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Engineering Materials
0

Engineering Materials Practice Set-3

May 9, 2021

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Page 1 of 4

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

By forming a bulge

By shearing along oblique plane

By crushing into thousands of pieces

In direction perpendicular to application of load

2. The usual composition of a soldering alloy is

Tin and copper

Tin and lead

Tin, lead and small percentage of antimony

Tin, lead and silver

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

Strength

Toughness

Brittleness

Stiffness

4. The coke in the charge of blast furnace

Acts as an iron bearing mineral

Supplies heat to reduce ore and melt the iron

Controls the grade of pig iron

Forms a slag by combining with impurities

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

Formability

Machinability

Hardenability

Weldability

6. Ductility of a material can be defined as

Ability to undergo large permanent deformations in tension

Ability to undergo large permanent deformations in compression

Ability to recover its original form

All of the above

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

1000 to 1100 VPN

600 VPN

250 VPN

1500 VPN

8. Hematite iron ore contains iron about

30%

45%

55%

70%

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

Stack

Bosh

Hearth

Throat

10. Cementite consist of

13% ferrite and 87% cementite

13% carbon and 87% ferrite

6.67% carbon and 93.33% iron

13% cementite and 87% ferrite

Page 2 of 4

11. 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

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

Phosphor bronze

Silicon bronze

Monel metal

White metal

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

Refine grain structure

Reduce segregation in casting

Improve mechanical properties

Induce stresses

14. The tensile strength of wrought iron is maximum

Along the lines of slag distribution

None of the above

Perpendicular to lines of slag distribution

Uniform in all directions

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

0.55 to 1.0%

0.45 to 0.55%

0.05 to 0.20%

0.20 to 0.45%

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

Brass

Admiralty metal

Cast iron

Cast steel

17. 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

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

Y-alloy

Hindalium

Duralumin

Magnalium

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

0.35 to 0.45%

0.4 to 0.6%

0.04%

0.6 to 0.8%

20. The machinability of steel is improved by adding

Nickel and chromium

Chromium

Sulphur, lead and phosphorus

Nickel

Page 3 of 4

21. Points of arrest for iron correspond to

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

There is nothing like points of arrest

Stages at which properties do not change with increase in temperature

Stages at which allotropic forms change

22. Brass contains

70 - 75% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

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

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

Brittleness

Stiffness

Toughness

Strength

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

Nickel

Silicon

Chromium

Copper

25. Corundum contains more than 95%

MgO

SiO₂

Al₂O₃

Steel

26. Cobalt in steel

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

Gives ductility, toughness, tensile strength and anti corrosion property

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

Brittle

Basic

Acidic

Neutral

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

Malleability

Ductility

Plasticity

Brittleness

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

It is prone to age hardening

It is lighter than pure aluminium

It has good machining properties

It can be forged

30. 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 4 of 4

31. 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

32. The hardness of steel primarily depends on

Heat treatment employed

Shape of carbides and their distribution in iron

Percentage of alloying elements

Percentage of carbon

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

Plasticity

Elasticity

Ductility

Malleability

34. Tungsten in steel

Improves cutting ability and reduces hardenability

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

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

Improves wear resistance, cutting ability and toughness

35. Gamma-iron occurs between the temperature ranges of

600°C to 900°C

400°C to 600°C

900°C to 1400°C

1400°C to 1530°C

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

Vanadium, chromium, tungsten

Tungsten, titanium, vanadium

Tungsten, chromium, titanium

Chromium, titanium, vanadium

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

H.C.P. structure

F.C.C. crystal structure

B.C.C. crystalline structure

A complex cubic structure

38. Taps dies and drills contain carbon

Above 2.2%

Below 0.5%

Above 1%

Below 1%

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

Alpha iron, gamma iron and delta iron

Alpha iron, beta iron and gamma iron

Alpha iron and beta iron

Body centered cubic iron and face centered cubic iron

40. 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

50 : 20 : 10 : 20

30 : 20 : 30 : 20

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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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