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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 usual composition of a soldering alloy is

Tin, lead and small percentage of antimony

Tin and lead

Tin and copper

Tin, lead and silver

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

Brittle

Neutral

Basic

Acidic

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

50 : 20 : 10 : 20

40 : 30 : 20 : 10

50 : 20 : 20 : 10

30 : 20 : 30 : 20

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

Brass

Cast iron

Admiralty metal

Cast steel

5. The unit cells

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

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

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

B.C.C. crystalline structure

H.C.P. structure

F.C.C. crystal structure

A complex cubic structure

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

Ductility

Plasticity

Brittleness

Malleability

8. The coke in the charge of blast furnace

Controls the grade of pig iron

Supplies heat to reduce ore and melt the iron

Forms a slag by combining with impurities

Acts as an iron bearing mineral

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

Point defect

Surface defect

Line defect

None of these

10. Cobalt in steel

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

Improves cutting ability and reduce hardenability

Gives ductility, toughness, tensile strength and anti corrosion property

Improves wear resistance, cutting ability and toughness

Page 2 of 4

11. Points of arrest for iron correspond to

There is nothing like points of arrest

Stages at which allotropic forms change

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

Stages at which properties do not change with increase in temperature

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

Stiffness

Brittleness

Toughness

Strength

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

Malleability

Plasticity

Elasticity

Ductility

14. Brass contains

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

70 - 75% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

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

Tungsten, chromium, titanium

Chromium, titanium, vanadium

Tungsten, titanium, vanadium

Vanadium, chromium, tungsten

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

Phosphor bronze

Monel metal

White metal

Silicon bronze

17. 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 and beta iron

Alpha iron, beta iron and gamma iron

18. Ductility of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to recover its original form

Ability to undergo large permanent deformations in compression

All of the above

19. 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

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

Toughness

Stiffness

Strength

Brittleness

Page 3 of 4

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

0.20 to 0.45%

0.45 to 0.55%

0.05 to 0.20%

0.55 to 1.0%

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

Hearth

Stack

Throat

Bosh

23. Gamma-iron occurs between the temperature ranges of

900°C to 1400°C

1400°C to 1530°C

600°C to 900°C

400°C to 600°C

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

Reduce segregation in casting

Induce stresses

Improve mechanical properties

Refine grain structure

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

1.2%

2.5 to 4.5%

0.5 to 1%

5 to 7%

26. Taps dies and drills contain carbon

Below 0.5%

Below 1%

Above 1%

Above 2.2%

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

It has good machining properties

It can be forged

It is lighter than pure aluminium

It is prone to age hardening

28. There are fourteen atoms in a unit cell of

Close packed hexagonal space lattice

Body centered cubic space lattice

Face centered cubic space lattice

None of these

29. Cementite consist of

13% carbon and 87% ferrite

13% cementite and 87% ferrite

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

30. Hematite iron ore contains iron about

30%

45%

70%

55%

Page 4 of 4

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

Weldability

Formability

Machinability

Hardenability

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

Silicon

Nickel

Copper

Chromium

33. Corundum contains more than 95%

Steel

Al₂O₃

SiO₂

MgO

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

1500 VPN

600 VPN

250 VPN

1000 to 1100 VPN

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

0.6 to 0.8%

0.35 to 0.45%

0.04%

0.4 to 0.6%

36. The machinability of steel is improved by adding

Chromium

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

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

Y-alloy

Hindalium

Duralumin

Magnalium

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

By crushing into thousands of pieces

In direction perpendicular to application of load

By forming a bulge

By shearing along oblique plane

39. Tungsten in steel

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

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

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

40. The tensile strength of wrought iron is maximum

Uniform in all directions

Along the lines of slag distribution

Perpendicular to lines of slag distribution

None of the above

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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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