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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

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

0.55 to 1.0%

0.05 to 0.20%

0.45 to 0.55%

0.20 to 0.45%

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

40 : 30 : 20 : 10

50 : 20 : 10 : 20

30 : 20 : 30 : 20

50 : 20 : 20 : 10

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

Body centered cubic iron and face centered cubic iron

Alpha iron, beta iron and gamma iron

Alpha iron and beta iron

Alpha iron, gamma iron and delta iron

4. The coke in the charge of blast furnace

Acts as an iron bearing mineral

Forms a slag by combining with impurities

Controls the grade of pig iron

Supplies heat to reduce ore and melt the iron

5. Gamma-iron occurs between the temperature ranges of

600°C to 900°C

400°C to 600°C

1400°C to 1530°C

900°C to 1400°C

6. 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

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

Weldability

Machinability

Formability

Hardenability

8. 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

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

H.C.P. structure

B.C.C. crystalline structure

A complex cubic structure

F.C.C. crystal structure

10. Cementite consist of

6.67% carbon and 93.33% iron

13% cementite and 87% ferrite

13% carbon and 87% ferrite

13% ferrite and 87% cementite

Page 2 of 4

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

Ductility

Brittleness

Malleability

Plasticity

12. There are fourteen atoms in a unit cell of

None of these

Body centered cubic space lattice

Face centered cubic space lattice

Close packed hexagonal space lattice

13. Points of arrest for iron correspond to

There is nothing like points of arrest

Stages at which allotropic forms change

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

Stages at which properties do not change with increase in temperature

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

Phosphor bronze

Silicon bronze

Monel metal

White metal

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

Stiffness

Strength

Toughness

Brittleness

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

By crushing into thousands of pieces

By shearing along oblique plane

By forming a bulge

In direction perpendicular to application of load

17. The tensile strength of wrought iron is maximum

None of the above

Along the lines of slag distribution

Uniform in all directions

Perpendicular to lines of slag distribution

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

Silicon

Nickel

Copper

Chromium

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

It is prone to age hardening

It has good machining properties

It is lighter than pure aluminium

It can be forged

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

Admiralty metal

Cast iron

Cast steel

Brass

Page 3 of 4

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

Y-alloy

Magnalium

Duralumin

Hindalium

22. Ductility of a material can be defined as

Ability to undergo large permanent deformations in compression

All of the above

Ability to recover its original form

Ability to undergo large permanent deformations in tension

23. Corundum contains more than 95%

SiO₂

MgO

Al₂O₃

Steel

24. Taps dies and drills contain carbon

Above 1%

Above 2.2%

Below 1%

Below 0.5%

25. 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%

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

600 VPN

250 VPN

1500 VPN

1000 to 1100 VPN

27. 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

28. The machinability of steel is improved by adding

Chromium

Nickel and chromium

Sulphur, lead and phosphorus

Nickel

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

Improve mechanical properties

Refine grain structure

Reduce segregation in casting

Induce stresses

30. Hematite iron ore contains iron about

70%

45%

30%

55%

Page 4 of 4

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

Vanadium, chromium, tungsten

Tungsten, titanium, vanadium

Tungsten, chromium, titanium

Chromium, titanium, vanadium

32. 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

33. The unit cells

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

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

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

Brittleness

Strength

Stiffness

Toughness

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

Acidic

Neutral

Brittle

Basic

36. Tungsten in steel

Improves cutting ability and reduces hardenability

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

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

Ductility

Plasticity

Malleability

Elasticity

38. 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

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

Hearth

Throat

Stack

Bosh

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

0.35 to 0.45%

0.6 to 0.8%

0.4 to 0.6%

0.04%

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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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