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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 property is desirable in parts subjected to shock and impact loads?

Strength

Toughness

Brittleness

Stiffness

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

Admiralty metal

Brass

Cast steel

Cast iron

3. The hardness of steel primarily depends on

Shape of carbides and their distribution in iron

Percentage of carbon

Percentage of alloying elements

Heat treatment employed

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

Monel metal

Silicon bronze

Phosphor bronze

White metal

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

Ductility

Malleability

Plasticity

Brittleness

6. Tungsten in steel

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

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

7. The unit cells

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

All of the above

Have the same orientation and their similar faces are parallel

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

Toughness

Stiffness

Strength

Brittleness

9. The usual composition of a soldering alloy is

Tin, lead and silver

Tin, lead and small percentage of antimony

Tin and copper

Tin and lead

10. Corundum contains more than 95%

Al₂O₃

SiO₂

MgO

Steel

Page 2 of 4

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

Refine grain structure

Reduce segregation in casting

Induce stresses

Improve mechanical properties

12. 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

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

A complex cubic structure

H.C.P. structure

B.C.C. crystalline structure

F.C.C. crystal structure

14. 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

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

Stack

Hearth

Throat

Bosh

16. The tensile strength of wrought iron is maximum

None of the above

Along the lines of slag distribution

Uniform in all directions

Perpendicular to lines of slag distribution

17. 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

18. The machinability of steel is improved by adding

Chromium

Sulphur, lead and phosphorus

Nickel

Nickel and chromium

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

0.6 to 0.8%

0.4 to 0.6%

0.35 to 0.45%

0.04%

20. The coke in the charge of blast furnace

Controls the grade of pig iron

Acts as an iron bearing mineral

Supplies heat to reduce ore and melt the iron

Forms a slag by combining with impurities

Page 3 of 4

21. Gamma-iron occurs between the temperature ranges of

1400°C to 1530°C

600°C to 900°C

900°C to 1400°C

400°C to 600°C

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

Hindalium

Duralumin

Magnalium

Y-alloy

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

40 : 30 : 20 : 10

50 : 20 : 10 : 20

50 : 20 : 20 : 10

30 : 20 : 30 : 20

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

Hardenability

Weldability

Machinability

Formability

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

Neutral

Acidic

Basic

Brittle

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

Chromium, titanium, vanadium

Tungsten, titanium, vanadium

Tungsten, chromium, titanium

Vanadium, chromium, tungsten

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

Alpha iron, beta iron and gamma iron

Alpha iron, gamma iron and delta iron

Alpha iron and beta iron

Body centered cubic iron and face centered cubic iron

28. Points of arrest for iron correspond to

There is nothing like points of arrest

Stages at which properties do not change with increase in temperature

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

Stages at which allotropic forms change

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

By forming a bulge

By shearing along oblique plane

In direction perpendicular to application of load

By crushing into thousands of pieces

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

Surface defect

None of these

Line defect

Point defect

Page 4 of 4

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

Malleability

Ductility

Elasticity

Plasticity

32. Hematite iron ore contains iron about

55%

30%

45%

70%

33. 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

34. 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%

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

0.45 to 0.55%

0.05 to 0.20%

0.20 to 0.45%

0.55 to 1.0%

36. 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

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

It has good machining properties

It can be forged

It is prone to age hardening

It is lighter than pure aluminium

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

1500 VPN

1000 to 1100 VPN

600 VPN

250 VPN

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

Chromium

Copper

Silicon

Nickel

40. Taps dies and drills contain carbon

Above 1%

Below 1%

Below 0.5%

Above 2.2%

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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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