All in (Repaired)

Question 1

This factor is not a component of a material

Processing

Crystallinity

Properties

Performance

Question 2

Substances in which measured properties are independent of the direction of measurement

Anisotropic

Bitropic

Isotropic

Multitropic

none of the above

Question 3

Which of the following has the highest resistance to fracture

Polymers

Ceramics

Metals

Composites

Question 4

!elate to the chemical reactivity of materials"

Mechanical

#lectrical

Thermal

none of the above

Question 3


Polymers

Ceramics

Metals

Composites

Question 4


Mechanical

#lectrical

Thermal

$eteriorative

Question 5

%ne basic classification of a material

Composite

Plastics

Alloys

Metals

Question 6

&"Tries &"Tries to create a new material with the desired properties based on an e'isting material with similar properties

Materials Scientist and #ngineers

Industrial #ngineer

Civil #ngineer

Chef

Question 7

$efined as the characteristic of a material that differentiate it from other materials" It is independent on its si(e and shape

Property of a Material

Structure of a Material

Process of a Material

Performance of a Material

none of the above

Question 8

This is not a property of a Material

Mechanical

#lectrical

)eat Transfer

%ptical

Question 9

Correct" What is the difference between atomic mass and atomic weight

Atomic mass is the average of the atomic masses of an atom*s naturally occurring isotopes+ whereas atomic weight is the weight of an individual atom"

Atomic mass is characteri(ed by the number of neutrons in the nucleus+ whereas atomic weight is the weight of an individual atom"

Atomic mass is the mass of an individual atom+ whereas atomic weight is the average ,weighted- of the atomic masses of an atom*s naturally occurring isotopes"

Atomic weight . Atomic mass / g"

Atomic mass is characteri(ed by the number of protons in the nucleus+ whereas atomic weight is the average ,weighted- of the atomic masses of an atom*s naturally occurring isotopes"

Question 10

Correct" The net potential energy between two ad0acent ions+ E N+ may be represented by

Where A, B, and n are constants whose values depend on the particular ionic system. Calculate the bonding energy E 1 in terms of the parameters A+ B+ and n using the following procedure2 (1) $ifferentiate E N with respect to r + and then set the resulting e'pression e3ual to (ero+ since the curve of E N versus r is a minimum at E 1" (2) Solve for r in terms of A+ B+ and n+ which yields r 1+ the e3uilibrium interionic spacing" (3) $etermine the e'pression for E 1 by substitution of r 1 into the above e3uation for E N" Which of the following e3uations represents the e'pression for E 1

Question 11

4our answer is correct" What type,s- of bonding would be e'pected for brass ,a copper5(inc alloy- Covalent bonding with some van der Waals bonding

Metallic bonding

van der Waals bonding

Ionic bonding

Question 12

Correct" The nucleus of an atom contains

#lectrons

6eutrons

Protons

Question 13

Correct"

The atomic number of an electrically neutral atom is e3ual to the number of2 Choose all that apply"

Protons

#lectrons

6eutrons

Question 14

Type of chemical bond formed through an electrostatic attraction between two oppositely charged ions

Metallic bond

Ionic bond

Covalent bond

Capillary bond

Question 15

Which atomic model is currently used to describe the wave particle duality of electrons

Bohr atomic model

!utherford*s model

7uantum theory

String theory

Question 16

At the state of e3uilibrium+ the repulsive force is e3ual to

The frictional force

The attractive force

The buoyant force

The resultant force

Question 17

Two atoms that are bonded with this bond will each contribute at least one electron to the bond+ and the shared electrons may be considered to belong to both atoms

Covalent bond

Metallic bond

Mechanical bond

Ionic bond

none of the above

Question 18

Correct" What is the difference between atomic structure and crystal structure

Atomic structure relates to the type of atomic bonding" Crystal structure pertains to the arrangement of atoms in the crystalline solid material"

Atomic structure relates to the number of electrons" Crystal structure pertains to the type of atomic bonding in the crystalline solid material"

Atomic structure relates to the arrangement of protons and neutrons in the nucleus of an atom" Crystal structure pertains to the electron structure of the individual atoms" Atomic structure relates to the number of protons and neutrons in the nucleus of an atom" Crystal structure pertains to the number and probability distributions of the electrons"

Atomic structure relates to the number of protons and neutrons in the nucleus of an atom+ as well as the number and probability distributions of the constituent electrons" Crystal structure pertains to the arrangement of atoms in the crystalline solid material" Question 19

Correct" Which crystal system,s- listed below has ,have- the following relationship for the unit cell edge lengths

