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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

B.C.C. crystalline structure

A complex cubic structure

F.C.C. crystal structure

H.C.P. structure

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

50 : 20 : 20 : 10

40 : 30 : 20 : 10

30 : 20 : 30 : 20

50 : 20 : 10 : 20

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

Brass

Admiralty metal

Cast iron

Cast steel

4. 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

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

Y-alloy

Duralumin

Magnalium

Hindalium

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

In direction perpendicular to application of load

By forming a bulge

By shearing along oblique plane

By crushing into thousands of pieces

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

Vanadium, chromium, tungsten

Tungsten, titanium, vanadium

Chromium, titanium, vanadium

Tungsten, chromium, titanium

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

0.45 to 0.55%

0.05 to 0.20%

0.55 to 1.0%

0.20 to 0.45%

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

Induce stresses

Improve mechanical properties

Reduce segregation in casting

Refine grain structure

10. 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

Page 2 of 4

11. The unit cells

All of the above

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

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

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

0.6 to 0.8%

0.4 to 0.6%

0.35 to 0.45%

0.04%

13. Taps dies and drills contain carbon

Below 0.5%

Above 1%

Above 2.2%

Below 1%

14. Corundum contains more than 95%

MgO

Al₂O₃

Steel

SiO₂

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

Toughness

Brittleness

Strength

Stiffness

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

Plasticity

Ductility

Brittleness

Malleability

17. The hardness of steel primarily depends on

Shape of carbides and their distribution in iron

Percentage of alloying elements

Heat treatment employed

Percentage of carbon

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

Alpha iron and beta iron

Alpha iron, beta iron and gamma iron

Body centered cubic iron and face centered cubic iron

Alpha iron, gamma iron and delta iron

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

Strength

Toughness

Stiffness

Brittleness

20. Tungsten in steel

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

Improves cutting ability and reduces hardenability

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

Improves wear resistance, cutting ability and toughness

Page 3 of 4

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

Silicon

Copper

Nickel

Chromium

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

1500 VPN

600 VPN

250 VPN

1000 to 1100 VPN

23. The tensile strength of wrought iron is maximum

Along the lines of slag distribution

Perpendicular to lines of slag distribution

Uniform in all directions

None of the above

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

5 to 7%

1.2%

2.5 to 4.5%

0.5 to 1%

25. Cobalt in steel

Gives ductility, toughness, tensile strength and anti corrosion property

Improves cutting ability and reduce hardenability

Improves wear resistance, cutting ability and toughness

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

26. 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

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

Hardenability

Formability

Weldability

Machinability

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

Silicon bronze

Monel metal

Phosphor bronze

White metal

29. 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

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

Plasticity

Malleability

Ductility

Elasticity

Page 4 of 4

31. 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

32. There are fourteen atoms in a unit cell of

Face centered cubic space lattice

Close packed hexagonal space lattice

Body centered cubic space lattice

None of these

33. Hematite iron ore contains iron about

55%

45%

70%

30%

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

Stack

Throat

Bosh

Hearth

35. The usual composition of a soldering alloy is

Tin and copper

Tin, lead and small percentage of antimony

Tin, lead and silver

Tin and lead

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

None of these

Point defect

Line defect

Surface defect

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

Brittle

Acidic

Basic

Neutral

38. Cementite consist of

13% ferrite and 87% cementite

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

13% cementite and 87% ferrite

39. Points of arrest for iron correspond to

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

Stages at which allotropic forms change

40. The machinability of steel is improved by adding

Chromium

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

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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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