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Engineering Materials
2

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

1. 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

2. Cobalt in steel

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 wear resistance, cutting ability and toughness

Improves cutting ability and reduce hardenability

3. Points of arrest for iron correspond to

Stages at which allotropic forms change

There is nothing like points of arrest

Stages at which properties do not change with increase in temperature

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

4. The machinability of steel is improved by adding

Nickel and chromium

Sulphur, lead and phosphorus

Chromium

Nickel

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

250 VPN

1000 to 1100 VPN

1500 VPN

600 VPN

6. 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

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

Magnalium

Duralumin

Y-alloy

Hindalium

8. Corundum contains more than 95%

Steel

MgO

SiO₂

Al₂O₃

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

White metal

Monel metal

Silicon bronze

Phosphor bronze

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

Brittle

Acidic

Basic

Neutral

Page 2 of 4

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

30 : 20 : 30 : 20

50 : 20 : 20 : 10

50 : 20 : 10 : 20

40 : 30 : 20 : 10

12. The coke in the charge of blast furnace

Forms a slag by combining with impurities

Controls the grade of pig iron

Supplies heat to reduce ore and melt the iron

Acts as an iron bearing mineral

13. Gamma-iron occurs between the temperature ranges of

900°C to 1400°C

1400°C to 1530°C

600°C to 900°C

400°C to 600°C

14. Brass contains

70 - 75% copper and rest tin

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

70% copper and 30% zinc

90% copper and 10% tin

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

5 to 7%

0.5 to 1%

2.5 to 4.5%

1.2%

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

Reduce segregation in casting

Induce stresses

Refine grain structure

Improve mechanical properties

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

Stack

Hearth

Bosh

Throat

18. Tungsten in steel

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

Improves cutting ability and reduces hardenability

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

Improves wear resistance, cutting ability and toughness

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

Silicon

Copper

Chromium

Nickel

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

Cast iron

Cast steel

Admiralty metal

Brass

Page 3 of 4

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

It has good machining properties

It can be forged

It is lighter than pure aluminium

It is prone to age hardening

22. The usual composition of a soldering alloy is

Tin and copper

Tin, lead and small percentage of antimony

Tin and lead

Tin, lead and silver

23. The unit cells

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

Have the same orientation and their similar faces are parallel

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

Strength

Brittleness

Toughness

Stiffness

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

A complex cubic structure

H.C.P. structure

B.C.C. crystalline structure

F.C.C. crystal structure

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

Ductility

Elasticity

Malleability

Plasticity

27. Hematite iron ore contains iron about

45%

70%

55%

30%

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

Alpha iron and beta iron

Alpha iron, gamma iron and delta iron

Alpha iron, beta iron and gamma iron

Body centered cubic iron and face centered cubic iron

29. 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

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

Toughness

Stiffness

Brittleness

Strength

Page 4 of 4

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

None of these

Point defect

Surface defect

Line defect

32. The tensile strength of wrought iron is maximum

Perpendicular to lines of slag distribution

Uniform in all directions

None of the above

Along the lines of slag distribution

33. The hardness of steel primarily depends on

Percentage of carbon

Heat treatment employed

Shape of carbides and their distribution in iron

Percentage of alloying elements

34. Ductility of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to recover its original form

All of the above

Ability to undergo large permanent deformations in compression

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

Chromium, titanium, vanadium

Tungsten, chromium, titanium

Tungsten, titanium, vanadium

Vanadium, chromium, tungsten

36. Taps dies and drills contain carbon

Below 0.5%

Above 1%

Above 2.2%

Below 1%

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

Machinability

Weldability

Formability

Hardenability

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

Brittleness

Malleability

Ductility

Plasticity

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

0.04%

0.4 to 0.6%

0.6 to 0.8%

0.35 to 0.45%

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

0.45 to 0.55%

0.55 to 1.0%

0.20 to 0.45%

0.05 to 0.20%

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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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