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Engineering Materials
2

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

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

Stiffness

Strength

Toughness

Brittleness

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

Chromium

Silicon

Copper

Nickel

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

Hindalium

Duralumin

Magnalium

Y-alloy

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

Chromium, titanium, vanadium

Tungsten, chromium, titanium

Vanadium, chromium, tungsten

Tungsten, titanium, vanadium

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

It can be forged

It is lighter than pure aluminium

It has good machining properties

It is prone to age hardening

6. Gamma-iron occurs between the temperature ranges of

400°C to 600°C

900°C to 1400°C

600°C to 900°C

1400°C to 1530°C

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

Machinability

Weldability

Hardenability

Formability

8. Tungsten in steel

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

Improves wear resistance, cutting ability and toughness

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

Improves cutting ability and reduces hardenability

9. 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

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

0.4 to 0.6%

0.6 to 0.8%

0.04%

0.35 to 0.45%

Page 2 of 4

11. Hematite iron ore contains iron about

70%

30%

45%

55%

12. Points of arrest for iron correspond to

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

Stages at which properties do not change with increase in temperature

There is nothing like points of arrest

Stages at which allotropic forms change

13. The usual composition of a soldering alloy is

Tin, lead and silver

Tin, lead and small percentage of antimony

Tin and copper

Tin and lead

14. Taps dies and drills contain carbon

Above 1%

Below 0.5%

Above 2.2%

Below 1%

15. The unit cells

All of the above

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

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

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

Silicon bronze

Phosphor bronze

White metal

Monel metal

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

Basic

Neutral

Acidic

Brittle

18. The coke in the charge of blast furnace

Controls the grade of pig iron

Acts as an iron bearing mineral

Forms a slag by combining with impurities

Supplies heat to reduce ore and melt the iron

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

Alpha iron, beta iron and gamma iron

Alpha iron and beta iron

Body centered cubic iron and face centered cubic iron

Alpha iron, gamma iron and delta iron

20. Cementite consist of

6.67% carbon and 93.33% iron

13% cementite and 87% ferrite

13% ferrite and 87% cementite

13% carbon and 87% ferrite

Page 3 of 4

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

By forming a bulge

In direction perpendicular to application of load

By crushing into thousands of pieces

By shearing along oblique plane

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

50 : 20 : 20 : 10

50 : 20 : 10 : 20

30 : 20 : 30 : 20

40 : 30 : 20 : 10

23. The machinability of steel is improved by adding

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

Chromium

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

Surface defect

Line defect

None of these

Point defect

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

Plasticity

Ductility

Elasticity

Malleability

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

2.5 to 4.5%

0.5 to 1%

1.2%

5 to 7%

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

Bosh

Hearth

Throat

Stack

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

Cast steel

Admiralty metal

Cast iron

Brass

29. Cobalt in steel

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti corrosion property

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

Improves cutting ability and reduce hardenability

30. There are fourteen atoms in a unit cell of

Face centered cubic space lattice

None of these

Body centered cubic space lattice

Close packed hexagonal space lattice

Page 4 of 4

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

Reduce segregation in casting

Induce stresses

Refine grain structure

Improve mechanical properties

32. The hardness of steel primarily depends on

Percentage of alloying elements

Heat treatment employed

Percentage of carbon

Shape of carbides and their distribution in iron

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

Malleability

Plasticity

Ductility

Brittleness

34. Brass contains

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

90% copper and 10% tin

70% copper and 30% zinc

70 - 75% copper and rest tin

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

Brittleness

Stiffness

Toughness

Strength

36. Corundum contains more than 95%

MgO

Al₂O₃

SiO₂

Steel

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

F.C.C. crystal structure

B.C.C. crystalline structure

H.C.P. structure

A complex cubic structure

38. The tensile strength of wrought iron is maximum

Uniform in all directions

Along the lines of slag distribution

None of the above

Perpendicular to lines of slag distribution

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

0.55 to 1.0%

0.45 to 0.55%

0.20 to 0.45%

0.05 to 0.20%

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

1500 VPN

1000 to 1100 VPN

250 VPN

600 VPN

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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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