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Engineering Materials
0

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

1. Pick up the wrong statement

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

Tungsten in steels improves magnetic properties and hardenability

2. 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

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

1.0%

0.5%

0.8%

0.2%

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

More than

Less than

None of these

Equal to

5. A coarse grained steel

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

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

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

Equal to

Less than

None of these

More than

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

Brass

Steel

Cast iron

Aluminium

8. 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

9. 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

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

Iron

Aluminium

Copper

Nickel

Page 2 of 4

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

Monel metal

Constantan

Nichrome

Delta metal

12. 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 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

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

Ferrite and pearlite

Pearlite and cementite

Mainly pearlite

Mainly ferrite

14. 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

15. The composition of silver solder is

Silver, copper, aluminium

Silver, lead, zinc

Silver, tin, nickel

Silver, copper, zinc

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

Providing high strength at elevated temperatures

Providing corrosion resistance

Improving machining properties

Raising the elastic limit

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

Manganese

Silicon

Phosphorus

Sulphur

18. 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

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

Nickel

Manganese

Silicon

Magnesium

20. Nickel in steel

Improves wear resistance, cutting ability and toughness

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 cutting ability and reduces hardenability

Page 3 of 4

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

All of the above

Interstitial solid solution

Substitutional solid solution

Intermetallic compounds

22. Which of the following statement is wrong?

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

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

Steel with 0.8% carbon is wholly pearlite

The cementite is identified as round particles in the structure

23. Bell metal contains

70 - 75% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

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

24. The silicon steel is widely used for

Motor car crankshafts

Cutting tools

Connecting rods

Generators and transformers in the form of laminated cores

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

Gun metal

Babbitt metal

Aluminium bronze

Silicon bronze

26. Body centered cubic space lattice is found in

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha iron, tungsten, chromium and molybdenum

None of the above

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

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

30° C to 50° C above upper critical temperature

28. Tensile strength of steel can be safely increased by

Adding carbon up to 0.83%

Adding carbon up to 6.3%

Adding small quantities of copper

Adding carbon up to 2.8%

29. 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 below the lower critical temperature and then cooled slowly

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

30. Y-alloy contains

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, 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

Page 4 of 4

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

Niobium

Uranium

All of these

Thorium

32. The charge of the blast furnace consists of

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

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)

33.

Blast furnace produces following by reduction of iron ore

Pig iron

Wrought iron

Malleable iron

Cast iron

34. The percentage carbon content in wrought iron is about

0.02

0.1

0.2

0.4

35. Pipes for bicycle frames are made of

Cold rolled steel

Cast steel

Hot rolled steel

Forged steel

36. Normalising of steel is done to

Refine the grain structure

Remove dislocations caused in the internal structure due to hot working

All of the above

Remove strains caused by cold working

37. Amorphous material is one

Which is not attacked by phosphorous

Which emits fumes on melting

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

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

Titanium alloys

Magnesium alloys

Chromium alloys

Magnetic steel alloys

39. 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

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

Brass

Silver

Lead

Copper

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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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