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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

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

30 : 20 : 30 : 20

40 : 30 : 20 : 10

50 : 20 : 20 : 10

50 : 20 : 10 : 20

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

Neutral

Acidic

Brittle

Basic

3. Ductility of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

Ability to recover its original form

All of the above

4. Taps dies and drills contain carbon

Below 0.5%

Below 1%

Above 2.2%

Above 1%

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

None of these

Line defect

Point defect

Surface defect

6. Gamma-iron occurs between the temperature ranges of

1400°C to 1530°C

600°C to 900°C

900°C to 1400°C

400°C to 600°C

7. Hematite iron ore contains iron about

55%

70%

30%

45%

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

Stiffness

Brittleness

Strength

Toughness

9. 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%

10. 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

Page 2 of 4

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

Silicon

Copper

Nickel

Chromium

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

Phosphor bronze

White metal

Monel metal

Silicon bronze

13. 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

14. The usual composition of a soldering alloy is

Tin, lead and silver

Tin, lead and small percentage of antimony

Tin and lead

Tin and copper

15. The machinability of steel is improved by adding

Sulphur, lead and phosphorus

Nickel and chromium

Nickel

Chromium

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

Reduce segregation in casting

Refine grain structure

Induce stresses

Improve mechanical properties

17. Cobalt in steel

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti corrosion property

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

Improves cutting ability and reduce hardenability

18. Tungsten in steel

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

Improves wear resistance, cutting ability and toughness

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

Machinability

Formability

Hardenability

Weldability

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

0.5 to 1%

1.2%

5 to 7%

2.5 to 4.5%

Page 3 of 4

21. Points of arrest for iron correspond to

Stages at which allotropic forms change

There is nothing like points of arrest

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

Stages at which properties do not change with increase in temperature

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

Chromium, titanium, vanadium

Tungsten, chromium, titanium

Vanadium, chromium, tungsten

Tungsten, titanium, vanadium

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

Brass

Admiralty metal

Cast steel

Cast iron

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

Hearth

Throat

Stack

Bosh

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

Stiffness

Strength

Brittleness

Toughness

26. 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

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

Hindalium

Duralumin

Y-alloy

Magnalium

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

Plasticity

Elasticity

Malleability

Ductility

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

0.35 to 0.45%

0.04%

0.6 to 0.8%

0.4 to 0.6%

30. There are fourteen atoms in a unit cell of

None of these

Face centered cubic space lattice

Body centered cubic space lattice

Close packed hexagonal space lattice

Page 4 of 4

31. Brass contains

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

90% copper and 10% tin

70 - 75% copper and rest tin

70% copper and 30% zinc

32. 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

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

Malleability

Ductility

Plasticity

Brittleness

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

In direction perpendicular to application of load

By crushing into thousands of pieces

By forming a bulge

By shearing along oblique plane

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

Alpha iron and beta iron

Alpha iron, beta iron and gamma iron

Alpha iron, gamma iron and delta iron

Body centered cubic iron and face centered cubic iron

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

600 VPN

250 VPN

1000 to 1100 VPN

1500 VPN

37. 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

Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal

Have the same orientation and their similar faces are parallel

38. The coke in the charge of blast furnace

Controls the grade of pig iron

Forms a slag by combining with impurities

Acts as an iron bearing mineral

Supplies heat to reduce ore and melt the iron

39. The hardness of steel primarily depends on

Percentage of carbon

Percentage of alloying elements

Shape of carbides and their distribution in iron

Heat treatment employed

40. Corundum contains more than 95%

SiO₂

Al₂O₃

MgO

Steel

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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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