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Engineering Materials
2

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

1. Which of the following elements does not impart hardness to steel?

Nickel

Silicon

Chromium

Copper

2. Corundum contains more than 95%

MgO

Steel

Al₂O₃

SiO₂

3. A specimen of aluminium metal when observed under microscope shows

A complex cubic structure

H.C.P. structure

F.C.C. crystal structure

B.C.C. crystalline structure

4. The metal suitable for bearings subjected to heavy loads, is

Silicon bronze

White metal

Monel metal

Phosphor bronze

5. Which of the following statement is incorrect about duralumin?

It is prone to age hardening

It has good machining properties

It can be forged

It is lighter than pure aluminium

6. Which of the following property is desirable for materials used in tools and machines?

Ductility

Malleability

Plasticity

Elasticity

7. The usual composition of a soldering alloy is

Tin and lead

Tin, lead and silver

Tin and copper

Tin, lead and small percentage of antimony

8. Ductility of a material can be defined as

Ability to recover its original form

All of the above

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

9. Cementite consist of

13% ferrite and 87% cementite

6.67% carbon and 93.33% iron

13% cementite and 87% ferrite

13% carbon and 87% ferrite

10. The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called

Y-alloy

Duralumin

Magnalium

Hindalium

Page 2 of 4

11. The percentage of carbon in grey iron castings usually varies between

2.5 to 4.5%

5 to 7%

0.5 to 1%

1.2%

12. The property of a material which enables it to retain the deformation permanently, is called

Brittleness

Malleability

Ductility

Plasticity

13. There are fourteen atoms in a unit cell of

Close packed hexagonal space lattice

None of these

Body centered cubic space lattice

Face centered cubic space lattice

14. The surface hardness of the following order is achieved by nitriding operation

600 VPN

250 VPN

1000 to 1100 VPN

1500 VPN

15. Large forgings, crank shafts, axles normally contain carbon up to

0.55 to 1.0%

0.20 to 0.45%

0.05 to 0.20%

0.45 to 0.55%

16. The main alloying elements high speed steel in order of increasing proportion are

Chromium, titanium, vanadium

Vanadium, chromium, tungsten

Tungsten, titanium, vanadium

Tungsten, chromium, titanium

17. The hardness of steel primarily depends on

Shape of carbides and their distribution in iron

Percentage of alloying elements

Heat treatment employed

Percentage of carbon

18. The coke in the charge of blast furnace

Acts as an iron bearing mineral

Controls the grade of pig iron

Supplies heat to reduce ore and melt the iron

Forms a slag by combining with impurities

19. Tungsten in steel

Improves wear resistance, cutting ability and toughness

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

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

Improves cutting ability and reduces hardenability

20. Which of the following metal shrinks most from molten state to solid state?

Cast steel

Cast iron

Admiralty metal

Brass

Page 3 of 4

21. The defect which takes place due to imperfect packing of atoms during crystallization is known as

Line defect

None of these

Point defect

Surface defect

22. In compression, a prism of brittle material will break

By crushing into thousands of pieces

By shearing along oblique plane

In direction perpendicular to application of load

By forming a bulge

23. If a refractory contains high content of silicon, it means refractory is

Acidic

Basic

Neutral

Brittle

24. Hematite iron ore contains iron about

30%

55%

45%

70%

25. Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature

Stages at which further heating does not increase temperature for some time

There is nothing like points of arrest

Stages at which allotropic forms change

26. The ability of a material to resist fracture due to high impact loads, is called

Strength

Brittleness

Stiffness

Toughness

27. Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

50 : 20 : 10 : 20

50 : 20 : 20 : 10

30 : 20 : 30 : 20

40 : 30 : 20 : 10

28. Which of the following represents the allotropic forms of iron?

Alpha iron, gamma iron and delta iron

Body centered cubic iron and face centered cubic iron

Alpha iron and beta iron

Alpha iron, beta iron and gamma iron

29. Cobalt in steel

Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties

Improves cutting ability and reduce hardenability

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti corrosion property

30. The unit cells

Have the same orientation and their similar faces are parallel

May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice

Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal

All of the above

Page 4 of 4

31. The tensile strength of wrought iron is maximum

Uniform in all directions

Along the lines of slag distribution

Perpendicular to lines of slag distribution

None of the above

32. Brass 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

33. The portion of the blast furnace below its widest cross-section is called

Throat

Bosh

Stack

Hearth

34. Gamma-iron occurs between the temperature ranges of

400°C to 600°C

600°C to 900°C

900°C to 1400°C

1400°C to 1530°C

35. The machinability of steel is improved by adding

Chromium

Nickel and chromium

Nickel

Sulphur, lead and phosphorus

36. Which of the following property is desirable in parts subjected to shock and impact loads?

Toughness

Brittleness

Strength

Stiffness

37. According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is

0.04%

0.6 to 0.8%

0.4 to 0.6%

0.35 to 0.45%

38. Which is false statement about normalizing? Normalizing is done to

Induce stresses

Refine grain structure

Reduce segregation in casting

Improve mechanical properties

39. Taps dies and drills contain carbon

Below 0.5%

Above 2.2%

Above 1%

Below 1%

40. In low carbon steels, presence of small quantities of sulphur improves

Formability

Hardenability

Weldability

Machinability

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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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