%rthorhombic

Tetragonal

Monoclinic

)e'agonal

!hombohedral

Triclinic

Cubic

Question 20

Basic structural unit or building bloc8 of the crystal structure and defines the crystal structure by virtue of its geometry and the atom positions within

Building unit

Cubicle

Crystal cell

9nit cell

Question 21

)ow many atoms can be contained in an )e'agonal Closed Pac8 Structure

:

;

<

=

Question 22

4our answer is correct" A steel rod is pulled in tension with a stress that is less than the yield strength" The modulus of elasticity may be calculated as

A'ial load divided by change in length

A'ial stress divided by a'ial strain

A'ial stress divided by change in length

A'ial stress times a'ial strain

Question 23

Correct" >or most metals+ the relationship between elastic and shear moduli is appro'imately which of the following

G .

1"& E

G .

1": E

G .

1"? E

G .

1"; E

G .

1"@ E

Question 24

This law states that in the linear part of the stressstrain curve+ the slope of the linear part is e3ual to the 4oung*s Modulus

%hm*s aw

4oung*s aw

)oo8e*s aw

none of the above

Question 25

$efined as the ratio of lateral and a'ial strains

4oung*s !atio

Capacitive !atio

Poisson*s !atio

none of the above

Question 26

>orce or load per unit area of crosssection over which the force or load is acting

Stress

Strain

Tensile >orce

Shear >orce

none of the above

Question 27

In metals+ the stress level at which plastic deformation begins

inear Point

Plastic $eformation Point

>ailure Point

Proportional imit

none of the above

Question 28

The slope of the linear part of the stress-strain curve in t he elastic reion!

4oung*s Modulus

Tensile Modulus

Strain Modulus

none of the above

Question 29

This modulus may be thought of as stiffness+ or a material*s resistance to elastic deformation

%hm*s Modulus

4oung*s Modulus

Modulus of Inelasticity

none of the above

Question 30

This is the point in the stressstrain curve wherein brea8ing occurs

>racture

9ltimate Tensile Strength


Brea89p Point

none of the above

Question 31

>or a parallel plate capacitor+ increasing the dielectric constant will increase the

oltage

!esistance

Inductance

Capacitance

none of the above

Question 32

If the voltage applied to a material is ::1  and the current passing through it is & ampere+ what is the resistance of the material

::": ohms

::1 ohms

:": ohms

1"@ ohms

none of the above

Question 33

This material property is indirectly proportional to conductivity

!esistance

!esistivity

Conductance

Capacitance

none of the above

Question 34

The unit of Capacitance is

%hms

>arad

olts

Amperes

none of the above

Question 35

aw that states that the voltage applied to the material is directly proportional to the current passing through the material

Capacitive aw

Mho*s aw

%hm*s aw

!esistive aw

none of the above

"o#ponent of $aterial


Processing

Crystallinity

Properties

Performance

%ropert& of $aterial


Mechanical

#lectrical

)eat Transfer

%ptical



Anisotropic

Bitropic

Isotropic

Multitropic

none of the above

$aterials 'cience an nineerin

&"Tries to create a new material with the desired properties based on an e'isting material with similar properties


Industrial #ngineer

Civil #ngineer

Chef

"lassification of $aterials


Composite

Plastics

Alloys

Metals



Polymers

Ceramics

Metals

Composites



Mechanical

#lectrical

Thermal

$eteriorative

"haracteristics of $aterials






none of the above

*orces in +to#s




The buoyant force

The resultant force

+to#ic $oel


Bohr atomic model

!utherford*s model

7uantum theory

String theory

T&pes of ,ons


Metallic bond

Ionic bond

Covalent bond

Capillary bond

,ons in +to#s


Covalent bond

Metallic bond

Mechanical bond

Ionic bond

none of the above

+to#s in *"" 'tructure

)ow many atoms can be contained in an >CC structure

&

:

?

;

'tructure of *""

If the radius of a face centered cubic crystal is half the length of its unit cell edge+ then the relationship of the >CCs radius and edge length is

a.pi!D:

a.!

a.:"@!

