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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

1. 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

2. Cobalt in steel

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti corrosion property

Improves cutting ability and reduce hardenability

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

3. 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%

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

Malleability

Elasticity

Ductility

Plasticity

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

It can be forged

It has good machining properties

It is prone to age hardening

It is lighter than pure aluminium

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

Ductility

Brittleness

Plasticity

Malleability

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

Refine grain structure

Induce stresses

Reduce segregation in casting

Improve mechanical properties

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

Y-alloy

Duralumin

Magnalium

Hindalium

9. 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

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

Machinability

Weldability

Formability

Hardenability

Page 2 of 4

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

600 VPN

1000 to 1100 VPN

250 VPN

1500 VPN

12. Taps dies and drills contain carbon

Above 2.2%

Below 1%

Below 0.5%

Above 1%

13. 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

14. 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

15. 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

There is nothing like points of arrest

Stages at which allotropic forms change

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

Neutral

Acidic

Brittle

Basic

17. There are fourteen atoms in a unit cell of

None of these

Face centered cubic space lattice

Close packed hexagonal space lattice

Body centered cubic space lattice

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

By crushing into thousands of pieces

In direction perpendicular to application of load

By shearing along oblique plane

By forming a bulge

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

F.C.C. crystal structure

B.C.C. crystalline structure

H.C.P. structure

A complex cubic structure

20. The tensile strength of wrought iron is maximum

Perpendicular to lines of slag distribution

None of the above

Uniform in all directions

Along the lines of slag distribution

Page 3 of 4

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

Stack

Bosh

Hearth

Throat

22. The machinability of steel is improved by adding

Nickel

Chromium

Nickel and chromium

Sulphur, lead and phosphorus

23. 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%

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

Cast steel

Brass

Admiralty metal

Cast iron

25. Ductility of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to recover its original form

Ability to undergo large permanent deformations in tension

All of the above

26. Cementite consist of

13% ferrite and 87% cementite

13% cementite and 87% ferrite

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

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

0.5 to 1%

1.2%

5 to 7%

2.5 to 4.5%

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

Stiffness

Toughness

Brittleness

Strength

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

Silicon

Chromium

Nickel

Copper

30. 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 cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

Page 4 of 4

31. Brass contains

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin

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

32. 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

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

Toughness

Brittleness

Strength

Stiffness

34. The coke in the charge of blast furnace

Acts as an iron bearing mineral

Supplies heat to reduce ore and melt the iron

Controls the grade of pig iron

Forms a slag by combining with impurities

35. Gamma-iron occurs between the temperature ranges of

400°C to 600°C

1400°C to 1530°C

900°C to 1400°C

600°C to 900°C

36. Hematite iron ore contains iron about

55%

70%

30%

45%

37. 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 : 20 : 10

50 : 20 : 10 : 20

38. 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

39. Corundum contains more than 95%

SiO₂

MgO

Steel

Al₂O₃

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

Silicon bronze

Monel metal

White metal

Phosphor bronze

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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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