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Materials Science > Metals > Flashcards

Metals Flashcards

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1
Q

The correct units for Young’s Modulus are?

A

N/mm2

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2
Q

Non-Ferrous metals contain?

A

Up to 10% iron

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3
Q

Good ductility is required in structural steel because of?

A

Possible impact, explosion, earthquake, etc.

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4
Q

Young’s Modulus (E) of a material measures?

A

Stiffness

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5
Q

Bronze contains?

A

Copper

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6
Q

Medium carbon steels are used for construction because?

A

They combine strength and ductility

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7
Q

Wrought Iron contains? (% carbon?)

A

No carbon

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8
Q

Increasing the carbon content of steel?

A

Increases the U.T.S. of the steel

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9
Q

Steel was an important addition to the family of construction materials because of its?

A

Tensile strength

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10
Q

Cast Iron contains? (% carbon?)

A

More carbon than steel

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11
Q

Increasing the carbon content of steel?

A

Increases the yield strength and reduces the ductility

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12
Q

Global consumption is in excess 1,000,000,000 tonnes of metals per year. Of this amount, iron and steel represents?

A

90% of the total

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13
Q

Steel is an alloy of iron and?

A

Carbon

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14
Q

Designation mortar mixes are specified by?

A

BS 5628

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15
Q

Which one of the following metals would work-harden more quickly than the others? Copper, Brass, Lead or Silver?

A

Brass

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16
Q

Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

A

More than

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17
Q

Bell metal contains?

A

70 - 75% copper and rest tin

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18
Q

The composition of silver solder is?

A

Silver, copper, zinc

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19
Q

When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

A

Less than

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20
Q

Pipes for bicycle frames are made of

A

Cold rolled steel

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21
Q

The following element can’t impart high strength at elevated temperature

A

Magnesium

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22
Q

The percentage carbon content in wrought iron is abou?

A

0.02

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23
Q

The silicon steel is widely used for?

A

Generators and transformers in the form of laminated cores

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24
Q

Blast furnace produces following by reduction of iron ore

A

Pig iron

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25
Q

For a steel containing 0.8% carbon?

A

There is only one critical point

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26
Q

Nickel in steel?

A

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

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27
Q

For safety, the fuse wire used in the mains for household supply of electricity must be made of metal having

A

Low melting point

28
Q

For galvanizing iron which of the following metals is used?

A

Zinc

29
Q

The element of an electric stove made

A

Nicrome

30
Q

Non stick cooking utensils are coated with

A

Teflon

31
Q

Tensile strength of steel can be safely increased by

A

Adding carbon up to 0.83%

32
Q

Amorphous material is one

A

In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

33
Q

Steel contains

A

50% or more iron

34
Q

The alloy, mainly used for corrosion resistance in stainless steels is

A

Chromium

35
Q

Sulphur in steel

A

Lowers the toughness and transverse ductility

36
Q

Aluminium bronze contains

A

10% aluminium and 90% copper

37
Q

Cast iron is a?

A

Brittle material

38
Q

An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

A

Manganese

39
Q

Which of the following has a fine gold colour and is used for imitation jewellery?

A

Aluminium bronze

40
Q

The ability of a material to absorb energy in the plastic range is called

A

Resilience

41
Q

Malleable cast iron is produced

A

From white cast iron by annealing process

42
Q

The hardness is the property of a material due to which it?

A

Can cut another metal

43
Q

The percentage of carbon in cast iron varies from?

A

1.7 to 4.5%

44
Q

Shock resisting steels should have

A

Toughness

45
Q

Brass is an alloy of

A

Copper and Zinc

46
Q

Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

A

Hypo-eutectic cast irons

47
Q

The heat treatment process used for softening hardened steel is

A

Tempering

48
Q

The lower critical point for all steels is?

A

723°C

49
Q

Manganese bronze has?

A

High resistance to corrosion

50
Q

Silicon bronze contains?

A

96% copper, 3% silicon and 1% manganese

51
Q

Steel containing 0.8 to 1.5% carbon, is known as?

A

High carbon steel

52
Q

The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is?

A

Plasticity

53
Q

Steel containing upto 0.15% carbon, is known as?

A

Dead mild steel

54
Q

Generically, a ferrous alloy, the carbon content of which is typically between 3.0 and 4.5 wt% C

A

Cast Iron

55
Q

A metallic substance that is composed of two or more elements

A

Alloy

56
Q

A mode of fracture that involves gross plastic deformation

A

Ductile fracture

57
Q

Deformation that is non – permanent, that is, totally recovered upon release of an applied load

A

Elastic deformation

58
Q

The measure of a material’s resistance to deformation by surface indentation (e.g. scratches)

A

Hardness

59
Q

A metal alloy for which iron is not the prime constituent

A

Non – ferrous alloy

60
Q

Deformation that is permanent or non – recoverable after the release of the applied load

A

Plastic deformation

61
Q

A steel alloy that is highly resistant to corrosion in a variety of environments. The predominant alloying element is chromium, which must be present in a concentration of at least 11 wt%

A

Stainless steel

62
Q

The maximum engineering stress, in tension, that may be sustained without fracture. Often termed ultimate tensile strength

A

Tensile strength

63
Q

The stress required to produce a very slight yet specified amount of plastic strain; this strength is normally associated with the onset of plastic deformation

A

Yield strength

64
Q

A metal alloy for which iron is the prime constituent

A

Ferrous alloy

65
Q

A measure of a material’s ability to undergo appreciable plastic deformation before fracture

A

Ductility

66
Q

The ratio of stress to strain when deformation is totally elastic; also a measure of the stiffness of the material

A

Modulus of elasticity (young’s modulus)

Materials Science (4 decks)

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