Engineering Materials Practice Set-1

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1. The composition of silver solder is

Silver, copper, zinc

Silver, tin, nickel

Silver, copper, aluminium

Silver, lead, zinc

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

Pearlite and cementite

Mainly pearlite

Ferrite and pearlite

Mainly ferrite

3. Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities

80% or more iron

50% or more iron

Alloying elements like chromium, tungsten nickel and copper

4. The silicon steel is widely used for

Connecting rods

Generators and transformers in the form of laminated cores

Cutting tools

Motor car crankshafts

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

Copper

Nickel

Aluminium

Iron

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

0.5%

1.0%

0.8%

0.2%

7. Which of the following statement is wrong?

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

Steel with 0.8% carbon is wholly pearlite

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

Lead

Brass

Silver

Copper

9.

Blast furnace produces following by reduction of iron ore

Malleable iron

Pig iron

Cast iron

Wrought iron

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

All of the above

Interstitial solid solution

Substitutional solid solution

Intermetallic compounds

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

Less than

None of these

Equal to

More than

12. Amorphous material is one

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

Which emits fumes on melting

Which is not attacked by phosphorous

13. Y-alloy contains

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

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

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

Chromium alloys

Titanium alloys

Magnesium alloys

Magnetic steel alloys

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

Manganese

Sulphur

Phosphorus

Silicon

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

None of these

Less than

Equal to

More than

17. 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

18. In process annealing, the hypo eutectoid steel is

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

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

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

Nichrome

Monel metal

Delta metal

Constantan

20. A coarse grained steel

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

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

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21. 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

22. 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

23. Bell metal contains

90% copper and 10% tin

70% copper and 30% zinc

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

70 - 75% copper and rest tin

24. In a hardening process, the hypo-eutectoid steel is

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

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 slowly in the furnace

25. The percentage carbon content in wrought iron is about

0.4

0.1

0.02

0.2

26. 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 lower critical temperature

30° C to 50° C above upper critical temperature

27. 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

Aluminium in steel results in excessive grain growth

Tungsten in steels improves magnetic properties and hardenability

28. 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)

29. Body centered cubic space lattice is found in

Alpha iron, tungsten, chromium and molybdenum

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

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

30. 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

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31. 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

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

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

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

None of the above

33. Pipes for bicycle frames are made of

Hot rolled steel

Forged steel

Cast steel

Cold rolled steel

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

Providing high strength at elevated temperatures

Improving machining properties

Raising the elastic limit

Providing corrosion resistance

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

Improves wear resistance, cutting ability and toughness

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

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

Aluminium

Cast iron

Steel

Brass

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

Silicon

Magnesium

Nickel

Manganese

39. For a steel containing 0.8% carbon

There is no critical point

There is only one critical point

There can be any number of critical points

There are two critical points

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

Thorium

Niobium

All of these

Uranium

Engineering Materials Practice Set-1

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