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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

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

13% carbon and 87% ferrite

13% cementite and 87% ferrite

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

600 VPN

1500 VPN

1000 to 1100 VPN

250 VPN

3. The hardness of steel primarily depends on

Percentage of alloying elements

Percentage of carbon

Heat treatment employed

Shape of carbides and their distribution in iron

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

Plasticity

Elasticity

Malleability

Ductility

5. The usual composition of a soldering alloy is

Tin, lead and small percentage of antimony

Tin and copper

Tin and lead

Tin, lead and silver

6. 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%

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

Stiffness

Brittleness

Strength

Toughness

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

Copper

Nickel

Chromium

Silicon

9. Cobalt in steel

Improves cutting ability and reduce hardenability

Gives ductility, toughness, tensile strength and anti corrosion property

Improves wear resistance, cutting ability and toughness

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

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

Toughness

Stiffness

Strength

Brittleness

Page 2 of 4

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

Alpha iron, gamma iron and delta iron

Alpha iron, beta iron and gamma iron

Body centered cubic iron and face centered cubic iron

Alpha iron and beta iron

12. Gamma-iron occurs between the temperature ranges of

1400°C to 1530°C

900°C to 1400°C

600°C to 900°C

400°C to 600°C

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

30 : 20 : 30 : 20

50 : 20 : 20 : 10

50 : 20 : 10 : 20

40 : 30 : 20 : 10

14. The tensile strength of wrought iron is maximum

None of the above

Uniform in all directions

Perpendicular to lines of slag distribution

Along the lines of slag distribution

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

0.05 to 0.20%

0.20 to 0.45%

0.45 to 0.55%

0.55 to 1.0%

16. The unit cells

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

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

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

Silicon bronze

Monel metal

White metal

Phosphor bronze

18. There are fourteen atoms in a unit cell of

Body centered cubic space lattice

None of these

Close packed hexagonal space lattice

Face centered cubic space lattice

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

Stack

Hearth

Throat

Bosh

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

Brass

Admiralty metal

Cast iron

Cast steel

Page 3 of 4

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

Duralumin

Hindalium

Magnalium

Y-alloy

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

Plasticity

Malleability

Ductility

Brittleness

23. Points of arrest for iron correspond to

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

There is nothing like points of arrest

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

Hardenability

Formability

Machinability

Weldability

25. Brass contains

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

70 - 75% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

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

Basic

Brittle

Acidic

Neutral

27. The machinability of steel is improved by adding

Sulphur, lead and phosphorus

Chromium

Nickel

Nickel and chromium

28. 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

29. Corundum contains more than 95%

MgO

Steel

Al₂O₃

SiO₂

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

It is prone to age hardening

It can be forged

It has good machining properties

It is lighter than pure aluminium

Page 4 of 4

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

0.04%

0.35 to 0.45%

0.6 to 0.8%

0.4 to 0.6%

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

In direction perpendicular to application of load

By forming a bulge

By shearing along oblique plane

By crushing into thousands of pieces

33. Ductility of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in tension

All of the above

Ability to undergo large permanent deformations in compression

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

Induce stresses

Reduce segregation in casting

Improve mechanical properties

Refine grain structure

35. Taps dies and drills contain carbon

Below 1%

Below 0.5%

Above 2.2%

Above 1%

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

Surface defect

Line defect

None of these

Point defect

37. Hematite iron ore contains iron about

45%

70%

55%

30%

38. Tungsten in steel

Improves wear resistance, cutting ability and toughness

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

Improves cutting ability and reduces hardenability

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

39. The coke in the charge of blast furnace

Supplies heat to reduce ore and melt the iron

Acts as an iron bearing mineral

Controls the grade of pig iron

Forms a slag by combining with impurities

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

Tungsten, chromium, titanium

Vanadium, chromium, tungsten

Chromium, titanium, vanadium

Tungsten, titanium, vanadium

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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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