

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21. The silicon steel is widely used for

Connecting rods

Motor car crankshafts

Generators and transformers in the form of laminated cores

Cutting tools

22. 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

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

Nichrome

Monel metal

Constantan

Delta metal

24. 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

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

None of the above

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

Phosphorus

Silicon

Sulphur

Manganese

26. The composition of silver solder is

Silver, lead, zinc

Silver, copper, zinc

Silver, copper, aluminium

Silver, tin, nickel

27.

Blast furnace produces following by reduction of iron ore

Wrought iron

Malleable iron

Cast iron

Pig iron

28. 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 emits fumes on melting

Which is not attacked by phosphorous

In which atoms align themselves in a geometric pattern upon solidification

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

Iron

Nickel

Copper

Aluminium

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

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31. Dow metal contains

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

90% aluminium and 90% copper

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

1.0%

0.5%

0.8%

0.2%

33. Which of the following statement is wrong?

Steel with 0.8% carbon is wholly pearlite

The cementite is identified as round particles in the structure

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

34. Pipes for bicycle frames are made of

Cast steel

Forged steel

Hot rolled steel

Cold rolled steel

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

Titanium alloys

Magnetic steel alloys

Magnesium alloys

Chromium alloys

36. 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

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

Silicon

Manganese

Magnesium

Nickel

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

Lead

Silver

Copper

Brass

39. For a steel containing 0.8% carbon

There is only one critical point

There can be any number of critical points

There is no critical point

There are two critical points

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

Aluminium

Steel

Brass

Cast iron

Engineering Materials Practice Set-1

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