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Engineering Materials
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Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

1. 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

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

0.55 to 1.0%

0.20 to 0.45%

0.45 to 0.55%

0.05 to 0.20%

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

Ductility

Plasticity

Malleability

Elasticity

4. Gamma-iron occurs between the temperature ranges of

400°C to 600°C

900°C to 1400°C

1400°C to 1530°C

600°C to 900°C

5. Corundum contains more than 95%

SiO₂

Steel

Al₂O₃

MgO

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

Strength

Stiffness

Brittleness

Toughness

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

Phosphor bronze

Monel metal

Silicon bronze

White metal

8. The hardness of steel primarily depends on

Percentage of alloying elements

Heat treatment employed

Shape of carbides and their distribution in iron

Percentage of carbon

9. The coke in the charge of blast furnace

Supplies heat to reduce ore and melt the iron

Controls the grade of pig iron

Acts as an iron bearing mineral

Forms a slag by combining with impurities

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

Brittleness

Ductility

Plasticity

Malleability

Page 2 of 4

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

It can be forged

It has good machining properties

It is lighter than pure aluminium

It is prone to age hardening

12. The usual composition of a soldering alloy is

Tin and copper

Tin, lead and silver

Tin, lead and small percentage of antimony

Tin and lead

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

B.C.C. crystalline structure

F.C.C. crystal structure

H.C.P. structure

A complex cubic structure

14. 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

Have the same orientation and their similar faces are parallel

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

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

250 VPN

1000 to 1100 VPN

600 VPN

1500 VPN

16. Cementite consist of

13% ferrite and 87% cementite

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

17. Points of arrest for iron correspond to

Stages at which allotropic forms change

Stages at which properties do not change with increase in temperature

There is nothing like points of arrest

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

18. The tensile strength of wrought iron is maximum

Uniform in all directions

Perpendicular to lines of slag distribution

None of the above

Along the lines of slag distribution

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

Cast iron

Cast steel

Admiralty metal

Brass

20. Hematite iron ore contains iron about

45%

55%

70%

30%

Page 3 of 4

21. Taps dies and drills contain carbon

Below 1%

Above 1%

Below 0.5%

Above 2.2%

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

Brittle

Basic

Neutral

Acidic

23. 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%

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

Alpha iron, beta iron and gamma iron

Alpha iron and beta iron

Alpha iron, gamma iron and delta iron

Body centered cubic iron and face centered cubic iron

25. Ductility of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

All of the above

26. Cobalt in steel

Improves cutting ability and reduce hardenability

Gives ductility, toughness, tensile strength and anti corrosion property

Improves wear resistance, cutting ability and toughness

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

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

Silicon

Copper

Nickel

Chromium

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

0.35 to 0.45%

0.04%

0.6 to 0.8%

0.4 to 0.6%

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

Throat

Hearth

Bosh

Stack

30. There are fourteen atoms in a unit cell of

Body centered cubic space lattice

Close packed hexagonal space lattice

None of these

Face centered cubic space lattice

Page 4 of 4

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

Stiffness

Strength

Toughness

Brittleness

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

Duralumin

Hindalium

Magnalium

Y-alloy

33. Brass contains

70% copper and 30% zinc

70 - 75% copper and rest tin

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

90% copper and 10% tin

34. 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

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

Hardenability

Machinability

Formability

Weldability

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

Refine grain structure

Induce stresses

Reduce segregation in casting

Improve mechanical properties

37. 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

38. 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

39. Tungsten in steel

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

Improves cutting ability and reduces hardenability

40. The machinability of steel is improved by adding

Nickel and chromium

Chromium

Sulphur, lead and phosphorus

Nickel

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VideRime

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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