Engineering Materials Practice Set-1

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1. Pipes for bicycle frames are made of

Forged steel

Cast steel

Cold rolled steel

Hot rolled steel

2. 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 compressive strength 400 MPa and 15 percent reduction in area

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

None of the above

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

0.5%

1.0%

0.8%

0.2%

4. Y-alloy contains

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

5 to 6% tin, 2 to 3% copper and rest aluminium

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

5. 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

6. 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

Pearlite and cementite

Mainly pearlite

7. The silicon steel is widely used for

Cutting tools

Connecting rods

Motor car crankshafts

Generators and transformers in the form of laminated cores

8. Steel contains

80% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

50% or more iron

Alloying elements like chromium, tungsten nickel and copper

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

Phosphorus

Silicon

Manganese

Sulphur

10. In process annealing, 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 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 below or closes to the lower critical temperature and then cooled slowly

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11. Which of the following statement is wrong?

Steel with 0.8% carbon is wholly pearlite

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

The cementite is identified as round particles in the structure

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

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

Magnetic steel alloys

Chromium alloys

Titanium alloys

Magnesium alloys

13. Body centered cubic space lattice is found in

Alpha iron, tungsten, chromium and molybdenum

None of the above

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

14. The percentage carbon content in wrought iron is about

0.2

0.02

0.4

0.1

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

Copper

Lead

Silver

Brass

16. 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 is not attacked by phosphorous

In which atoms align themselves in a geometric pattern upon solidification

Which emits fumes on melting

17. Normalising of steel is done to

Remove strains caused by cold working

Refine the grain structure

Remove dislocations caused in the internal structure due to hot working

All of the above

18. The composition of silver solder is

Silver, tin, nickel

Silver, lead, zinc

Silver, copper, zinc

Silver, copper, aluminium

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

Delta metal

Nichrome

Monel metal

Constantan

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

Uranium

All of these

Niobium

Thorium

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21.

Blast furnace produces following by reduction of iron ore

Wrought iron

Malleable iron

Pig iron

Cast iron

22. 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

23. Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%

Adding carbon up to 2.8%

Adding carbon up to 6.3%

Adding small quantities of copper

24. A coarse grained steel

Is less tough 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 greater tendency to distort during heat treatment

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

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

Improving machining properties

Providing corrosion resistance

Raising the elastic limit

Providing high strength at elevated temperatures

26. 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 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

Heated below or closes to the lower critical temperature and then cooled slowly

27. Dow metal contains

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

90% magnesium and 9% aluminium with some copper

90% aluminium and 90% copper

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

28. For a steel containing 0.8% carbon

There is only one critical point

There is no critical point

There are two critical points

There can be any number of critical points

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

None of these

Less than

More than

Equal to

30. In spheroidising process, the steel is

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

None of the above

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

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31. Bell metal contains

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

90% copper and 10% tin

70% copper and 30% zinc

70 - 75% copper and rest tin

32. The charge of the blast furnace consists of

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

Calcined ore, coke and limestone all in equal parts

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

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

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

Copper

Nickel

Iron

Aluminium

34. 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 lower critical temperature

30° C to 50° C below upper critical temperature

30° C to 50° C above lower critical temperature

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

Intermetallic compounds

All of the above

Interstitial solid solution

Substitutional solid solution

36. Nickel in steel

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

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

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

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

Silicon bronze

Aluminium bronze

Gun metal

Babbitt metal

38. Pick up the wrong statement

Aluminium in steel results in excessive grain growth

Manganese in steel induces hardness

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

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

Magnesium

Silicon

Manganese

Nickel

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

Steel

Aluminium

Brass

Cast iron

Engineering Materials Practice Set-1

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