Engineering Materials Practice Set-1

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

Manganese

Sulphur

Silicon

Phosphorus

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

30° C to 50° C below lower critical temperature

30° C to 50° C below upper critical temperature

30° C to 50° C above upper critical temperature

30° C to 50° C above lower critical temperature

3. Pipes for bicycle frames are made of

Forged steel

Hot rolled steel

Cast steel

Cold rolled steel

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

Substitutional solid solution

Interstitial solid solution

Intermetallic compounds

All of the above

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

Monel metal

Constantan

Nichrome

Delta metal

6. The composition of silver solder is

Silver, tin, nickel

Silver, copper, aluminium

Silver, lead, zinc

Silver, copper, zinc

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

Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa

None of the above

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

8. The percentage carbon content in wrought iron is about

0.1

0.02

0.4

0.2

9. For a steel containing 0.8% carbon

There can be any number of critical points

There is no critical point

There are two critical points

There is only one critical point

10. 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 emits fumes on melting

Which is not attacked by phosphorous

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11. Dow metal contains

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

90% magnesium and 9% aluminium with some copper

90% aluminium and 90% copper

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

12. 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

Mainly ferrite

Pearlite and cementite

13. Bell metal contains

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

70 - 75% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

14. 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

15. 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

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

Magnesium

Manganese

Silicon

Nickel

17. Body centered cubic space lattice is found in

None of the above

Alpha iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

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

18. Normalising of steel is done to

All of the above

Refine the grain structure

Remove strains caused by cold working

Remove dislocations caused in the internal structure due to hot working

19. Steel contains

Alloying elements like chromium, tungsten nickel and copper

50% or more iron

80% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

20. The silicon steel is widely used for

Generators and transformers in the form of laminated cores

Cutting tools

Motor car crankshafts

Connecting rods

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

Providing corrosion resistance

Improving machining properties

Raising the elastic limit

Providing high strength at elevated temperatures

22. 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 (4 parts), coke (1 part) and limestone (8 parts)

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

23. 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

None of the above

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

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

Uranium

Niobium

Thorium

All of these

25. Y-alloy contains

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

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

5 to 6% tin, 2 to 3% 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

26. 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

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

Steel

Aluminium

Cast iron

Brass

28. 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 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

29. A coarse grained steel

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

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

30.

Blast furnace produces following by reduction of iron ore

Pig iron

Cast iron

Malleable iron

Wrought iron

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

1.0%

0.2%

0.5%

0.8%

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

Babbitt metal

Aluminium bronze

Gun metal

Silicon bronze

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

Copper

Nickel

Aluminium

Iron

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

Magnetic steel alloys

Titanium alloys

Magnesium alloys

Chromium alloys

35. 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

36. Which of the following statement is wrong?

The cementite is identified as round particles in the structure

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

Steel with 0.8% carbon is wholly pearlite

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

37. 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

38. Nickel in steel

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

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

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

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

Copper

Lead

Brass

Silver

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

None of these

More than

Equal to

Less than

Engineering Materials Practice Set-1

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