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Engineering Materials
0

Engineering Materials Practice Set-1

May 7, 2021

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Page 1 of 4

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

Magnetic steel alloys

Chromium alloys

Titanium alloys

Magnesium alloys

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

Delta metal

Nichrome

Monel metal

Constantan

3. Nickel in steel

Improves cutting ability and reduces hardenability

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

4. In a hardening process, 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 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

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

Gun metal

Babbitt metal

Aluminium bronze

Silicon bronze

6. Y-alloy contains

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

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

7. Body centered cubic space lattice is found in

None of the above

Alpha iron, tungsten, chromium and molybdenum

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

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

8. Which of the following statement is wrong?

The cementite is identified as round particles in the structure

Steel with 0.8% carbon is wholly pearlite

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

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

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

Silicon

Manganese

Phosphorus

Sulphur

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

Interstitial solid solution

All of the above

Intermetallic compounds

Substitutional solid solution

Page 2 of 4

11. Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities

50% or more iron

Alloying elements like chromium, tungsten nickel and copper

80% or more iron

12. 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

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

Providing corrosion resistance

Raising the elastic limit

Improving machining properties

Providing high strength at elevated temperatures

14. Dow metal contains

90% magnesium and 9% aluminium with some copper

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

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

90% aluminium and 90% copper

15. Pipes for bicycle frames are made of

Forged steel

Hot rolled steel

Cold rolled steel

Cast steel

16. Pick up the wrong statement

Aluminium in steel results in excessive grain growth

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

Tungsten in steels improves magnetic properties and hardenability

Manganese in steel induces hardness

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

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 minimum tensile strength 400 MPa and 15 percent elongation

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

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

Magnesium

Nickel

Manganese

Silicon

19. In process annealing, 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 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 in still air

20.

Blast furnace produces following by reduction of iron ore

Cast iron

Malleable iron

Pig iron

Wrought iron

Page 3 of 4

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

Nickel

Copper

Iron

Aluminium

22. Bell metal contains

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

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin

23. The charge of the blast furnace consists of

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)

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

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

Silver

Copper

Lead

Brass

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

Cast iron

Steel

Aluminium

Brass

26. The correct composition of Babbitt metal is

87% Sn, 4% Cu, 8% Sb, 1% Al

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

82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

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

27. In spheroidising process, the steel is

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

None of the above

Heated below the lower critical temperature and then cooled slowly

28. 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

Mainly pearlite

Mainly ferrite

Pearlite and cementite

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

Equal to

Less than

More than

None of these

30. The silicon steel is widely used for

Generators and transformers in the form of laminated cores

Cutting tools

Motor car crankshafts

Connecting rods

Page 4 of 4

31. The percentage carbon content in wrought iron is about

0.1

0.2

0.4

0.02

32. The composition of silver solder is

Silver, tin, nickel

Silver, copper, zinc

Silver, lead, zinc

Silver, copper, aluminium

33. For a steel containing 0.8% carbon

There are two critical points

There can be any number of critical points

There is no critical point

There is only one critical point

34. 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

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

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

30° C to 50° C below upper critical temperature

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

More than

Less than

None of these

Equal to

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

0.8%

0.2%

0.5%

1.0%

38. Normalising of steel is done to

Remove strains caused by cold working

Refine the grain structure

Remove dislocations caused in the internal structure due to hot working

All of the above

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

All of these

Thorium

Uranium

Niobium

40. Amorphous material is one

In which atoms align themselves in a geometric pattern upon solidification

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

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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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