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Engineering Materials
0

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

1. In spheroidising process, the steel is

None of the above

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

Heated below the lower critical temperature and then cooled slowly

2. Pick up the wrong statement

Tungsten in steels improves magnetic properties and hardenability

Manganese in steel induces hardness

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

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

Silicon

Magnesium

Manganese

Nickel

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

Constantan

Monel metal

Delta metal

Nichrome

5. 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

6. 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

7. For a steel containing 0.8% carbon

There can be any number of critical points

There are two critical points

There is only one critical point

There is no critical point

8. 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 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 suddenly in a suitable cooling medium

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

0.8%

0.5%

0.2%

1.0%

10. Pipes for bicycle frames are made of

Hot rolled steel

Cast steel

Cold rolled steel

Forged steel

Page 2 of 4

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

Cast iron

Aluminium

Brass

Steel

12. The percentage carbon content in wrought iron is about

0.1

0.02

0.4

0.2

13. 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 less tendency to distort during heat treatment

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

14. The composition of silver solder is

Silver, lead, zinc

Silver, tin, nickel

Silver, copper, zinc

Silver, copper, aluminium

15. 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

90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

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

Manganese

Silicon

Phosphorus

Sulphur

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

Providing high strength at elevated temperatures

Raising the elastic limit

Improving machining properties

Providing corrosion resistance

18. 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

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

Niobium

Uranium

All of these

Thorium

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

Brass

Lead

Copper

Silver

Page 3 of 4

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

Substitutional solid solution

Interstitial solid solution

Intermetallic compounds

All of the above

22. Dow metal contains

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% magnesium and 9% aluminium with some copper

90% aluminium and 90% copper

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

Less than

Equal to

None of these

More than

24. The silicon steel is widely used for

Motor car crankshafts

Generators and transformers in the form of laminated cores

Cutting tools

Connecting rods

25. Body centered cubic space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha iron, tungsten, chromium and molybdenum

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

None of the above

26.

Blast furnace produces following by reduction of iron ore

Pig iron

Wrought iron

Malleable iron

Cast iron

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

Copper

Nickel

Aluminium

Iron

28. 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 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

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

None of these

More than

Less than

Equal to

30. Nickel in steel

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

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

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

Page 4 of 4

31. 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

32. Bell metal contains

70 - 75% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

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

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

Titanium alloys

Magnesium alloys

Magnetic steel alloys

Chromium alloys

34. Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%

Adding carbon up to 6.3%

Adding carbon up to 2.8%

Adding small quantities of copper

35. 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

Mainly ferrite

Ferrite and pearlite

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

None of the above

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

38. 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)

39. Normalising of steel is done to

Remove dislocations caused in the internal structure due to hot working

All of the above

Refine the grain structure

Remove strains caused by cold working

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

Babbitt metal

Silicon bronze

Aluminium bronze

Gun metal

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VideRime

A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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