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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

Toughness

Stiffness

Brittleness

Strength

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

0.04%

0.4 to 0.6%

0.6 to 0.8%

0.35 to 0.45%

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

Ductility

Elasticity

Plasticity

Malleability

4. Taps dies and drills contain carbon

Above 2.2%

Below 0.5%

Below 1%

Above 1%

5. 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

6. There are fourteen atoms in a unit cell of

None of these

Face centered cubic space lattice

Body centered cubic space lattice

Close packed hexagonal space lattice

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

Stiffness

Brittleness

Toughness

Strength

8. The tensile strength of wrought iron is maximum

Along the lines of slag distribution

Uniform in all directions

Perpendicular to lines of slag distribution

None of the above

9. The machinability of steel is improved by adding

Chromium

Nickel and chromium

Nickel

Sulphur, lead and phosphorus

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

Neutral

Brittle

Acidic

Basic

Page 2 of 4

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

A complex cubic structure

H.C.P. structure

F.C.C. crystal structure

B.C.C. crystalline structure

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

Alpha iron, gamma iron and delta iron

Body centered cubic iron and face centered cubic iron

Alpha iron, beta iron and gamma iron

Alpha iron and beta iron

13. 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

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

Hardenability

Weldability

Machinability

Formability

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

2.5 to 4.5%

5 to 7%

0.5 to 1%

1.2%

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

It has good machining properties

It is prone to age hardening

It can be forged

It is lighter than pure aluminium

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

Cast iron

Cast steel

Brass

Admiralty metal

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

1000 to 1100 VPN

250 VPN

600 VPN

1500 VPN

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

0.55 to 1.0%

0.45 to 0.55%

0.20 to 0.45%

0.05 to 0.20%

20. Corundum contains more than 95%

Al₂O₃

MgO

Steel

SiO₂

Page 3 of 4

21. 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

22. Brass contains

70 - 75% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

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

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

Duralumin

Magnalium

Y-alloy

Hindalium

24. 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

25. Tungsten in steel

Improves cutting ability and reduces hardenability

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

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

Phosphor bronze

White metal

Monel metal

Silicon bronze

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

Stack

Hearth

Throat

Bosh

28. 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

29. Ductility of a material can be defined as

All of the above

Ability to recover its original form

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

30. The coke in the charge of blast furnace

Acts as an iron bearing mineral

Forms a slag by combining with impurities

Supplies heat to reduce ore and melt the iron

Controls the grade of pig iron

Page 4 of 4

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

Ductility

Plasticity

Malleability

Brittleness

32. Points of arrest for iron correspond to

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

Stages at which properties do not change with increase in temperature

Stages at which allotropic forms change

There is nothing like points of arrest

33. 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

34. The hardness of steel primarily depends on

Percentage of carbon

Heat treatment employed

Shape of carbides and their distribution in iron

Percentage of alloying elements

35. Cobalt in steel

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

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduce hardenability

Gives ductility, toughness, tensile strength and anti corrosion property

36. Hematite iron ore contains iron about

30%

55%

45%

70%

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

Copper

Chromium

Silicon

Nickel

38. 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

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

50 : 20 : 10 : 20

50 : 20 : 20 : 10

30 : 20 : 30 : 20

40 : 30 : 20 : 10

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

Improve mechanical properties

Induce stresses

Refine grain structure

Reduce segregation in casting

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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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