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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 and copper

Tin, lead and silver

Tin and lead

Tin, lead and small percentage of antimony

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

Neutral

Brittle

Acidic

Basic

3. The unit cells

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

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

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

0.5 to 1%

5 to 7%

1.2%

2.5 to 4.5%

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

Silicon bronze

White metal

Monel metal

Phosphor bronze

6. 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

There is nothing like points of arrest

Stages at which allotropic forms change

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

Alpha iron, beta iron and gamma iron

Alpha iron and beta iron

Body centered cubic iron and face centered cubic iron

Alpha iron, gamma iron and delta iron

8. Cobalt in steel

Gives ductility, toughness, tensile strength and anti corrosion property

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

9. Ductility of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

All of the above

Ability to recover its original form

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

Plasticity

Malleability

Ductility

Brittleness

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%

0.6 to 0.8%

0.04%

0.35 to 0.45%

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

Stiffness

Toughness

Strength

Brittleness

13. 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

14. Corundum contains more than 95%

Steel

SiO₂

Al₂O₃

MgO

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

Cast iron

Cast steel

Admiralty metal

Brass

16. Taps dies and drills contain carbon

Below 1%

Below 0.5%

Above 2.2%

Above 1%

17. The coke in the charge of blast furnace

Supplies heat to reduce ore and melt the iron

Forms a slag by combining with impurities

Acts as an iron bearing mineral

Controls the grade of pig iron

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

Plasticity

Ductility

Malleability

Elasticity

19. Hematite iron ore contains iron about

45%

30%

55%

70%

20. 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

Page 3 of 4

21. Brass contains

90% copper and 10% tin

70% copper and 30% zinc

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

70 - 75% copper and rest tin

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

Copper

Chromium

Silicon

Nickel

23. Cementite consist of

13% ferrite and 87% cementite

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

13% cementite and 87% ferrite

24. Tungsten in steel

Improves cutting ability and reduces hardenability

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

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

Refine grain structure

Improve mechanical properties

Induce stresses

Reduce segregation in casting

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

Chromium, titanium, vanadium

Tungsten, chromium, titanium

Tungsten, titanium, vanadium

Vanadium, chromium, tungsten

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

In direction perpendicular to application of load

By crushing into thousands of pieces

By shearing along oblique plane

By forming a bulge

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

Duralumin

Magnalium

Hindalium

Y-alloy

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

1000 to 1100 VPN

1500 VPN

250 VPN

600 VPN

30. There are fourteen atoms in a unit cell of

Close packed hexagonal space lattice

Face centered cubic space lattice

Body centered cubic space lattice

None of these

Page 4 of 4

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

Machinability

Formability

Hardenability

Weldability

32. Gamma-iron occurs between the temperature ranges of

400°C to 600°C

900°C to 1400°C

600°C to 900°C

1400°C to 1530°C

33. The machinability of steel is improved by adding

Chromium

Nickel and chromium

Sulphur, lead and phosphorus

Nickel

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

Toughness

Stiffness

Brittleness

Strength

35. 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%

36. The hardness of steel primarily depends on

Percentage of carbon

Percentage of alloying elements

Heat treatment employed

Shape of carbides and their distribution in iron

37. The tensile strength of wrought iron is maximum

Perpendicular to lines of slag distribution

Uniform in all directions

None of the above

Along the lines of slag distribution

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

It has good machining properties

It can be forged

It is prone to age hardening

It is lighter than pure aluminium

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

Throat

Bosh

Hearth

Stack

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

F.C.C. crystal structure

B.C.C. crystalline structure

H.C.P. structure

A complex cubic structure

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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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