6one'istent because the structure cannot be formed

none of the above

'tructure of ,""

If the radius of the body centered cubic crystal is S7!T,?- Angstrom ,A- then the unit edge is

:A

;A

?A

&
+to#s in e.aonal '&ste#s


:

;

<

=

,asic ,uilin ,loc/ of "r&stal 'tructure


Building unit

Cubicle

Crystal cell

9nit cell

e lenth an aius of the +to#

If the radius of a face centered cubic crystal is & Angstrom ,A-+ then the unit edge is

a.!D:

a.:

a.&

a.:S3rt,:-

$echanical %ropert&


inear Point


>ailure Point


none of the above

$echanical %ropert&

The slope of the linear part of the stressstrain curve in the elastic region"

4oung*s Modulus

Tensile Modulus

Strain Modulus

none of the above

$echanical %ropert&


%hm*s aw

4oung*s aw

)oo8e*s aw

none of the above

$echanical %ropert&


>racture



Brea89p Point

none of the above

$echanical %ropert&


%hm*s Modulus

4oung*s Modulus


none of the above

$echanical %ropert&


Stress

Strain

Tensile >orce

Shear >orce

none of the above

$echanical %ropert&


4oung*s !atio

Capacitive !atio

Poisson*s !atio

none of the above

lectroche#ical "onsieration

!eaction in which the electrons from the anodic region is transferred and become part of another chemical species

%'idation

!eduction

#lectromigration

Superconduction

none of the above

.iation

This process will form nonmetallic films or scales in metals

%'idation

!eduction

#lectromigration

Superconduction

none of the above


This process will result in the loss of electrons in metals

%'idation

!eduction

#lectromigration

Superconduction

none of the above

lectrical %roperties


!esistance

!esistivity

Conductance

Capacitance

none of the above



Capacitive aw

Mho*s aw

%hm*s aw

!esistive aw

none of the above

h#s a


::": ohms

::1 ohms

:": ohms

1"@ ohms

none of the above

"apacitance


%hms

>arad

olts

Amperes

none of the above

"apacitance


oltage

!esistance

Inductance

Capacitance

none of the above

Ther#al %ropert&

Stress induced in a body as a result of slow changes in temperature

Thermal Shoc8

Thermal Stress

Thermal annealing

Thermal Tempering

none of the above

Ther#al %ropert&

If the change in temperature of a certain & meter aluminum wire is &11 deg Celsius+ what is the change in its length ,Alpha . :?"< ' &1D
:?"< ' &1D; m

:?"< ' &1D; m

:"?< ' &1D; m

1":?< ' &1D; m

none of the above

Ther#al %ropert&

It represents the amount of energy re3uired to produce a unit temperature rise"

)eat Capacity

Calories

)eat

Foule

none of the above

$anetic %ropert&

This 8ind of magnetic field is wea8 and attracts towards the e'ternal magnetic field applied to the material

$iamagnetic

Paramagnetic

>errimagnetic

>erromagnetic

none of the above

$anetic %ropert&

This 8ind of magnetic field is strong and e'ists even without the presence of e'ternal magnetic field

Paramagnetic

>erromagnetic

$iamagnetic

none of the above

$anetic %ropert&

This 8ind of magnetic field is wea8 and opposes the e'ternal magnetic field applied to the material

$iamagnetic

Paramagnetic

>errimagnetic

>erromagnetic

none of the above

ner& of iht

If the fre3uency of the light source is &1 hert(+ the energy of the light is

<"
?"?? ' &1D< F

?"?? ' &1D? F

<"
ptical %roperties

$escribes how light propagates through a medium

!efractive Inde'

!eflective Inde'

Capacitance

Inde' of luminosity

none of the above


Phenomenon wherein the absorbed energy of the material is reemitted as visible light" The interval between absorption and reemission is greater than & second

uminiscence

Transluscence

Phosphorescence

Transparence

none of the above


Materials that are capable of transmitting light with relatively little absorption and reflection

Phosphorescent

Transparent

%pa3ue

>lourescent

none of the above

'pee of iht

If the wavelength of light is & ' &1D= m+ its fre3uency is

&E? m

?m

? hert(

&E? hert(

none of the above

7uestion &+ Part & A coppernic8el alloy of composition ;1 wtG 6i<1 wtG Cu is slowly heated from a temperature of &&@1HC ,:&11 H>-" ,a- At what temperature does the first li3uid phase form ,b- What is the composition of this li3uid phase ,c- At what temperature does complete melting of the alloy occur ,d- What is the composition of the last solid remaining prior to complete melting See Animated >igure "?a

Part 1

Carefully review Section "J and >igure "?" Thin8 about what happens to the composition given in the problem as you slowly heat it" What happens to this composition when it passes the solidus line If you are having difficulty with this problem+ you may wish to review2 Solving #3uations Kraphing Conceptual %verview At what temperature does the first li3uid phase form 9.11

LC

the tolerance is +/-2%

Question 2

4our answer is incorrect" >or an alloy of composition @1 wtG n@1 wtG Cu+ what phase,s- is ,are- present at ;11HC and what is ,are- the mass fraction,s- of the phase,s- 4ou may find the Animated >igure "& ,the Cun phase diagram- helpful"

