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PEM > 1. > Flashcards

1. Flashcards

1
Q

materials that are used as raw material for any sort of
construction or manufacturing in an organized way of engineering applications.

A

ENGINEERING MATERIALS

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2
Q

polycrystalline bodies which are having number of differentially
oriented fine crystals.

A

METALS

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3
Q

metals are having iron as common element.

A

FERROUS METALS

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4
Q

metals are having very low permeability.

A

NON-FERROUS METALS

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5
Q

non-crystalline in nature. This exists in amorphic or
mesomorphic forms

A

NON-METALS

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6
Q

Engineering materials can also be classified as

A
  1. Metals and Alloys
  2. Ceramic Materials
  3. Organic Materials
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7
Q

are having very a low mechanical strength, which sometimes does not
match with the mechanical strength required for certain applications

A

PURE METAL

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8
Q

are the composition of two or more metals and non-metals together. Alloys are
having good mechanical strength, low temperature coefficient of resistance.

A

ALLOYS

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9
Q

non-metallic solids

A

CERAMIC MATERIALS

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10
Q

are usually long chain organic macro-molecules with co-valent
bonds. Each molecule is formed from a large number of unitary molecules known
as Monomer

A

POLYMER

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11
Q

are macro-physical combination of different phases where the aim
is to combine beneficial properties of the constituent materials.

A

COMPOSITE

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12
Q

are having carbon as a common element

A

ORGANIC MATERIALS

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13
Q

properties, which directly influence the choice of material, can be
summarized under the following categories:

A
  1. Physical properties
  2. Mechanical properties
  3. Chemical properties
  4. Electrical properties
  5. Magnetic Properties
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14
Q

“the mass per unit volume”. kg/m³

A

DENSITY OF MATERIAL

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15
Q

defined as the ratio of density of material with respect to density of a reference
material or substance.

A

SPECIFIC DENSITY OF MATERIALS

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16
Q

temperature at which the substance changes from one
state to another state

A

STATE CHANGE TEMPERATURE

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17
Q

represents the expansion in material with increase in temperature.

A

COEFFICIENT IN THERMAL EXPANSION (AREA,LINEAR,VOLUME)

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18
Q

the amount of heat required to increase the
temperature of unit mass of material by 1°C.

A

SPECIFIC HEAT OF MATERIAL

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19
Q

the amount of heat required/released by change
in unit mass of material from one state to another state (Phase change)

A

LATENT HEAT

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20
Q

property of material which represents that how easily a material can flow in liquid
state. It is reciprocal to the viscosity of a material

A

FLUIDITY OF MATERIALS

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21
Q

property of a material which presents that how easily the two pieces of material
can be welded together by applying pressure or heat or both.

A

WELD ABILITY OF MATERIALS

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22
Q

property of a material by which it regains its original dimensions on removal
of load or force.

A

ELASTICITY OF MATERIAL

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23
Q

increasing the load beyond the limit of elasticity, the material retains
it molded state.

A

PLASTICITY OF MATERIALS

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24
Q

quantity of voids in solid materials

A

POROSITY OF MATERIALS

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25
Q

the amount of heat
transmitted by unit thickness of material normal to the unit area surface in unit time
when the temperature gradient across the material piece is unity in steady state
condition”.

A

THERMAL CONDUCTIVITY OF MATERIAL

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26
Q

property of materials which represents that how easily the electricity can be
conducted by the material. It is denoted by ‘σ’. It is the reciprocal of resistivity of
material. It unit is mho/meter.

