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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

1. Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature

Stages at which allotropic forms change

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

There is nothing like points of arrest

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

Throat

Hearth

Bosh

Stack

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

0.5 to 1%

5 to 7%

2.5 to 4.5%

1.2%

4. There are fourteen atoms in a unit cell of

Face centered cubic space lattice

Body centered cubic space lattice

Close packed hexagonal space lattice

None of these

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

Plasticity

Ductility

Malleability

Brittleness

6. Taps dies and drills contain carbon

Above 1%

Above 2.2%

Below 1%

Below 0.5%

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

Basic

Neutral

Brittle

Acidic

8. Corundum contains more than 95%

MgO

Steel

Al₂O₃

SiO₂

9. 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

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

Nickel

Copper

Silicon

Chromium

Page 2 of 4

11. The unit cells

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

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

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

Toughness

Strength

Brittleness

Stiffness

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

0.6 to 0.8%

0.4 to 0.6%

0.35 to 0.45%

0.04%

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

Vanadium, chromium, tungsten

Tungsten, chromium, titanium

Tungsten, titanium, vanadium

Chromium, titanium, vanadium

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

Refine grain structure

Improve mechanical properties

Reduce segregation in casting

Induce stresses

16. Hematite iron ore contains iron about

70%

55%

30%

45%

17. The tensile strength of wrought iron is maximum

Uniform in all directions

Along the lines of slag distribution

None of the above

Perpendicular to lines of slag distribution

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

0.20 to 0.45%

0.05 to 0.20%

0.45 to 0.55%

0.55 to 1.0%

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

50 : 20 : 20 : 10

50 : 20 : 10 : 20

40 : 30 : 20 : 10

30 : 20 : 30 : 20

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

Alpha iron and beta iron

Alpha iron, beta iron and gamma iron

Body centered cubic iron and face centered cubic iron

Alpha iron, gamma iron and delta iron

Page 3 of 4

21. The coke in the charge of blast furnace

Acts as an iron bearing mineral

Forms a slag by combining with impurities

Controls the grade of pig iron

Supplies heat to reduce ore and melt the iron

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

Toughness

Brittleness

Strength

Stiffness

23. Ductility of a material can be defined as

Ability to undergo large permanent deformations in compression

Ability to recover its original form

All of the above

Ability to undergo large permanent deformations in tension

24. 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

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

None of these

Point defect

Surface defect

Line defect

26. The hardness of steel primarily depends on

Shape of carbides and their distribution in iron

Heat treatment employed

Percentage of alloying elements

Percentage of carbon

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

Brass

Cast steel

Cast iron

Admiralty metal

28. Gamma-iron occurs between the temperature ranges of

400°C to 600°C

1400°C to 1530°C

900°C to 1400°C

600°C to 900°C

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

White metal

Silicon bronze

Monel metal

Phosphor bronze

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

Elasticity

Malleability

Plasticity

Ductility

Page 4 of 4

31. 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

32. The usual composition of a soldering alloy is

Tin, lead and silver

Tin and copper

Tin, lead and small percentage of antimony

Tin and lead

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

In direction perpendicular to application of load

By shearing along oblique plane

By forming a bulge

By crushing into thousands of pieces

34. Cementite consist of

13% carbon and 87% ferrite

13% cementite and 87% ferrite

13% ferrite and 87% cementite

6.67% carbon and 93.33% iron

35. Cobalt in steel

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

Improves wear resistance, cutting ability and toughness

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

Hardenability

Machinability

Formability

Weldability

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

1500 VPN

600 VPN

1000 to 1100 VPN

250 VPN

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

Y-alloy

Duralumin

Hindalium

Magnalium

39. The machinability of steel is improved by adding

Chromium

Nickel

Nickel and chromium

Sulphur, lead and phosphorus

40. 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

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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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