β and γ phases

i3uid phase

β phase

β' and γ phases

α phase

Question 4

Incorrect" Which of the following 8inds of information may be determined with the aid of a phase diagram

The phase,s- present at a specified temperature and composition"

The fraction,s- of phase,s- present at specified temperature and composition"

The composition,s- of phase,s- present at a specified temperature and composition"

Question 5

Correct" A li3uidus line separates which of the following combinations of phase fields

i3uid N O and ON 

O and i3uid N O

i3uid and i3uid N O

O and ON 

Question 6

Incorrect" A solvus line separates which of the following pairs of phase fields


O and ON 

O and i3uid N O


Question 7

4our answer is correct" >rom the list below+ select four situations in which casting is the preferred fabrication techni3ue" (1) >or

large pieces andEor complicated shapes

(2) >or

alloys having low ductilities

(3) When

the processing would be very precise

(4) When

mechanical strength is not an important consideration

(5) When

it is needed to 0oin a large variety of metals and a lloys

(6) When

it is the most economical fabrication techni3ue

(1)+ (2)+ (4)+ (6)

(1)+ (2)+ (4)+ (5)

(2)+ (3)+ (5)+ (6)

(2)+ (3)+ (4)+ (6)

(1)+ (3)+ (4)+ (5)

Question 8

Correct" >orging operations normally ta8e place at

!oom temperature

)igh temperatures

ow temperatures

Question 9

Correct" Which of the following are forming operations

$rawing

Powder metallurgy

Welding

Continuous casting

#'trusion

$ie casting

>orging

!olling

Question 10

4our answer is correct" Is it possible to grind up and reuse phenolformaldehyde

6o+ it is not possible"

4es+ it is possible"

Question 11

Incorrect" )ow does the electron structure of an isolated atom differ from that of a solid material +nser

An isolated atom has states"

an electron band structure " Solid materials have discrete electron energ

An isolated atom has discrete electron energ states " Solid materials have electron band structures "

Question 12

Correct" Which of nSe and KaAs has the larger band gap energy

KaAs

nSe

Question 13

Correct" Which type of charge carrier will be introduced into a semiconductor by the presence of an acceptor impurity

#lectron

)ole

Question 14

Correct" Which type of charge carrier will be introduced into a semiconductor by the presence of a donor impurity

)ole

#lectron

Question 15

Correct" >or a semiconductor+ when an electric field is applied+ in which direction are the holes accelerated

In the same direction as the electric field"

%pposite to the direction of the electric field"

Question 16

Correct" The electrical conductivity of an e'trinsic semiconductor is

characteristic of the highpurity material"

due to the presence of impurities"

Question 17

Correct" Are energies for electrons that participate in the conduction process ,i"e"+ free electrons- greater or less than the >ermi energy

ess than

Kreater than

Question 18

Correct" Are energies for holes greater or less than the >ermi energy

Kreater than

ess than

Question 19

Correct" An insulator has an energy band gap that is relatively

narrow"

wide"

Question 20

Correct" The electrical conductivity of an intrinsic semiconductor is



Question 21

Correct" )ow do the electrical conductivities of metals compare with those of semiconductors

QMetals R QSemiconductors

QMetals .QSemiconductors

QMetals  QSemiconductors

Question 22

Correct" >or an ntype semiconductor+ which type of charge carrier is present in the greater concentration

#lectron

)ole

Question 23

Correct" >or an ntype semiconductor

Concentrationelectrons  concentrationholes

Concentrationelectrons .Concentrationholes

Concentrationelectrons R Concentrationholes

Question 24

Correct" >or a !type semiconductor+ semiconductor+ which type of charge carrier is present in the greater concentration

#lectrons

)oles

Question 25

Correct" >or a !type semiconductor




Question 26

Correct" In order for a semiconductor to e'hibit e'trinsic electrical characteristics+ relatively high impurity concentrations are re3uired"

True

>alse

Question 27

Correct" A semiconductor has an energy band gap that is relatively

narrow"

wide"

Question 28

Correct" )ow does increasing temperature affect the concentration of both electrons and holes in an intrinsic semiconductor

May increase andEor decrease the concentration+ depending on the temperature range"

Increases the concentration"

$ecreases the concentration"

