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Metals Flashcards

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
For a steel containing 0.8% carbon?
There is only one critical point
26
Nickel in steel?
Gives ductility, toughness, tensile strength and anti-corrosion properties
27
For safety, the fuse wire used in the mains for household supply of electricity must be made of metal having
Low melting point
28
For galvanizing iron which of the following metals is used?
Zinc
29
The element of an electric stove made
Nicrome
30
Non stick cooking utensils are coated with
Teflon
31
Tensile strength of steel can be safely increased by
Adding carbon up to 0.83%
32
Amorphous material is one
In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
33
Steel contains
50% or more iron
34
The alloy, mainly used for corrosion resistance in stainless steels is
Chromium
35
Sulphur in steel
Lowers the toughness and transverse ductility
36
Aluminium bronze contains
10% aluminium and 90% copper
37
Cast iron is a?
Brittle material
38
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
Manganese
39
Which of the following has a fine gold colour and is used for imitation jewellery?
Aluminium bronze
40
The ability of a material to absorb energy in the plastic range is called
Resilience
41
Malleable cast iron is produced
From white cast iron by annealing process
42
The hardness is the property of a material due to which it?
Can cut another metal
43
The percentage of carbon in cast iron varies from?
1.7 to 4.5%
44
Shock resisting steels should have
Toughness
45
Brass is an alloy of
Copper and Zinc
46
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
Hypo-eutectic cast irons
47
The heat treatment process used for softening hardened steel is
Tempering
48
The lower critical point for all steels is?
723°C
49
Manganese bronze has?
High resistance to corrosion
50
Silicon bronze contains?
96% copper, 3% silicon and 1% manganese
51
Steel containing 0.8 to 1.5% carbon, is known as?
High carbon steel
52
The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is?
Plasticity
53
Steel containing upto 0.15% carbon, is known as?
Dead mild steel
54
Generically, a ferrous alloy, the carbon content of which is typically between 3.0 and 4.5 wt% C
Cast Iron
55
A metallic substance that is composed of two or more elements
Alloy
56
A mode of fracture that involves gross plastic deformation
Ductile fracture
57
Deformation that is non – permanent, that is, totally recovered upon release of an applied load
Elastic deformation
58
The measure of a material’s resistance to deformation by surface indentation (e.g. scratches)
Hardness
59
A metal alloy for which iron is not the prime constituent
Non – ferrous alloy
60
Deformation that is permanent or non – recoverable after the release of the applied load
Plastic deformation
61
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%
Stainless steel
62
The maximum engineering stress, in tension, that may be sustained without fracture. Often termed ultimate tensile strength
Tensile strength
63
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
Yield strength
64
A metal alloy for which iron is the prime constituent
Ferrous alloy
65
A measure of a material’s ability to undergo appreciable plastic deformation before fracture
Ductility
66
The ratio of stress to strain when deformation is totally elastic; also a measure of the stiffness of the material
Modulus of elasticity (young’s modulus)

Materials Science (4 decks)

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