Engineering Materials Practice Set-1

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

Nickel

Silicon

Manganese

Magnesium

2. 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

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

Babbitt metal

Aluminium bronze

Gun metal

Silicon bronze

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

Magnetic steel alloys

Magnesium alloys

Titanium alloys

Chromium alloys

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

Interstitial solid solution

Intermetallic compounds

Substitutional solid solution

All of the above

6. The charge of the blast furnace consists of

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

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

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

Delta metal

Constantan

Monel metal

Nichrome

8. The composition of silver solder is

Silver, tin, nickel

Silver, lead, zinc

Silver, copper, aluminium

Silver, copper, zinc

9. Pipes for bicycle frames are made of

Cold rolled steel

Forged steel

Hot rolled steel

Cast steel

10. Steel contains

50% or more iron

Elements like phosphorus, sulphur and silicon in varying quantities

Alloying elements like chromium, tungsten nickel and copper

80% or more iron

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

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

Phosphorus

Silicon

Sulphur

Manganese

13. 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

14. In spheroidising process, the steel is

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

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

None of the above

Heated below the lower critical temperature and then cooled slowly

15. 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

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

Less than

Equal to

None of these

More than

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

All of these

Uranium

Niobium

Thorium

18. For a steel containing 0.8% carbon

There can be any number of critical points

There is only one critical point

There are two critical points

There is no critical point

19. 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 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

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

Brass

Cast iron

Aluminium

Steel

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21. Body centered cubic space lattice is found in

None of the above

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

Alpha iron, tungsten, chromium and molybdenum

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

22. Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%

Adding small quantities of copper

Adding carbon up to 6.3%

Adding carbon up to 2.8%

23. 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 tensile strength 400 MPa and 15 percent elongation

Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area

None of the above

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

Copper

Silver

Lead

Brass

25. Bell metal contains

70 - 75% copper and rest tin

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

70% copper and 30% zinc

90% copper and 10% tin

26. Normalising of steel is done to

Remove dislocations caused in the internal structure due to hot working

Remove strains caused by cold working

All of the above

Refine the grain structure

27. 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

28. The silicon steel is widely used for

Motor car crankshafts

Generators and transformers in the form of laminated cores

Cutting tools

Connecting rods

29. Amorphous material is one

Which is not attacked by phosphorous

Which emits fumes on melting

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

30. Which of the following statement is wrong?

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

The cementite is identified as round particles in the structure

Steel with 0.8% carbon is wholly pearlite

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

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31. A coarse grained steel

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

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

32. The percentage carbon content in wrought iron is about

0.1

0.2

0.02

0.4

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

Nickel

Copper

Iron

Aluminium

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

1.0%

0.8%

0.2%

0.5%

35.

Blast furnace produces following by reduction of iron ore

Cast iron

Wrought iron

Pig iron

Malleable iron

36. Pick up the wrong statement

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

Aluminium in steel results in excessive grain growth

Tungsten in steels improves magnetic properties and hardenability

Manganese in steel induces hardness

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

More than

Equal to

None of these

Less than

38. 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

39. 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

40. 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

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

Engineering Materials Practice Set-1

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