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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. The coke in the charge of blast furnace

Forms a slag by combining with impurities

Supplies heat to reduce ore and melt the iron

Controls the grade of pig iron

Acts as an iron bearing mineral

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

Refine grain structure

Reduce segregation in casting

Improve mechanical properties

Induce stresses

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

White metal

Silicon bronze

Phosphor bronze

Monel metal

5. Tungsten in steel

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

Improves wear resistance, cutting ability and toughness

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

Improves cutting ability and reduces hardenability

6. 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

7. The usual composition of a soldering alloy is

Tin, lead and small percentage of antimony

Tin and copper

Tin, lead and silver

Tin and lead

8. Cementite consist of

13% ferrite and 87% cementite

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

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

Throat

Bosh

Stack

Hearth

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

Hardenability

Weldability

Formability

Machinability

Page 2 of 4

11. Hematite iron ore contains iron about

55%

45%

30%

70%

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

Ductility

Brittleness

Malleability

Plasticity

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

Acidic

Brittle

Basic

Neutral

14. The machinability of steel is improved by adding

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

Chromium

15. The hardness of steel primarily depends on

Percentage of alloying elements

Percentage of carbon

Shape of carbides and their distribution in iron

Heat treatment employed

16. Ductility of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in compression

All of the above

Ability to undergo large permanent deformations in tension

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

2.5 to 4.5%

1.2%

5 to 7%

0.5 to 1%

18. The unit cells

Have the same orientation and their similar faces are parallel

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

All of the above

19. Taps dies and drills contain carbon

Below 1%

Above 1%

Below 0.5%

Above 2.2%

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

B.C.C. crystalline structure

A complex cubic structure

H.C.P. structure

F.C.C. crystal structure

Page 3 of 4

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

By crushing into thousands of pieces

In direction perpendicular to application of load

By shearing along oblique plane

By forming a bulge

22. Corundum contains more than 95%

MgO

Steel

Al₂O₃

SiO₂

23. Points of arrest for iron correspond to

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

Stages at which properties do not change with increase in temperature

Stages at which allotropic forms change

There is nothing like points of arrest

24. 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

25. 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

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

0.4 to 0.6%

0.35 to 0.45%

0.6 to 0.8%

0.04%

27. 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

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

Copper

Chromium

Silicon

Nickel

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

Toughness

Stiffness

Brittleness

Strength

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

Tungsten, titanium, vanadium

Tungsten, chromium, titanium

Vanadium, chromium, tungsten

Chromium, titanium, vanadium

Page 4 of 4

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

1500 VPN

600 VPN

250 VPN

1000 to 1100 VPN

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

Elasticity

Plasticity

Malleability

Ductility

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

It can be forged

It is prone to age hardening

It has good machining properties

It is lighter than pure aluminium

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

Hindalium

Y-alloy

Duralumin

Magnalium

35. Brass contains

70 - 75% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

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

36. Gamma-iron occurs between the temperature ranges of

1400°C to 1530°C

600°C to 900°C

400°C to 600°C

900°C to 1400°C

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

0.45 to 0.55%

0.55 to 1.0%

0.20 to 0.45%

0.05 to 0.20%

38. Cobalt in steel

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduce hardenability

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

Cast iron

Brass

Cast steel

Admiralty metal

40. There are fourteen atoms in a unit cell of

Body centered cubic space lattice

None of these

Face centered cubic space lattice

Close packed hexagonal space lattice

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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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