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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

50 : 20 : 10 : 20

40 : 30 : 20 : 10

50 : 20 : 20 : 10

30 : 20 : 30 : 20

2. 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

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

Toughness

Stiffness

Brittleness

Strength

4. Hematite iron ore contains iron about

30%

70%

55%

45%

5. Taps dies and drills contain carbon

Above 1%

Below 0.5%

Above 2.2%

Below 1%

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

Cast iron

Brass

Cast steel

Admiralty metal

7. 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

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

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

Hearth

Stack

Bosh

Throat

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

It is prone to age hardening

It can be forged

It has good machining properties

It is lighter than pure aluminium

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

Line defect

None of these

Surface defect

Point defect

Page 2 of 4

11. The usual composition of a soldering alloy is

Tin, lead and small percentage of antimony

Tin and lead

Tin, lead and silver

Tin and copper

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

Induce stresses

Reduce segregation in casting

Refine grain structure

Improve mechanical properties

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

Ductility

Brittleness

Plasticity

Malleability

14. Cobalt in steel

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduce hardenability

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

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

Nickel

Copper

Chromium

Silicon

16. 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

17. 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

18. Ductility of a material can be defined as

All of the above

Ability to undergo large permanent deformations in tension

Ability to recover its original form

Ability to undergo large permanent deformations in compression

19. Corundum contains more than 95%

Steel

Al₂O₃

SiO₂

MgO

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

Formability

Hardenability

Machinability

Weldability

Page 3 of 4

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

F.C.C. crystal structure

A complex cubic structure

H.C.P. structure

B.C.C. crystalline structure

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

Stiffness

Brittleness

Strength

Toughness

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

Basic

Neutral

Acidic

Brittle

24. The tensile strength of wrought iron is maximum

Uniform in all directions

None of the above

Along the lines of slag distribution

Perpendicular to lines of slag distribution

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

By shearing along oblique plane

In direction perpendicular to application of load

By crushing into thousands of pieces

By forming a bulge

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

Chromium, titanium, vanadium

Vanadium, chromium, tungsten

Tungsten, titanium, vanadium

Tungsten, chromium, titanium

27. Tungsten in steel

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

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

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

1000 to 1100 VPN

600 VPN

1500 VPN

250 VPN

29. Brass contains

70% copper and 30% zinc

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

90% copper and 10% tin

70 - 75% copper and rest tin

30. The hardness of steel primarily depends on

Percentage of alloying elements

Heat treatment employed

Shape of carbides and their distribution in iron

Percentage of carbon

Page 4 of 4

31. The machinability of steel is improved by adding

Chromium

Nickel and chromium

Nickel

Sulphur, lead and phosphorus

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

Magnalium

Hindalium

Duralumin

Y-alloy

33. 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%

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

Elasticity

Plasticity

Malleability

Ductility

35. The coke in the charge of blast furnace

Forms a slag by combining with impurities

Acts as an iron bearing mineral

Supplies heat to reduce ore and melt the iron

Controls the grade of pig iron

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

5 to 7%

0.5 to 1%

2.5 to 4.5%

1.2%

37. 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

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

0.04%

0.35 to 0.45%

0.4 to 0.6%

0.6 to 0.8%

39. Cementite consist of

13% ferrite and 87% cementite

13% cementite and 87% ferrite

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

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

Monel metal

White metal

Phosphor bronze

Silicon bronze

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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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