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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

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

H.C.P. structure

F.C.C. crystal structure

B.C.C. crystalline structure

A complex cubic structure

2. Ductility of a material can be defined as

Ability to recover its original form

All of the above

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

3. The usual composition of a soldering alloy is

Tin, lead and small percentage of antimony

Tin and lead

Tin, lead and silver

Tin and copper

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

Stiffness

Strength

Brittleness

Toughness

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

Brittleness

Toughness

Strength

Stiffness

6. Taps dies and drills contain carbon

Below 1%

Below 0.5%

Above 2.2%

Above 1%

7. The hardness of steel primarily depends on

Percentage of carbon

Percentage of alloying elements

Shape of carbides and their distribution in iron

Heat treatment employed

8. 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 wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

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

5 to 7%

2.5 to 4.5%

0.5 to 1%

1.2%

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

Ductility

Brittleness

Malleability

Plasticity

Page 2 of 4

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

Nickel

Chromium

Silicon

Copper

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

Basic

Brittle

Acidic

Neutral

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

Improve mechanical properties

Refine grain structure

Reduce segregation in casting

Induce stresses

14. 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

15. Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature

Stages at which allotropic forms change

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

There is nothing like points of arrest

16. Brass contains

70% copper and 30% zinc

70 - 75% copper and rest tin

90% copper and 10% tin

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

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

By shearing along oblique plane

In direction perpendicular to application of load

By crushing into thousands of pieces

By forming a bulge

18. There are fourteen atoms in a unit cell of

Face centered cubic space lattice

None of these

Close packed hexagonal space lattice

Body centered cubic space lattice

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

Bosh

Stack

Hearth

Throat

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

It is lighter than pure aluminium

It is prone to age hardening

It can be forged

It has good machining properties

Page 3 of 4

21. The machinability of steel is improved by adding

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

Chromium

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

Ductility

Plasticity

Elasticity

Malleability

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

Magnalium

Hindalium

Y-alloy

Duralumin

24. The coke in the charge of blast furnace

Forms a slag by combining with impurities

Supplies heat to reduce ore and melt the iron

Controls the grade of pig iron

Acts as an iron bearing mineral

25. Gamma-iron occurs between the temperature ranges of

600°C to 900°C

1400°C to 1530°C

900°C to 1400°C

400°C to 600°C

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

Admiralty metal

Cast steel

Brass

Cast iron

27. Cobalt in steel

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

Gives ductility, toughness, tensile strength and anti corrosion property

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduce hardenability

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

600 VPN

250 VPN

1000 to 1100 VPN

1500 VPN

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

0.05 to 0.20%

0.20 to 0.45%

0.55 to 1.0%

0.45 to 0.55%

30. 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

Page 4 of 4

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

Alpha iron, beta iron and gamma iron

Alpha iron, gamma iron and delta iron

Body centered cubic iron and face centered cubic iron

Alpha iron and beta iron

32. The unit cells

Have the same orientation and their similar faces are parallel

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

May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice

33. Cementite consist of

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

13% cementite and 87% ferrite

13% ferrite and 87% cementite

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

Phosphor bronze

White metal

Silicon bronze

Monel metal

35. Corundum contains more than 95%

Steel

SiO₂

MgO

Al₂O₃

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

Tungsten, chromium, titanium

Tungsten, titanium, vanadium

Chromium, titanium, vanadium

Vanadium, chromium, tungsten

37. 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%

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

Weldability

Formability

Hardenability

Machinability

39. The tensile strength of wrought iron is maximum

Perpendicular to lines of slag distribution

Uniform in all directions

Along the lines of slag distribution

None of the above

40. Hematite iron ore contains iron about

70%

55%

45%

30%

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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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