%ractice Question ,inar& utectic '&ste#s 

Correct 9sing Animated >igure "=+ "=+ determine which of the phasesEphase combinations combinations listed below will be present for an alloy of composition ;< wtG Sn  @; wtG Pb that is at e3uilibrium at ;;HC

li3uid

beta

beta N li3uid

alpha N beta N li3uid

alpha N beta

alpha

alpha N li3uid

%ractice Question ,inar& utectic '&ste#s 

Correct 9sing the Animated >igure "=+ determine which of the phasesEphase combinations listed below will be present for an alloy of composition JJ wtG Sn  :? wtG Pb that is at e3uilibrium at &1HC

beta N li3uid

alpha

alpha N li3uid

alpha N beta


beta

li3uid

%ractice Question evelop#ent of $icrostructure in utectic +llo&s

Correct 9sing the Animated >igure "=+ for an alloy of composition :@ wtG Sn  J@ wtG Pb+ select the phase,s- present and their composition,s- at :11HC"

" .

:@ wtG Sn  J@ wtG PbU α . :@ wtG Sn  J@ wtG Pb

α .

&J wtG Sn  =? wtG PbU β . @@"J wtG Sn  ;;"? wtG P

O . &J wtG Sn  =? wtG PbU " . @@"J wtG Sn  ;;"? wtG Pb

α .

&="? wtG Sn  =&"J wtG PbU β . J"= wtG Sn  :": wtG Pb

%ractice Question utectoi eactions

Correct A eutectoid reaction involves which of the following phases

Three solid

Two li3uids and one solid

%ne li3uid and one solid

%ne li3uid and two solid

%role# 9!16

4our answer is correct" >or an alloy of composition @1 wtG n@1 wtG Cu+ what phase,s- is ,are- present at &111HC and what is ,are- the mass fraction,s- of the phase,s- 4ou may find the Animated >igure "& ,the Cun phase diagram- helpful"

β' and γ phases

α phase

β and γ phases

β phase

i3uid phase

Problem "J<

4our answer is correct" The mass fraction of eutectoid cementite in a h!er eutectoid ironcarbon alloy ,0ust below its eutectoid temperature- is 1"&1;" %n the basis of this information+ determine the composition of the alloy" If it is not possible to determine the composition from the information provided+ enter 1"

1.11003

%role# 9!77

4our answer is incorrect"

wtG C

The mass fraction of eutectoid ferrite in a h!oeutectoid ironcarbon alloy ,0ust below its eutectoid temperature- is 1"=@;" %n the basis of this information+ determine the composition of the alloy" If it is not possible to determine the composition from the information provided+ enter 1"

wtG C

0

'upple#ental Question utectoi reaction

Correct" A eutectoid reaction involves which of the following phases




Three solid

'upple#ental Question iuius line


O and i3uid N O

O and ON 



'upple#ental Question %eritectic reaction

Correct" A peritectic reaction involves which of the following combinations of phase fields




Three solid

'upple#ental Question %hases present at eutectic point

Correct" At a eutectic point on a binary temperaturecomposition phase diagram+ how many phases are present when the system is at e3uilibrium

1

&

:

?

'upple#ental Question 'olvus line

Correct" A solvus line separates which of the following pairs of phase fields


O and i3uid N O

O and ON 


#1 (take note, diferent values given) swerte i same given d2 kasi tama to :D

#3, di ko sure yung Part 2 & onwardssad



Problem 2.18

Correct" The net potential energy between two ad0acent ions+ E N+ may be represented by

Where A, B, and n are constants whose values depend on the particular ionic system. Calculate the bonding energy E 1 in terms of the parameters A+ B+ and n using the following procedure2 (1) $ifferentiate E N with respect to r + and then set the resulting e'pression e3ual to (ero+ since the curve of E N versus r is a minimum at E 1" (2) Solve for r in terms of A+ B+ and n+ which yields r 1+ the e3uilibrium interionic spacing" (3) $etermine the e'pression for E 1 by substitution of r 1 into the above e3uation for E N" Which of the following e3uations represents the e'pression for E 1

Problem <":; ,K% MultistepA cylindrical rod &11 mm long and having a diameter of &1"1 mm is to be deformed using a tensile load of :J+@11 6" It must not e'perience either plastic deformation or a diameter reduction of more than J"@/&1? mm" %f the materials listed as follows+ which are possible candidates Fustify your choice,s-" Material

Modulus of Elasticity(GPa)

Yield Strength (MPa)

Poisson's Ratio

#$

2$$

$&&

Brass allo

'$'

&$$

$&(

Steel allo

2$#

($$

$&$

)itanium allo

'$#

*$

$&(

Aluminum allo

Part 1

#'cellent What is the stress in MPa in the cylindrical rod

,

.

