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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 unit cells

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

All of the above

2. Corundum contains more than 95%

Steel

Al₂O₃

MgO

SiO₂

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

Acidic

Basic

Neutral

Brittle

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

Stack

Hearth

Bosh

Throat

5. The hardness of steel primarily depends on

Heat treatment employed

Percentage of alloying elements

Percentage of carbon

Shape of carbides and their distribution in iron

6. The machinability of steel is improved by adding

Chromium

Nickel and chromium

Nickel

Sulphur, lead and phosphorus

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

Cast steel

Brass

Admiralty metal

Cast iron

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

Hardenability

Machinability

Weldability

Formability

9. Brass contains

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

70 - 75% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

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

250 VPN

1500 VPN

600 VPN

1000 to 1100 VPN

Page 2 of 4

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

50 : 20 : 20 : 10

30 : 20 : 30 : 20

40 : 30 : 20 : 10

50 : 20 : 10 : 20

12. 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

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

Malleability

Brittleness

Plasticity

Ductility

14. There are fourteen atoms in a unit cell of

None of these

Close packed hexagonal space lattice

Face centered cubic space lattice

Body centered cubic space lattice

15. Points of arrest for iron correspond to

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

Stages at which allotropic forms change

There is nothing like points of arrest

Stages at which properties do not change with increase in temperature

16. 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

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

0.35 to 0.45%

0.4 to 0.6%

0.6 to 0.8%

0.04%

18. 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%

19. Cementite consist of

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

13% carbon and 87% ferrite

20. Taps dies and drills contain carbon

Above 1%

Above 2.2%

Below 0.5%

Below 1%

Page 3 of 4

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

Monel metal

Silicon bronze

Phosphor bronze

White metal

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

0.05 to 0.20%

0.55 to 1.0%

0.45 to 0.55%

0.20 to 0.45%

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

Chromium

Copper

Silicon

Nickel

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

It is prone to age hardening

It has good machining properties

It can be forged

It is lighter than pure aluminium

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

Plasticity

Malleability

Elasticity

Ductility

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

Refine grain structure

Induce stresses

Improve mechanical properties

Reduce segregation in casting

27. Ductility of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

Ability to recover its original form

All of the above

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

Strength

Stiffness

Brittleness

Toughness

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

Point defect

Surface defect

Line defect

None of these

30. The usual composition of a soldering alloy is

Tin, lead and small percentage of antimony

Tin, lead and silver

Tin and lead

Tin and copper

Page 4 of 4

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

By shearing along oblique plane

By crushing into thousands of pieces

In direction perpendicular to application of load

By forming a bulge

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

Alpha iron, gamma iron and delta iron

Alpha iron and beta iron

Alpha iron, beta iron and gamma iron

Body centered cubic iron and face centered cubic iron

33. Tungsten in steel

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

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

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

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

Chromium, titanium, vanadium

Tungsten, titanium, vanadium

Vanadium, chromium, tungsten

Tungsten, chromium, titanium

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

Y-alloy

Magnalium

Hindalium

Duralumin

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

Brittleness

Stiffness

Toughness

Strength

37. Gamma-iron occurs between the temperature ranges of

1400°C to 1530°C

400°C to 600°C

600°C to 900°C

900°C to 1400°C

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

B.C.C. crystalline structure

F.C.C. crystal structure

H.C.P. structure

A complex cubic structure

39. The coke in the charge of blast furnace

Controls the grade of pig iron

Supplies heat to reduce ore and melt the iron

Forms a slag by combining with impurities

Acts as an iron bearing mineral

40. Hematite iron ore contains iron about

45%

55%

70%

30%

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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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