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indiabix > Materials of Construction > Flashcards

Materials of Construction Flashcards

1
Q

The addition of antimony in tin-based alloys improves its

A

deformation resistance

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2
Q

The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.

A

4

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3
Q

Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.

A

12 - 14

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4
Q

A suitable material of construction to use with fuming sulphuric acid is

A

monel

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5
Q

Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C?

A

Brass, cast iron, mild steel and tin

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6
Q

Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of

A

rubber lined mild steel

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7
Q

Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?

A

Stainless steel

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8
Q

Which of the following is not a copper based alloy with nickel?

A

Inconel

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9
Q

Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the

A

endurance limit

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10
Q

Copper is dissolved from its ore by H2SO4 in a percolation tank made of

A

reinforced concrete lined with lead

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11
Q

Presence of manganese in alloy steel improves its

A

abrasion resistance & toughness

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12
Q

Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with

A

lead or acid-proof bricks

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13
Q

Reduction in the grain size reduces the __________ of the material.

A

creep resistance

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14
Q

Addition of nickel to copper improves its

A

hardness

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15
Q

High speed cutting tool steels contain about __________ percent of tungsten.

A

18 - 20

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16
Q

Mixing vessel used for the chlorination of methane to produce methyl chloride is made of

A

cast iron

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17
Q

Stainless steel is not corroded by

A

nitric acid (10%)

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18
Q

The carbonating tower used in Solvay process of soda ash manufacture is made of

A

cast iron

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19
Q

An ideal material of construction for the storage of 50% caustic soda solution would be

A

monel

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20
Q

In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of

A

cast iron

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21
Q

Brine solution is stored/treated in __________ lined vessels/pipes.

A

nickel

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22
Q

Tin coating on metals is not done by

A

powder metallurgy

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23
Q

Silicon percentage in iron castings to have maximum hardness should be about

A

0.8

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24
Q

Which of the following crystal structures characterises the ferritic stainless steel?

A

Body centred cubic

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25
Q

Polythene (low or high density) containers are not corroded by

A

sulphuric acid (10%) at room temperature.

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26
Q

Balls in a ball mill are usually made of

A

steel

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27
Q

A material is able to retain the deformation permanently by virtue of its

A

plasticity

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28
Q

Coke oven walls are lined with __________ bricks.

A

silica

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29
Q

Urea autoclave is made of

A

stainless steel

30
Q

Carbon content in plain carbon steel is __________ percent.

A

0.35 to 0.45

31
Q

Silicon percentage in acid resistant cast iron is about

A

14

32
Q

Water gas generator is made of

A

carbon steel-brick lined

33
Q

Brinell Hardness Number (BHN) for talc is approximately in the range of

A

20 - 30

34
Q

Dies for wire drawing are generally made of

A

carbides

35
Q

Babbit metal used for making bearings should have

A

high-co-efficient of friction between journal and bearing.

36
Q

Vessels made of __________ can be used to store dry chlorine.

A

steel or iron

37
Q

Which of the following alloying elements is present in maximum percentage in high speed steel.

A

tungsten

38
Q

Electronic structure of a material is generally studied by

A

spectroscopic techniques

39
Q

Which of the following is not used as the ceramic material in ‘cermets’ ?

A

nitrides

40
Q

For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is

A

cast iron

41
Q

Common house hold glass (i.e., soda-lime glass) is a/an __________ material.

A

partly crystalline

42
Q

Cold worked steel parts are normally subjected to

A

annealing

43
Q

A bearing metal should not have

A

low thermal conductivity

44
Q

__________ is not a case hardening process.

A

Annealing

45
Q

The ability of a material to absorb energy in the elastic range is a measure of its

A

resilience

46
Q

Phenol is not shipped in

A

cast iron containers

47
Q

Aqueous nitric acid is stored in

A

stainless steel vessel

48
Q

Thermosetting polymers are

A

cast moulded

49
Q

Maximum consumption of lead is in the manufacture of

A

storage batteries

50
Q

Clock pendulums are usually made of __________ steel.

A

none of these

51
Q

Which of the following is produced by addition polymerisation?

A

polybutadiene

52
Q

Which of the following is not shipped in mild steel containers?

A

formic acid

53
Q

Maximum carbon content in cast iron is __________ percent.

A

4.3

54
Q

Manganese in steel affects its

A

tensile strength

55
Q

Lead lined equipments & vessels are suitable for handling

A

sulphuric acid up to 60°C

56
Q

Reactor used in the production of polyvinyl chloride (PVC) is made of

A

nickel or glass lined steel

57
Q

Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its

A

high corrosion resistance

58
Q

Pick out the wrong statement.

A

Presence of silicon in steel decreases its electrical resistance.

59
Q

Hydrocyanic acid is not shipped in

A

cast iron vessels

60
Q

Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of

A

stainless steel

61
Q

Gas holder of a gobar (cowdung) gas plant is made of

A

mild steel

62
Q

A measure of toughness of a material is its

A

yield strength

63
Q

Polymorphism is not exhibited by

A

none of these

64
Q

Which of the following metals in not used for coating of the base metal to guard it against corrosion ?

A

magnesium

65
Q

Aqueous nitric acid is stored in __________ vessel.

A

cast iron

66
Q

Carbon is present in the uncombined (graphitic) form in case of

A

cast iron

67
Q

The damage/deterioration of metals by the __________ action of fluids is called ‘erosion’.

A

abrasive

68
Q

Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with

A

acid refractory

69
Q

In cold working of metal as compared to its hot working

A

appreciable strain hardening is produced

70
Q

Containers made of high silicon cast iron (14% Si) are not suitable for the storage of

A

hydrochloric acid (concentrated)

indiabix (3 decks)

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