Engineering Material Final Exam Practice
Questions With Correct Answers
Why /do /magnetic /domains /occur /in /ferromagnetic /materials? /- /verified /answer(s)-
✔✔electron /exchange /interaction
The /usable /operating /temperature /a /permanent /magnet /is /limited /by /which /of /the /following?
- verified /answer(s)-✔✔the /curie /temperature
/ /
If /a /magnet /has /a /low /flux /density, /which /of /the /following /is /true? /- /verified /answer(s)-
✔✔the /strength /of /the /magnet /will /be /low
Which /type /of /magnetism /creates /an /opposing /magnetic /field /to /the /externally /applied /field?
- verified /answer(s)-✔✔diamagnetism
/ /
The /operating /point /of /a /magnet /on /the /demagnetization /curve /depends /on /which /of /the
following? /- /verified /answer(s)-✔✔the /permeance /coefficient
/
Which /type /of /magnetism /is /caused /by /a /shift /in /the /e- /of /the /material /due /to /an /externally
applied /magnetic /field? /- /verified /answer(s)-✔✔diamagnetism
/
If /the /dispersion /of /a /material /is /high, /which /of /the /following /is /true? /- /verified /answer(s)-
✔✔chromatic /aberration /will /be /high
The /difference /between /fluorescent /and /phosphorescent /materials /is /which /of /the /following?
- verified /answer(s)-✔✔The /time /for /light /to /be /emitted
/ /
, What /determines /if /total /internal /reflections /will /occur /in /a /material /system? /- /verified
answer(s)-✔✔the /relative /index /of /refraction
/
Which /of /the /following /is /a /material /property /(you /may /choose /more /than /one /answer)? /-
verified /answer(s)-✔✔conductivity /& /resistivity
/
If /the /relaxation /time /in /a /material /increases /then /the /average /drift /velocity /should /- /verified
answer(s)-✔✔increase
/
When /considering /the /conductivity /of /an /extrinsic /semiconductor, /which /conductivity /range
/is /associated /with /the /complete /ionization /of /the /donor /atoms? /- /verified /answer(s)-✔✔the
/exhaustion /range
Which /type /of /primary /bond /is /the /best /for /electrical /conduction? /- /verified /answer(s)-
✔✔metallic
At /very /low /temperatures, /the /___________ /resistivity /dominates /the /total /resistivity /of /a
metal. /- /verified /answer(s)-✔✔residual
/
Doping /a /semiconductor /results /in /which /of /the /following? /- /verified /answer(s)-✔✔an
/extrinsic /semiconductor
Which /of /the /following /explains /why /iron /oxide /not /perform /as /a /passivation /layer /for /iron?
/(you /may /pick /multiple /answers) /- /verified /answer(s)-✔✔-it /is /not /a /barrier /to /oxygen
/diffusion
-the /reaction /products /do /no /have /similar /Coefficients /of /Thermal /Expansion /as /the /iron
-the /reaction /products /do /not /have /a /similar /modulus /to /iron
-the /reaction /products /do /not /form /a /film
Questions With Correct Answers
Why /do /magnetic /domains /occur /in /ferromagnetic /materials? /- /verified /answer(s)-
✔✔electron /exchange /interaction
The /usable /operating /temperature /a /permanent /magnet /is /limited /by /which /of /the /following?
- verified /answer(s)-✔✔the /curie /temperature
/ /
If /a /magnet /has /a /low /flux /density, /which /of /the /following /is /true? /- /verified /answer(s)-
✔✔the /strength /of /the /magnet /will /be /low
Which /type /of /magnetism /creates /an /opposing /magnetic /field /to /the /externally /applied /field?
- verified /answer(s)-✔✔diamagnetism
/ /
The /operating /point /of /a /magnet /on /the /demagnetization /curve /depends /on /which /of /the
following? /- /verified /answer(s)-✔✔the /permeance /coefficient
/
Which /type /of /magnetism /is /caused /by /a /shift /in /the /e- /of /the /material /due /to /an /externally
applied /magnetic /field? /- /verified /answer(s)-✔✔diamagnetism
/
If /the /dispersion /of /a /material /is /high, /which /of /the /following /is /true? /- /verified /answer(s)-
✔✔chromatic /aberration /will /be /high
The /difference /between /fluorescent /and /phosphorescent /materials /is /which /of /the /following?
- verified /answer(s)-✔✔The /time /for /light /to /be /emitted
/ /
, What /determines /if /total /internal /reflections /will /occur /in /a /material /system? /- /verified
answer(s)-✔✔the /relative /index /of /refraction
/
Which /of /the /following /is /a /material /property /(you /may /choose /more /than /one /answer)? /-
verified /answer(s)-✔✔conductivity /& /resistivity
/
If /the /relaxation /time /in /a /material /increases /then /the /average /drift /velocity /should /- /verified
answer(s)-✔✔increase
/
When /considering /the /conductivity /of /an /extrinsic /semiconductor, /which /conductivity /range
/is /associated /with /the /complete /ionization /of /the /donor /atoms? /- /verified /answer(s)-✔✔the
/exhaustion /range
Which /type /of /primary /bond /is /the /best /for /electrical /conduction? /- /verified /answer(s)-
✔✔metallic
At /very /low /temperatures, /the /___________ /resistivity /dominates /the /total /resistivity /of /a
metal. /- /verified /answer(s)-✔✔residual
/
Doping /a /semiconductor /results /in /which /of /the /following? /- /verified /answer(s)-✔✔an
/extrinsic /semiconductor
Which /of /the /following /explains /why /iron /oxide /not /perform /as /a /passivation /layer /for /iron?
/(you /may /pick /multiple /answers) /- /verified /answer(s)-✔✔-it /is /not /a /barrier /to /oxygen
/diffusion
-the /reaction /products /do /no /have /similar /Coefficients /of /Thermal /Expansion /as /the /iron
-the /reaction /products /do /not /have /a /similar /modulus /to /iron
-the /reaction /products /do /not /form /a /film
