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Engineering Materials
2

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

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

By shearing along oblique plane

In direction perpendicular to application of load

By forming a bulge

By crushing into thousands of pieces

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

Duralumin

Y-alloy

Magnalium

Hindalium

3. Ductility of a material can be defined as

All of the above

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

Ability to recover its original form

4. Brass contains

70% copper and 30% zinc

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

70 - 75% copper and rest tin

90% copper and 10% tin

5. 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

40 : 30 : 20 : 10

30 : 20 : 30 : 20

6. Hematite iron ore contains iron about

45%

55%

70%

30%

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

Formability

Weldability

Hardenability

Machinability

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

600 VPN

250 VPN

1500 VPN

1000 to 1100 VPN

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

Monel metal

Phosphor bronze

Silicon bronze

White metal

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

0.04%

0.35 to 0.45%

0.6 to 0.8%

0.4 to 0.6%

Page 2 of 4

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

Toughness

Stiffness

Strength

Brittleness

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

Elasticity

Plasticity

Malleability

Ductility

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

Tungsten, titanium, vanadium

Vanadium, chromium, tungsten

Chromium, titanium, vanadium

Tungsten, chromium, titanium

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

H.C.P. structure

A complex cubic structure

B.C.C. crystalline structure

F.C.C. crystal structure

15. There are fourteen atoms in a unit cell of

None of these

Face centered cubic space lattice

Close packed hexagonal space lattice

Body centered cubic space lattice

16. The hardness of steel primarily depends on

Heat treatment employed

Shape of carbides and their distribution in iron

Percentage of alloying elements

Percentage of carbon

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

Chromium

Copper

Nickel

Silicon

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

Cast iron

Admiralty metal

Brass

Cast steel

19. The coke in the charge of blast furnace

Supplies heat to reduce ore and melt the iron

Acts as an iron bearing mineral

Controls the grade of pig iron

Forms a slag by combining with impurities

20. Corundum contains more than 95%

Al₂O₃

MgO

SiO₂

Steel

Page 3 of 4

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

Strength

Toughness

Stiffness

Brittleness

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

It is lighter than pure aluminium

It has good machining properties

It can be forged

It is prone to age hardening

23. Gamma-iron occurs between the temperature ranges of

900°C to 1400°C

1400°C to 1530°C

400°C to 600°C

600°C to 900°C

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

0.5 to 1%

1.2%

2.5 to 4.5%

5 to 7%

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

Ductility

Malleability

Plasticity

Brittleness

26. Cementite consist of

13% cementite and 87% ferrite

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

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

Reduce segregation in casting

Refine grain structure

Improve mechanical properties

Induce stresses

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

Surface defect

Point defect

Line defect

None of these

29. Tungsten in steel

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

Improves wear resistance, cutting ability and toughness

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

Hearth

Throat

Stack

Bosh

Page 4 of 4

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

0.05 to 0.20%

0.45 to 0.55%

0.55 to 1.0%

0.20 to 0.45%

32. Points of arrest for iron correspond to

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

Stages at which allotropic forms change

There is nothing like points of arrest

Stages at which properties do not change with increase in temperature

33. 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

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

34. The usual composition of a soldering alloy is

Tin and copper

Tin, lead and small percentage of antimony

Tin, lead and silver

Tin and lead

35. 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

36. Taps dies and drills contain carbon

Below 1%

Above 2.2%

Above 1%

Below 0.5%

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

Basic

Neutral

Brittle

Acidic

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

Alpha iron and beta iron

Body centered cubic iron and face centered cubic iron

Alpha iron, gamma iron and delta iron

Alpha iron, beta iron and gamma iron

39. The tensile strength of wrought iron is maximum

Along the lines of slag distribution

None of the above

Uniform in all directions

Perpendicular to lines of slag distribution

40. The machinability of steel is improved by adding

Nickel

Chromium

Nickel and chromium

Sulphur, lead and phosphorus

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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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