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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 surface hardness of the following order is achieved by nitriding operation

600 VPN

1500 VPN

1000 to 1100 VPN

250 VPN

2. 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

3. The machinability of steel is improved by adding

Nickel and chromium

Chromium

Nickel

Sulphur, lead and phosphorus

4. Hematite iron ore contains iron about

45%

70%

55%

30%

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

Induce stresses

Reduce segregation in casting

Improve mechanical properties

Refine grain structure

6. Cementite consist of

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

13% cementite and 87% ferrite

13% ferrite and 87% cementite

7. There are fourteen atoms in a unit cell of

Close packed hexagonal space lattice

None of these

Face centered cubic space lattice

Body centered cubic space lattice

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

Brittleness

Plasticity

Malleability

Ductility

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

0.5 to 1%

2.5 to 4.5%

1.2%

5 to 7%

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

Duralumin

Y-alloy

Magnalium

Hindalium

Page 2 of 4

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

0.4 to 0.6%

0.04%

0.6 to 0.8%

0.35 to 0.45%

12. 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

13. The usual composition of a soldering alloy is

Tin, lead and silver

Tin, lead and small percentage of antimony

Tin and lead

Tin and copper

14. 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

15. The coke in the charge of blast furnace

Controls the grade of pig iron

Forms a slag by combining with impurities

Acts as an iron bearing mineral

Supplies heat to reduce ore and melt the iron

16. 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

17. Gamma-iron occurs between the temperature ranges of

600°C to 900°C

900°C to 1400°C

1400°C to 1530°C

400°C to 600°C

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

Strength

Brittleness

Toughness

Stiffness

19. Points of arrest for iron correspond to

Stages at which allotropic forms change

Stages at which properties do not change with increase in temperature

There is nothing like points of arrest

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

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

30 : 20 : 30 : 20

50 : 20 : 10 : 20

50 : 20 : 20 : 10

40 : 30 : 20 : 10

Page 3 of 4

21. The hardness of steel primarily depends on

Percentage of alloying elements

Heat treatment employed

Shape of carbides and their distribution in iron

Percentage of carbon

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

None of these

Point defect

Surface defect

Line defect

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

White metal

Monel metal

Phosphor bronze

Silicon bronze

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

Formability

Machinability

Hardenability

Weldability

25. Brass contains

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

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin

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

Chromium

Copper

Silicon

Nickel

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

Throat

Hearth

Stack

Bosh

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

0.20 to 0.45%

0.55 to 1.0%

0.45 to 0.55%

0.05 to 0.20%

29. 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

30. Tungsten in steel

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

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

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

Page 4 of 4

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

Basic

Neutral

Acidic

Brittle

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

Brittleness

Strength

Stiffness

Toughness

33. Taps dies and drills contain carbon

Above 2.2%

Above 1%

Below 0.5%

Below 1%

34. Corundum contains more than 95%

MgO

SiO₂

Steel

Al₂O₃

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

Elasticity

Malleability

Plasticity

Ductility

36. The unit cells

Have the same orientation and their similar faces are parallel

Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal

All of the above

May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice

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

Cast iron

Admiralty metal

Cast steel

Brass

38. Cobalt in steel

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

Gives ductility, toughness, tensile strength and anti corrosion property

39. Ductility of a material can be defined as

All of the above

Ability to undergo large permanent deformations in compression

Ability to recover its original form

Ability to undergo large permanent deformations in tension

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

F.C.C. crystal structure

H.C.P. structure

B.C.C. crystalline structure

A complex cubic structure

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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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