350

MPa




Poisson's Ratio

#$

2$$

$&&

Brass allo

'$'

&$$

$&(

Steel allo

2$#

($$

$&$

)itanium allo

'$#

*$

$&(

Aluminum allo

Part 2

Well done Which materials would be acceptable for this design based upon the answer to Step %ne ,Select all materials that are acceptable"-

steel alloy

titanium alloy

aluminum alloy

brass alloy




Poisson's Ratio

#$

2$$

$&&

Brass allo

'$'

&$$

$&(

Steel allo

2$#

($$

$&$

Aluminum allo

)itanium allo

'$#

*$

$&(

Part 3

#'cellent Calculate the change in diameter+ Vd + in mm+ for each of the alloys the meet the first design criterion as determined in Steps & and :" What is Vd + in mm+ for the2 a) steel alloy ) titanium alloy

a)

Vd .

)

Vd .

-0.0051

mm

-0.0111

mm




Poisson's Ratio

#$

2$$

$&&

Brass allo

'$'

&$$

$&(

Steel allo

2$#

($$

$&$

)itanium allo

'$#

*$

$&(

Aluminum allo

Part 4

#'cellent Which of the steel and titanium alloys also meets the second criterion

neither alloy

both alloys

steel alloy

titanium alloy

%role# 19!13

Correct" To what temperature ,in HC- must a cylindrical rod of one metal &1"1=: mm in diameter and a plate of second metal having a circular hole "=@ mm in diameter have to be heated for the rod to 0ust fit into the hole Assume that the initial temperature is :;HC and that the linear e'pansion coefficient values for metals one and two are ;"= ' &1< ,HC-& and &= ' &1< ,HC-&+ respectively" 762.561

HC

Question 3: %art 1

$etermine the relative amounts ,in terms of volume fractions- for a &@ wtG Sn=@ wtG Pb alloy at &11HC" The densities of tin and lead at &11HC are given as follows2

Sn .

J": gEcm?

Pb .

&&":J gEcm?

4ou 4ou may also want to use Animated >igure "=" "="

%art 1

4our answer is correct" What phase,s- is,are- present for an alloy of this composition See Animated >igure "=

alpha N li3uid phases

beta phase

beta N li3uid phases

li3uid phase

alpha phase

alpha N beta phases

Question 4

Correct" Which of the following 8inds of information may be determined with the aid of a phase diagram

The fraction,s- of phase,s- present at specified temperature and composition"

The phase,s- present at a specified temperature and composition"

The composition,s- of phase,s- present at a specified temperature and composition"

Question 5


O and ON 



O and i3uid N O

Question 6




O and i3uid N O

O and ON 

Question 7

4our answer is correct" >rom the list below+ select four situations in which casting is the preferred fabrication techni3ue" (1) When (2) >or

the processing would be very precise

large pieces andEor complicated shapes

(3) When

mechanical strength is not an important consideration

(4) >or

metals having high melting temperatures

(5) >or

alloys having low ductilities

(6) When

it is the most economical fabrication techni3ue

(2)+ (3)+ (5)+ (6)

(1)+ (2)+ (4)+ (6)

(1)+ (3)+ (4)+ (5)

(2)+ (3)+ (4)+ (6)

(1)+ (2)+ (4)+ (5)

Question 8

Correct" >orging operations normally ta8e place at

)igh temperatures

!oom temperature

ow temperatures

Question 9

Correct" Which of the following are forming operations

Welding

#'trusion

Continuous casting

!olling

$rawing

$ie casting

Powder metallurgy

>orging

Question 10

4our answer is correct" Is it possible to grind up and reuse phenolformaldehyde

4es+ it is possible"

6o+ it is not possible"

Question 11

Correct" )ow does the electron structure of an isolated atom differ from that of a solid material +nser

An isolated atom has states"

an electron band structure " Solid materials have discrete electron energ

An isolated atom has discrete electron energ states " Solid materials have electron band structures "

Question 12

Correct" Which of nSe and CdTe has the larger band gap energy

nSe

CdTe

Question 13

Correct" Which type of charge carrier will be introduced into a semiconductor by the presence of an acceptor impurity

#lectron

)ole

Question 14

Correct" Which type of charge carrier will be introduced into a semiconductor by the presence of a donor impurity

)ole

#lectron

Question 15

Correct" >or a semiconductor+ when an electric field is applied+ in which direction are the holes accelerated

%pposite to the direction of the electric field"

In the same direction as the electric field"

Question 16

Correct" The electrical conductivity of an e'trinsic semiconductor is



Question 17

Correct" Are energies for electrons that participate in the conduction process ,i"e"+ free electrons- greater or less than the >ermi energy

