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Engineering Materials
0

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

Brittleness

Toughness

Strength

Stiffness

2. Points of arrest for iron correspond to

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

There is nothing like points of arrest

3. Hematite iron ore contains iron about

55%

30%

45%

70%

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

Line defect

None of these

Surface defect

Point defect

5. There are fourteen atoms in a unit cell of

Close packed hexagonal space lattice

Face centered cubic space lattice

Body centered cubic space lattice

None of these

6. 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

7. Brass contains

90% copper and 10% tin

70% copper and 30% zinc

70 - 75% copper and rest tin

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

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

Malleability

Ductility

Brittleness

Plasticity

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

0.5 to 1%

5 to 7%

2.5 to 4.5%

1.2%

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

Improve mechanical properties

Induce stresses

Refine grain structure

Reduce segregation in casting

Page 2 of 4

11. The coke in the charge of blast furnace

Controls the grade of pig iron

Supplies heat to reduce ore and melt the iron

Acts as an iron bearing mineral

Forms a slag by combining with impurities

12. The tensile strength of wrought iron is maximum

None of the above

Along the lines of slag distribution

Perpendicular to lines of slag distribution

Uniform in all directions

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

Alpha iron, gamma iron and delta iron

Alpha iron, beta iron and gamma iron

Body centered cubic iron and face centered cubic iron

Alpha iron and beta iron

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

0.4 to 0.6%

0.35 to 0.45%

0.6 to 0.8%

0.04%

15. The machinability of steel is improved by adding

Sulphur, lead and phosphorus

Chromium

Nickel

Nickel and chromium

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

Brass

Admiralty metal

Cast iron

Cast steel

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

Weldability

Hardenability

Formability

Machinability

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

Basic

Neutral

Brittle

Acidic

19. 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

20. 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

Page 3 of 4

21. 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

22. Ductility of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

All of the above

23. Tungsten in steel

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

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

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

24. The usual composition of a soldering alloy is

Tin, lead and silver

Tin and copper

Tin and lead

Tin, lead and small percentage of antimony

25. 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

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

40 : 30 : 20 : 10

30 : 20 : 30 : 20

50 : 20 : 10 : 20

50 : 20 : 20 : 10

27. 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

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

Silicon

Nickel

Copper

Chromium

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

White metal

Monel metal

Silicon bronze

Phosphor bronze

30. Taps dies and drills contain carbon

Below 1%

Above 1%

Above 2.2%

Below 0.5%

Page 4 of 4

31. The hardness of steel primarily depends on

Percentage of carbon

Shape of carbides and their distribution in iron

Heat treatment employed

Percentage of alloying elements

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

Hearth

Stack

Throat

Bosh

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

Ductility

Plasticity

Malleability

Elasticity

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

Tungsten, chromium, titanium

Vanadium, chromium, tungsten

Tungsten, titanium, vanadium

Chromium, titanium, vanadium

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

0.05 to 0.20%

0.55 to 1.0%

0.20 to 0.45%

0.45 to 0.55%

36. Corundum contains more than 95%

Steel

Al₂O₃

SiO₂

MgO

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

Strength

Stiffness

Toughness

Brittleness

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

600 VPN

1500 VPN

1000 to 1100 VPN

250 VPN

39. Cementite consist of

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

13% cementite and 87% ferrite

13% ferrite and 87% cementite

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

Duralumin

Hindalium

Magnalium

Y-alloy

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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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