Engineering Materials Practice Set-1

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1. 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 in still air

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

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

Providing corrosion resistance

Raising the elastic limit

Providing high strength at elevated temperatures

Improving machining properties

3.

Blast furnace produces following by reduction of iron ore

Malleable iron

Wrought iron

Pig iron

Cast iron

4. Normalising of steel is done to

All of the above

Remove strains caused by cold working

Remove dislocations caused in the internal structure due to hot working

Refine the grain structure

5. Pipes for bicycle frames are made of

Cold rolled steel

Forged steel

Cast steel

Hot rolled steel

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

0.8%

1.0%

0.5%

0.2%

7. Pick up the wrong statement

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

Manganese in steel induces hardness

Tungsten in steels improves magnetic properties and hardenability

Aluminium in steel results in excessive grain growth

8. Amorphous material is one

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

Which emits fumes on melting

9. In spheroidising process, the steel is

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

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

10. The composition of silver solder is

Silver, lead, zinc

Silver, copper, zinc

Silver, tin, nickel

Silver, copper, aluminium

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

Steel

Aluminium

Brass

Cast iron

12. The silicon steel is widely used for

Connecting rods

Cutting tools

Motor car crankshafts

Generators and transformers in the form of laminated cores

13. 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

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

Manganese

Phosphorus

Silicon

Sulphur

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

Lead

Brass

Copper

Silver

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

Aluminium bronze

Babbitt metal

Gun metal

Silicon bronze

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

Less than

More than

None of these

Equal to

18. The charge of the blast furnace consists of

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

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

Calcined ore, coke and limestone all in equal parts

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

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

Magnetic steel alloys

Magnesium alloys

Titanium alloys

Chromium alloys

20. 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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21. 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 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

22. 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

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

More than

Less than

Equal to

None of these

24. Dow metal contains

90% magnesium and 9% aluminium with some copper

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

90% aluminium and 90% copper

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

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

Magnesium

Silicon

Nickel

Manganese

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

Interstitial solid solution

Intermetallic compounds

Substitutional solid solution

All of the above

27. 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

28. The percentage carbon content in wrought iron is about

0.4

0.02

0.1

0.2

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

Nichrome

Monel metal

Delta metal

Constantan

30. 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

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31. Y-alloy contains

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

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

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

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

Aluminium

Iron

Copper

Nickel

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

Uranium

Niobium

Thorium

All of these

34. Body centered cubic space lattice is found in

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

Alpha iron, tungsten, chromium and molybdenum

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

35. Nickel in steel

Improves cutting ability and reduces hardenability

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 wear resistance, cutting ability and toughness

36. Bell metal contains

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

70 - 75% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

37. 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

38. 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

39. 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

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

Mainly ferrite

Ferrite and pearlite

Pearlite and cementite

Mainly pearlite

Engineering Materials Practice Set-1

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