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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 coke in the charge of blast furnace

Supplies heat to reduce ore and melt the iron

Forms a slag by combining with impurities

Controls the grade of pig iron

Acts as an iron bearing mineral

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

Silicon

Nickel

Chromium

Copper

3. Brass contains

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin

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

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

Hindalium

Duralumin

Y-alloy

Magnalium

5. There are fourteen atoms in a unit cell of

Close packed hexagonal space lattice

Body centered cubic space lattice

None of these

Face centered cubic space lattice

6. 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

7. Ductility of a material can be defined as

Ability to undergo large permanent deformations in tension

All of the above

Ability to undergo large permanent deformations in compression

Ability to recover its original form

8. Cobalt in steel

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

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduce hardenability

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

Malleability

Ductility

Brittleness

Plasticity

10. The usual composition of a soldering alloy is

Tin, lead and small percentage of antimony

Tin, lead and silver

Tin and lead

Tin and copper

Page 2 of 4

11. 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

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

250 VPN

600 VPN

1000 to 1100 VPN

1500 VPN

13. 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

14. The machinability of steel is improved by adding

Nickel

Chromium

Nickel and chromium

Sulphur, lead and phosphorus

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

It is lighter than pure aluminium

It has good machining properties

It can be forged

It is prone to age hardening

16. 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

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

Ductility

Elasticity

Plasticity

Malleability

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

Silicon bronze

Phosphor bronze

White metal

Monel metal

19. Gamma-iron occurs between the temperature ranges of

1400°C to 1530°C

900°C to 1400°C

400°C to 600°C

600°C to 900°C

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

Brittleness

Strength

Stiffness

Toughness

Page 3 of 4

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

1.2%

5 to 7%

0.5 to 1%

2.5 to 4.5%

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

0.04%

0.6 to 0.8%

0.35 to 0.45%

0.4 to 0.6%

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

Stack

Hearth

Bosh

Throat

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

Stiffness

Strength

Brittleness

Toughness

25. Points of arrest for iron correspond to

Stages at which allotropic forms change

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

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

Alpha iron and beta iron

Body centered cubic iron and face centered cubic iron

Alpha iron, gamma iron and delta iron

Alpha iron, beta iron and gamma iron

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

50 : 20 : 20 : 10

30 : 20 : 30 : 20

40 : 30 : 20 : 10

50 : 20 : 10 : 20

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

Reduce segregation in casting

Refine grain structure

Induce stresses

Improve mechanical properties

29. Hematite iron ore contains iron about

30%

70%

55%

45%

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

Brass

Cast iron

Admiralty metal

Cast steel

Page 4 of 4

31. Tungsten in steel

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

Improves cutting ability and reduces hardenability

32. Cementite consist of

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

13% cementite and 87% ferrite

13% carbon and 87% ferrite

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

0.55 to 1.0%

0.05 to 0.20%

0.20 to 0.45%

0.45 to 0.55%

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

By crushing into thousands of pieces

By forming a bulge

In direction perpendicular to application of load

By shearing along oblique plane

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

Point defect

Surface defect

None of these

Line defect

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

Acidic

Basic

Brittle

Neutral

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

Machinability

Formability

Weldability

Hardenability

38. Corundum contains more than 95%

Al₂O₃

MgO

SiO₂

Steel

39. Taps dies and drills contain carbon

Below 0.5%

Above 1%

Below 1%

Above 2.2%

40. The hardness of steel primarily depends on

Heat treatment employed

Shape of carbides and their distribution in iron

Percentage of alloying elements

Percentage of carbon

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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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