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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

1. 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

2. 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

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

Ductility

Malleability

Brittleness

Plasticity

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

30 : 20 : 30 : 20

50 : 20 : 10 : 20

40 : 30 : 20 : 10

50 : 20 : 20 : 10

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

Point defect

Line defect

Surface defect

None of these

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

0.45 to 0.55%

0.20 to 0.45%

0.55 to 1.0%

0.05 to 0.20%

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

Strength

Brittleness

Toughness

Stiffness

8. The usual composition of a soldering alloy is

Tin, lead and small percentage of antimony

Tin and copper

Tin and lead

Tin, lead and silver

9. Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature

Stages at which allotropic forms change

There is nothing like points of arrest

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

10. Cementite consist of

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

13% ferrite and 87% cementite

13% cementite and 87% ferrite

Page 2 of 4

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

Phosphor bronze

Monel metal

White metal

Silicon bronze

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

Hindalium

Y-alloy

Magnalium

Duralumin

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

Alpha iron and beta iron

Alpha iron, gamma iron and delta iron

Alpha iron, beta iron and gamma iron

Body centered cubic iron and face centered cubic iron

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

It is prone to age hardening

It is lighter than pure aluminium

It has good machining properties

It can be forged

15. Hematite iron ore contains iron about

45%

30%

55%

70%

16. The hardness of steel primarily depends on

Shape of carbides and their distribution in iron

Percentage of carbon

Heat treatment employed

Percentage of alloying elements

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

Basic

Neutral

Brittle

Acidic

18. Taps dies and drills contain carbon

Below 1%

Above 2.2%

Above 1%

Below 0.5%

19. There are fourteen atoms in a unit cell of

Face centered cubic space lattice

Close packed hexagonal space lattice

None of these

Body centered cubic space lattice

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

H.C.P. structure

A complex cubic structure

F.C.C. crystal structure

B.C.C. crystalline structure

Page 3 of 4

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

1500 VPN

250 VPN

1000 to 1100 VPN

600 VPN

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

Strength

Toughness

Stiffness

Brittleness

23. The unit cells

Have the same orientation and their similar faces are parallel

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

24. The coke in the charge of blast furnace

Forms a slag by combining with impurities

Controls the grade of pig iron

Acts as an iron bearing mineral

Supplies heat to reduce ore and melt the iron

25. Brass contains

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

90% copper and 10% tin

70% copper and 30% zinc

70 - 75% copper and rest tin

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

Cast iron

Admiralty metal

Brass

Cast steel

27. 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

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

Chromium

Silicon

Nickel

Copper

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

1.2%

2.5 to 4.5%

0.5 to 1%

5 to 7%

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

Induce stresses

Reduce segregation in casting

Refine grain structure

Improve mechanical properties

Page 4 of 4

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

Formability

Machinability

Hardenability

Weldability

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

Tungsten, titanium, vanadium

Tungsten, chromium, titanium

Chromium, titanium, vanadium

Vanadium, chromium, tungsten

33. Cobalt in steel

Improves cutting ability and reduce hardenability

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

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti corrosion property

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

Elasticity

Malleability

Plasticity

Ductility

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

Bosh

Throat

Hearth

Stack

36. Gamma-iron occurs between the temperature ranges of

900°C to 1400°C

400°C to 600°C

1400°C to 1530°C

600°C to 900°C

37. The machinability of steel is improved by adding

Sulphur, lead and phosphorus

Nickel

Nickel and chromium

Chromium

38. The tensile strength of wrought iron is maximum

Along the lines of slag distribution

None of the above

Uniform in all directions

Perpendicular to lines of slag distribution

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

0.6 to 0.8%

0.35 to 0.45%

0.4 to 0.6%

0.04%

40. Corundum contains more than 95%

Al₂O₃

Steel

SiO₂

MgO

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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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