Kreater than

ess than

Question 18

Correct" Are energies for holes greater or less than the >ermi energy

Kreater than

ess than

Question 19

Correct" An insulator has an energy band gap that is relatively

wide"

narrow"

Question 20

Correct" The electrical conductivity of an intrinsic semiconductor is



Question 21

Correct" )ow do the electrical conductivities of metals compare with those of semiconductors

QMetals R QSemiconductors

QMetals .QSemiconductors

QMetals  QSemiconductors

Question 22

Correct" >or an ntype semiconductor+ which type of charge carrier is present in the greater concentration

)ole

#lectron

Question 23

Correct" >or an ntype semiconductor




Question 24

Correct" >or a !type semiconductor+ which type of charge carrier is present in the greater concentration

#lectrons

)oles

Question 25

Correct" >or a !type semiconductor




Question 26

Correct" In order for a semiconductor to e'hibit e'trinsic electrical characteristics+ relatively high impurity concentrations are re3uired"

True

>alse

Question 27

Correct" A semiconductor has an energy band gap that is relatively

wide"

narrow"

Question 28

Correct" )ow does increasing temperature affect the concentration of both electrons and holes in an intrinsic semiconductor

May increase andEor decrease the concentration+ depending on the temperature range"

Increases the concentration"

$ecreases the concentration"

Question 1

Correct 9sing Animated >igure "=+ determine which of the phasesEphase combinations listed below will be present for an alloy of composition ;< wtG Sn  @; wtG Pb that is at e3uilibrium at ;;HC

alpha N beta

li3uid


alpha

beta

alpha N li3uid

beta N li3uid

Question 2

Correct 9sing the Animated >igure "=+ determine which of the phasesEphase combinations listed below will be present for an alloy of composition JJ wtG Sn  :? wtG Pb that is at e3uilibrium at &1HC

alpha N li3uid

li3uid


alpha

beta N li3uid

alpha N beta

beta

Question 3

Correct 9sing the Animated >igure "=+ for an alloy of composition :@ wtG Sn  J@ wtG Pb+ select the phase,s- present and their composition,s- at :11HC"

α .

&="? wtG Sn  =&"J wtG PbU β . J"= wtG Sn  :": wtG Pb

α .

&J wtG Sn  =? wtG PbU β . @@"J wtG Sn  ;;"? wtG P

O . &J wtG Sn  =? wtG PbU " . @@"J wtG Sn  ;;"? wtG Pb

" .

:@ wtG Sn  J@ wtG PbU α . :@ wtG Sn  J@ wtG Pb

Question 4

Correct A eutectoid reaction involves which of the following phases



Three solid


Question 5


β and γ phases

β' and γ phases

i3uid phase

α phase

β phase

Question 5


β and γ phases

β' and γ phases

i3uid phase

α phase

β phase

7uestion =

4our answer is correct" The mass fraction of eutectoid cementite in a h!er eutectoid ironcarbon alloy ,0ust below its eutectoid temperature- is 1"&11" %n the basis of this information+ determine the composition of the alloy" If it is not possible to determine the composition from the information provided+ enter 1"

wtG C

1.32502

Question 9

4our answer is incorrect" The mass fraction of eutectoid ferrite in a h!er eutectoid ironcarbon alloy ,0ust below its eutectoid temperature- is 1"=@=" %n the basis of this information+ determine the composition of the alloy" If it is not possible to determine the composition from the information provided+ enter 1"

wtG C

0.7338

Question 10

Correct" A eutectoid reaction involves which of the following phases




Three solid

Question 11


O and ON 



O and i3uid N O

Question 12

Incorrect" A peritectic reaction involves which of the following combinations of phase fields




Three solid

Question 13

Correct" At a eutectic point on a binary temperaturecomposition phase diagram+ how many phases are present when the system is at e3uilibrium

1

&

:

?

Question 14



O and ON 


O and i3uid N O

"o#ponent of $aterial


Processing

Crystallinity

Properties

Performance



Mechanical

#lectrical

)eat Transfer

%ptical



Anisotropic

Bitropic

Isotropic

Multitropic

none of the above

$aterials 'cience an nineerin

&"Tries to create a new material with the desired properties based on an e'isting material with similar properties


Industrial #ngineer

Civil #ngineer

Chef



Composite

Plastics

Alloys

Metals



Polymers

Ceramics

Metals

Composites



Mechanical

#lectrical

Thermal

$eteriorative

"haracteristics of $aterials






none of the above

*orces in +to#s




The buoyant force

The resultant force

+to#ic $oel


Bohr atomic model

!utherford*s model

7uantum theory

String theory

T&pes of ,ons


Metallic bond

Ionic bond

Covalent bond

Capillary bond

,ons in +to#s


Covalent bond

Metallic bond

Mechanical bond

Ionic bond

none of the above

+to#s in *"" 'tructure

)ow many atoms can be contained in an >CC structure

&

:

?

