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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

1. Gamma-iron occurs between the temperature ranges of

900°C to 1400°C

1400°C to 1530°C

600°C to 900°C

400°C to 600°C

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

Brass

Cast iron

Cast steel

Admiralty metal

3. Points of arrest for iron correspond to

Stages at which allotropic forms change

There is nothing like points of arrest

Stages at which properties do not change with increase in temperature

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

4. 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

5. 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

6. The unit cells

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

All of the above

Have the same orientation and their similar faces are parallel

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

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

Stiffness

Strength

Toughness

Brittleness

8. Corundum contains more than 95%

SiO₂

Al₂O₃

Steel

MgO

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

Hindalium

Duralumin

Y-alloy

Magnalium

10. 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

Page 2 of 4

11. The machinability of steel is improved by adding

Chromium

Sulphur, lead and phosphorus

Nickel and chromium

Nickel

12. 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

13. The tensile strength of wrought iron is maximum

Perpendicular to lines of slag distribution

None of the above

Uniform in all directions

Along the lines of slag distribution

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

1.2%

2.5 to 4.5%

5 to 7%

0.5 to 1%

15. Brass contains

70% copper and 30% zinc

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

70 - 75% copper and rest tin

90% copper and 10% tin

16. 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 and beta iron

Alpha iron, gamma iron and delta iron

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

1500 VPN

250 VPN

1000 to 1100 VPN

600 VPN

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

Ductility

Elasticity

Malleability

Plasticity

19. The coke in the charge of blast furnace

Forms a slag by combining with impurities

Supplies heat to reduce ore and melt the iron

Acts as an iron bearing mineral

Controls the grade of pig iron

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

It is lighter than pure aluminium

It has good machining properties

It is prone to age hardening

It can be forged

Page 3 of 4

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

Ductility

Brittleness

Plasticity

Malleability

22. Ductility of a material can be defined as

Ability to recover its original form

Ability to undergo large permanent deformations in compression

Ability to undergo large permanent deformations in tension

All of the above

23. 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

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

Chromium

Copper

Nickel

Silicon

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

Neutral

Brittle

Basic

Acidic

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

Phosphor bronze

Silicon bronze

White metal

Monel metal

27. Taps dies and drills contain carbon

Above 1%

Above 2.2%

Below 1%

Below 0.5%

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

None of these

Surface defect

Point defect

Line defect

29. 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%

0.35 to 0.45%

0.04%

30. 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

Page 4 of 4

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

Brittleness

Strength

Stiffness

Toughness

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

Reduce segregation in casting

Induce stresses

Refine grain structure

Improve mechanical properties

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

A complex cubic structure

F.C.C. crystal structure

H.C.P. structure

B.C.C. crystalline structure

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

Vanadium, chromium, tungsten

Chromium, titanium, vanadium

Tungsten, chromium, titanium

Tungsten, titanium, vanadium

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

0.05 to 0.20%

0.45 to 0.55%

0.55 to 1.0%

0.20 to 0.45%

36. 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

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

Throat

Bosh

Hearth

Stack

38. Hematite iron ore contains iron about

70%

55%

30%

45%

39. Cementite consist of

6.67% carbon and 93.33% iron

13% carbon and 87% ferrite

13% ferrite and 87% cementite

13% cementite and 87% ferrite

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

Machinability

Hardenability

Formability

Weldability

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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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