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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

1. Cementite consist of

13% ferrite and 87% cementite

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

13% cementite and 87% ferrite

2. Hematite iron ore contains iron about

55%

30%

70%

45%

3. The coke in the charge of blast furnace

Supplies heat to reduce ore and melt the iron

Controls the grade of pig iron

Forms a slag by combining with impurities

Acts as an iron bearing mineral

4. There are fourteen atoms in a unit cell of

Body centered cubic space lattice

Face centered cubic space lattice

None of these

Close packed hexagonal space lattice

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

Strength

Stiffness

Brittleness

Toughness

6. Gamma-iron occurs between the temperature ranges of

400°C to 600°C

600°C to 900°C

1400°C to 1530°C

900°C to 1400°C

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

Duralumin

Hindalium

Magnalium

Y-alloy

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

Silicon bronze

Phosphor bronze

White metal

Monel metal

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

Strength

Stiffness

Brittleness

Toughness

10. The unit cells

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

Have the same orientation and their similar faces are parallel

Page 2 of 4

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

Body centered cubic iron and face centered cubic iron

Alpha iron, gamma iron and delta iron

Alpha iron, beta iron and gamma iron

Alpha iron and beta iron

12. 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

50 : 20 : 10 : 20

30 : 20 : 30 : 20

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

In direction perpendicular to application of load

By shearing along oblique plane

By crushing into thousands of pieces

By forming a bulge

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

Silicon

Chromium

Nickel

Copper

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

600 VPN

1500 VPN

1000 to 1100 VPN

250 VPN

16. The machinability of steel is improved by adding

Nickel

Sulphur, lead and phosphorus

Nickel and chromium

Chromium

17. Corundum contains more than 95%

MgO

Al₂O₃

SiO₂

Steel

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

Reduce segregation in casting

Refine grain structure

Improve mechanical properties

Induce stresses

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

None of these

Surface defect

Line defect

Point defect

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

Neutral

Brittle

Basic

Acidic

Page 3 of 4

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

Cast steel

Admiralty metal

Brass

Cast iron

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

Ductility

Plasticity

Malleability

Elasticity

23. Points of arrest for iron correspond to

Stages at which allotropic forms change

Stages at which properties do not change with increase in temperature

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

There is nothing like points of arrest

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

2.5 to 4.5%

1.2%

0.5 to 1%

5 to 7%

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

0.20 to 0.45%

0.05 to 0.20%

0.45 to 0.55%

0.55 to 1.0%

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

0.6 to 0.8%

0.04%

0.4 to 0.6%

0.35 to 0.45%

27. Taps dies and drills contain carbon

Below 1%

Above 2.2%

Above 1%

Below 0.5%

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

Weldability

Hardenability

Machinability

Formability

29. Cobalt in steel

Gives ductility, toughness, tensile strength and anti corrosion property

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

Improves cutting ability and reduce hardenability

Improves wear resistance, cutting ability and toughness

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

It can be forged

It has good machining properties

It is lighter than pure aluminium

It is prone to age hardening

Page 4 of 4

31. 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

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

Ductility

Brittleness

Malleability

Plasticity

33. Ductility of a material can be defined as

Ability to undergo large permanent deformations in compression

All of the above

Ability to undergo large permanent deformations in tension

Ability to recover its original form

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

Tungsten, titanium, vanadium

Chromium, titanium, vanadium

Vanadium, chromium, tungsten

Tungsten, chromium, titanium

35. The hardness of steel primarily depends on

Percentage of carbon

Heat treatment employed

Percentage of alloying elements

Shape of carbides and their distribution in iron

36. 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

37. The tensile strength of wrought iron is maximum

Uniform in all directions

Perpendicular to lines of slag distribution

Along the lines of slag distribution

None of the above

38. Brass contains

70% copper and 30% zinc

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

70 - 75% copper and rest tin

90% copper and 10% tin

39. The usual composition of a soldering alloy is

Tin, lead and small percentage of antimony

Tin, lead and silver

Tin and copper

Tin and lead

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

Stack

Throat

Bosh

Hearth

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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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