;

'tructure of *""

If the radius of a face centered cubic crystal is half the length of its unit cell edge+ then the relationship of the >CCs radius and edge length is

a.pi!D:

a.!

a.:"@!

6one'istent because the structure cannot be formed

none of the above

'tructure of ,""

If the radius of the body centered cubic crystal is S7!T,?- Angstrom ,A- then the unit edge is

:A

;A

?A

&
+to#s in e.aonal '&ste#s


:

;

<

=

,asic ,uilin ,loc/ of "r&stal 'tructure


Building unit

Cubicle

Crystal cell

9nit cell

e lenth an aius of the +to#

If the radius of a face centered cubic crystal is & Angstrom ,A-+ then the unit edge is

a.!D:

a.:

a.&

a.:S3rt,:-

$echanical %ropert&


inear Point


>ailure Point


none of the above

$echanical %ropert&

The slope of the linear part of the stressstrain curve in the elastic region"

4oung*s Modulus

Tensile Modulus

Strain Modulus

none of the above

$echanical %ropert&


%hm*s aw

4oung*s aw

)oo8e*s aw

none of the above

$echanical %ropert&


>racture



Brea89p Point

none of the above

$echanical %ropert&


%hm*s Modulus

4oung*s Modulus


none of the above

$echanical %ropert&


Stress

Strain

Tensile >orce

Shear >orce

none of the above

$echanical %ropert&


4oung*s !atio

Capacitive !atio

Poisson*s !atio

none of the above


!eaction in which the electrons from the anodic region is transferred and become part of another chemical species

%'idation

!eduction

#lectromigration

Superconduction

none of the above

.iation

This process will form nonmetallic films or scales in metals

%'idation

!eduction

#lectromigration

Superconduction

none of the above


This process will result in the loss of electrons in metals

%'idation

!eduction

#lectromigration

Superconduction

none of the above



!esistance

!esistivity

Conductance

Capacitance

none of the above



Capacitive aw

Mho*s aw

%hm*s aw

!esistive aw

none of the above

h#s a


::": ohms

::1 ohms

:": ohms

1"@ ohms

none of the above

"apacitance


%hms

>arad

olts

Amperes

none of the above

"apacitance


oltage

!esistance

Inductance

Capacitance

none of the above

Ther#al %ropert&

Stress induced in a body as a result of slow changes in temperature

Thermal Shoc8

Thermal Stress

Thermal annealing

Thermal Tempering

none of the above

Ther#al %ropert&

If the change in temperature of a certain & meter aluminum wire is &11 deg Celsius+ what is the change in its length ,Alpha . :?"< ' &1D
:?"< ' &1D; m

:?"< ' &1D; m

:"?< ' &1D; m

1":?< ' &1D; m

none of the above

Ther#al %ropert&

It represents the amount of energy re3uired to produce a unit temperature rise"

)eat Capacity

Calories

)eat

Foule

none of the above

$anetic %ropert&

This 8ind of magnetic field is wea8 and attracts towards the e'ternal magnetic field applied to the material

$iamagnetic

Paramagnetic

>errimagnetic

>erromagnetic

none of the above

$anetic %ropert&

This 8ind of magnetic field is strong and e'ists even without the presence of e'ternal magnetic field

Paramagnetic

>erromagnetic

$iamagnetic

none of the above

$anetic %ropert&

This 8ind of magnetic field is wea8 and opposes the e'ternal magnetic field applied to the material

$iamagnetic

Paramagnetic

>errimagnetic

>erromagnetic

none of the above

ner& of iht

If the fre3uency of the light source is &1 hert(+ the energy of the light is

<"
?"?? ' &1D< F

?"?? ' &1D? F

<"

$escribes how light propagates through a medium

!efractive Inde'

!eflective Inde'

Capacitance

Inde' of luminosity

none of the above


Phenomenon wherein the absorbed energy of the material is reemitted as visible light" The interval between absorption and reemission is greater than & second

uminiscence

Transluscence

Phosphorescence

Transparence

none of the above


Materials that are capable of transmitting light with relatively little absorption and reflection

Phosphorescent

Transparent

%pa3ue

>lourescent

none of the above

'pee of iht

If the wavelength of light is & ' &1D= m+ its fre3uency is

&E? m

?m

All in (Repaired)

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