A

ELECTRICAL CONDUCTIVITY OF MATERIAL

27
Q

property of a material which opposes the deformation or breakdown of material
in presence of external forces or load

A

STRENGTH

28
Q

ability of a material to be deformed and to return to the original shape

A

ELASTICITY

29
Q

ability to resist deformation

A

STIFFNESS

30
Q

ability of the material to bend easily

A

FLEXIBILITY

31
Q

ability of a metal to be deformed considerably without ruptur

A

PLASTICITY

32
Q

ability of material to get stretched into a wire by pulling or
drawing. High temp=High_____

A

DUCTILITY

33
Q

susceptibility to extreme deformation in rolling or hammering

A

MALLEABILITY

34
Q

ability of a material to absorb the energy and gets plastically deformed without
fracturing

A

TOUGHNESS

35
Q

ability of material to absorb the energy when it is deformed elastically by
applying stress and release the energy when stress is removed.

A

RESILIENCE

36
Q

ability of a material to resist to permanent shape change due to external stress. (scratch,identation,rebound)

A

HARDNESS

37
Q

tendency to fracture without appreciable deformation.

A

BRITTLENESS

38
Q

property of a material which indicates the tendency of material to move
slowly and deform permanently under the influence of external mechanical stress

A

CREEP AND SLIP

39
Q

weakening of material caused by the repeated loading of the material.

A

FATIGUE

40
Q

somewhat indefinite property that refers to the relative ease with which a material
can be cut.

A

MACHINABILITY

41
Q

indicates the elements which are
combined together to form that material

A

CHEMICAL COMPOSITION

42
Q

represents how atoms are bounded to each other to form the
material.

A

ATOMIC BONDING

43
Q

forms by exchanging of valence electrons between atoms

A

IONIC BONDING

44
Q

forms by sharing of electrons between atoms.

A

COVALENT BONDS

45
Q

found in metals(bonds)

A

METALLIC BOND

46
Q

ability of material to resist the
oxidation in atmospheric condition

A

CORROSION RESISTANCE

47
Q

indicates that how they react with other materials.

A

ACIDITY AND ALKALINITY

48
Q

property of material which resists the flow of electric current through material.

A

RESISTIVITY

49
Q

property of
material with
allow the flow
of electric current through material

A

CONDUCTIVITY

50
Q

property of material which indicates the ability of material to withstand at high
voltages.

A

DIELECTRIC STRENGTH

51
Q

indicates the change in resistance
of material with change in temperature

A

TEMPERATURE COEFFICIENT OF RESISTANCE

52
Q

junction formed by joining to two metals is heated, a small voltage in the range
of millivolt is produced

A

THERMOELECTRICITY

53
Q

property of magnetic material which indicates that how easily the magnetic flux
is build up in material

A

PERMEABILITY

54
Q

even after removal of external magnetic field,
some magnetization exists, which is called residual magnetism

A

RETENTIVITY

55
Q

external magnetic motive force (ATs)
required to overcome the residual magnetism is called “c_____ f_____” of material.

A

COERCIVE FORCE

56
Q

property of magnetic material which resists to buildup of magnetic flux in
material.

A

RELUCTANCE

57
Q

Hexagonal
Shades of red and reddish
brown
70-60%
5- 6 HARDNESS

A

HEMATITE

58
Q

Isometric
Steel grey or black
72-62%
5.5- 6.5 HARDNESS

A

MAGNETITE

59
Q

Amorphous
Yellowish brown
63-59%
4- 5.5 HARDNESS

A

LIMONITE

60
Q

Hexagonal
Pale yellow to dark
brown and black if Mn is
present in excess
48%
3.5- 4 HARDNESS

A

SIDERITE

61
Q

Isometric
Dark yellow to yellowish
brown
46%
6- 6.5 HARDNESS

A

PYRITE

62
Q

form of mining in which the soil and the rock covering the mineral
deposits are removed

A

SURFACE MINING

63
Q

used to extract ore from below the surface of the earth
safely, economically and with as little waste as possible

A

UNDERGROUND MINING

64
Q

Crude ore, or ore mined in the natural state, seldom occurs in a pure state and requires
some form of beneficiation

A

BENEFICIATION PRODUCTION OF PIG IRON

PEM (1 decks)

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