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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

1. Taps dies and drills contain carbon

Above 2.2%

Below 0.5%

Above 1%

Below 1%

2. The tensile strength of wrought iron is maximum

Perpendicular to lines of slag distribution

None of the above

Along the lines of slag distribution

Uniform in all directions

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

2.5 to 4.5%

5 to 7%

0.5 to 1%

1.2%

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

40 : 30 : 20 : 10

50 : 20 : 20 : 10

30 : 20 : 30 : 20

50 : 20 : 10 : 20

5. 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

6. The unit cells

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

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

7. Brass contains

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

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin

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

Body centered cubic iron and face centered cubic iron

Alpha iron, beta iron and gamma iron

Alpha iron, gamma iron and delta iron

Alpha iron and beta iron

9. Corundum contains more than 95%

MgO

Steel

SiO₂

Al₂O₃

10. Cementite consist of

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

13% ferrite and 87% cementite

13% cementite and 87% ferrite

Page 2 of 4

11. 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

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

Tungsten, chromium, titanium

Tungsten, titanium, vanadium

Vanadium, chromium, tungsten

Chromium, titanium, vanadium

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

Brittleness

Ductility

Malleability

Plasticity

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

Stack

Throat

Hearth

Bosh

15. Hematite iron ore contains iron about

55%

30%

45%

70%

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

H.C.P. structure

A complex cubic structure

B.C.C. crystalline structure

F.C.C. crystal structure

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

Silicon bronze

Phosphor bronze

Monel metal

White metal

18. 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%

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

Admiralty metal

Cast steel

Cast iron

Brass

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

Plasticity

Ductility

Malleability

Elasticity

Page 3 of 4

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

Toughness

Strength

Brittleness

Stiffness

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

By crushing into thousands of pieces

In direction perpendicular to application of load

By shearing along oblique plane

By forming a bulge

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

Hardenability

Formability

Weldability

Machinability

24. 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

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

Basic

Acidic

Brittle

Neutral

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

Chromium

Nickel

Copper

Silicon

27. Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature

There is nothing like points of arrest

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

Stages at which allotropic forms change

28. 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%

29. The machinability of steel is improved by adding

Nickel

Sulphur, lead and phosphorus

Chromium

Nickel and chromium

30. 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

Page 4 of 4

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

Point defect

Surface defect

None of these

Line defect

32. Tungsten in steel

Improves wear resistance, cutting ability and toughness

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

Improves cutting ability and reduces hardenability

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

33. Cobalt in steel

Gives ductility, toughness, tensile strength and anti corrosion property

Improves cutting ability and reduce hardenability

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

Improves wear resistance, cutting ability and toughness

34. The usual composition of a soldering alloy is

Tin, lead and silver

Tin and lead

Tin and copper

Tin, lead and small percentage of antimony

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

1500 VPN

600 VPN

250 VPN

1000 to 1100 VPN

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

It can be forged

It has good machining properties

It is lighter than pure aluminium

It is prone to age hardening

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

Improve mechanical properties

Refine grain structure

Induce stresses

Reduce segregation in casting

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

Hindalium

Y-alloy

Magnalium

Duralumin

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

Toughness

Strength

Stiffness

Brittleness

40. There are fourteen atoms in a unit cell of

None of these

Close packed hexagonal space lattice

Face centered cubic space lattice

Body centered cubic space lattice

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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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