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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, beta iron and gamma iron

Body centered cubic iron and face centered cubic iron

Alpha iron, gamma iron and delta iron

Alpha iron and beta iron

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

Brittleness

Stiffness

Strength

Toughness

3. Cementite consist of

13% ferrite and 87% cementite

13% carbon and 87% ferrite

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

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

It is lighter than pure aluminium

It can be forged

It is prone to age hardening

It has good machining properties

5. 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

6. 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

7. Brass contains

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

90% copper and 10% tin

70 - 75% copper and rest tin

70% copper and 30% zinc

8. Hematite iron ore contains iron about

55%

45%

70%

30%

9. The machinability of steel is improved by adding

Chromium

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

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

Weldability

Formability

Hardenability

Machinability

Page 2 of 4

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

Bosh

Stack

Throat

Hearth

12. The tensile strength of wrought iron is maximum

Perpendicular to lines of slag distribution

Along the lines of slag distribution

None of the above

Uniform in all directions

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

Magnalium

Duralumin

Y-alloy

Hindalium

14. Taps dies and drills contain carbon

Above 2.2%

Below 1%

Below 0.5%

Above 1%

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

Copper

Chromium

Nickel

Silicon

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

5 to 7%

0.5 to 1%

1.2%

2.5 to 4.5%

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

Reduce segregation in casting

Refine grain structure

Induce stresses

Improve mechanical properties

18. Gamma-iron occurs between the temperature ranges of

400°C to 600°C

900°C to 1400°C

1400°C to 1530°C

600°C to 900°C

19. The usual composition of a soldering alloy is

Tin, lead and silver

Tin and copper

Tin and lead

Tin, lead and small percentage of antimony

20. 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%

0.35 to 0.45%

0.4 to 0.6%

Page 3 of 4

21. The unit cells

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

Have the same orientation and their similar faces are parallel

22. Tungsten in steel

Improves cutting ability and reduces hardenability

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

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

Improves wear resistance, cutting ability and toughness

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

50 : 20 : 20 : 10

50 : 20 : 10 : 20

40 : 30 : 20 : 10

30 : 20 : 30 : 20

24. Corundum contains more than 95%

Al₂O₃

SiO₂

Steel

MgO

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

Stiffness

Toughness

Strength

Brittleness

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

Acidic

Brittle

Neutral

Basic

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

A complex cubic structure

F.C.C. crystal structure

B.C.C. crystalline structure

H.C.P. structure

28. Points of arrest for iron correspond to

There is nothing like points of arrest

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

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

Ductility

Elasticity

Plasticity

Malleability

30. 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

Page 4 of 4

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

By forming a bulge

By crushing into thousands of pieces

In direction perpendicular to application of load

By shearing along oblique plane

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

0.55 to 1.0%

0.20 to 0.45%

0.45 to 0.55%

0.05 to 0.20%

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

250 VPN

600 VPN

1000 to 1100 VPN

1500 VPN

34. Ductility of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to recover its original form

All of the above

Ability to undergo large permanent deformations in tension

35. There are fourteen atoms in a unit cell of

Body centered cubic space lattice

Face centered cubic space lattice

Close packed hexagonal space lattice

None of these

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

Phosphor bronze

Monel metal

Silicon bronze

White metal

37. 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

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

Malleability

Brittleness

Ductility

Plasticity

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

Surface defect

Point defect

Line defect

None of these

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

Cast iron

Cast steel

Admiralty metal

Brass

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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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