DMS 100 FINAL EXAM QUESTIONS
WITH CORRECT SOLUTIONS
Sound eewaves eesent eeout eeof eea ee- eeAnswer eeTransducer
Infrasound eeis eesound eewith eea eefrequency eeof ee- eeAnswer ee< ee20 eeHertz
Audible eesound eeis eesound eewith eea eefrequency eeof ee- eeAnswer ee20-20,000 eeHertz
Ultrasound eeis eesound eewith eea eefrequency eeof ee- eeAnswer ee> ee20,000 eeHertz
Ultrasound eefrequencies eeused eefor eeDMS eeclasses ee- eeAnswer ee1-15 eeMHz eerange
One eecycle eeper eesecond ee- eeAnswer eeHertz ee(Hz)
Oscillation eeor eevibration ee- eeAnswer eeCycle
Kilohertz ee= ee__________ eeHz ee- eeAnswer ee1000
Megahertz ee= ee___________ eeHz ee- eeAnswer ee1,000,000
Distance eetraveled eeby eeone eecycle ee- eeAnswer eeWavelength
Higher eefrequencies eehave ee__________ eewavelengths eeand eeare eeattenuated
ee_____________ ee- eeAnswer eesmaller, eeeasier
Lower eefrequencies eehave ee___________ eewavelengths eeand eeare eeare eeattenuated
ee____________ ee- eeAnswer eelonger, eeless eeeasy
The eereduction eeis eethe eeamplitude eeand eeintensity eeof eea eesound eewave eeas eeit
eepropagates eethrough eea eemedium ee- eeAnswer eeAttenuation
What eecauses eeattenuation ee- eeAnswer eeAbsorption, eescattering, eeand eereflection
Sound eewaves eetravel eethrough eematter eeby eecausing ee_____________ ee- eeAnswer
eevibrations eealong eethe eepath
Another eename eefor eetraveling eethrough eematter ee- eeAnswer eepropagate
High eepart eeof eea eewave ee- eeAnswer eecompressions eeor eecondensations
Lower eepart eeof eea eewave ee- eeAnswer eeRarefactions
, The eestiffness, eeelasticity, eeand eedensity eeof eethe eematerial eedetermine eethe ee-
eeAnswer eePropagation eespeed
The eemajor eecomponent eeof eean eeUltrasound eetransducer eeis eethe
ee__________________ ee- eeAnswer eePiezoelectric eeelement ee(PZT eecrystal)
The eeproperty eeexhibited eeby eethe eecrystals eein eethe eeUS eetransducer eethat
eetransform eeelectrical eeenergy eeinto eesound eeand eesound eeback eeto eeelectrical
eeenergy ee- eeAnswer eePiezoelectric eeEffect
Special eematerial eethat eehas eethe eeability eeto eeconvert eeelectrical eeimpulses eeinto
eesound eewaves ee- eeAnswer eeCrystal
Modern eecrystals eemade eefrom ee- eeAnswer eeCeramic
Original eecrystals eemade eefrom ee- eeAnswer eeQuartz
Any eedevice eethat eeconverts eesignals eefrom eeone eeform eeto eeanother ee- eeAnswer
eeTransducer
Continuous eewave eetransducer eehas ee__________ eecrystals ee
What eedo eethey eedo? ee- eeAnswer ee2, ee1 eefor eesending eeand ee1 eefor eereceiving
Pulsed eewave eetransducer eehas ee____________ eecrystals ee
What eedo eethey eedo? ee- eeAnswer ee1, eeboth eesending eeand eereceiving
Transducers eeemit eea eerange eeof eefrequencies eecalled eethe ee_____________ ee-
eeAnswer eeband eewidth
The eehigher eethe eefrequency, eethe ee__________ eethe eeresolution eeor eedetail ee-
eeAnswer eebetter
The eelower eethe eefrequency, eethe ee___________ eethe eepenetration ee- eeAnswer
eedeeper
the eeability eeto eedistinguish eebetween ee2 eeadjacent eestructures ee- eeAnswer
eeResolution
Small eetransducer eeelements eeelectronically eecoordinated eeto eeproduce eea
eerectangular eeimage ee- eeAnswer eeLinear eearray
Curved eescanning eehead eeand eeelectronic eefocusing ee- eeAnswer eeCurved eearray
Small eetransducer eehead eethat eeproduced eea eepie-shaped eeimage ee- eeAnswer
eeSector
WITH CORRECT SOLUTIONS
Sound eewaves eesent eeout eeof eea ee- eeAnswer eeTransducer
Infrasound eeis eesound eewith eea eefrequency eeof ee- eeAnswer ee< ee20 eeHertz
Audible eesound eeis eesound eewith eea eefrequency eeof ee- eeAnswer ee20-20,000 eeHertz
Ultrasound eeis eesound eewith eea eefrequency eeof ee- eeAnswer ee> ee20,000 eeHertz
Ultrasound eefrequencies eeused eefor eeDMS eeclasses ee- eeAnswer ee1-15 eeMHz eerange
One eecycle eeper eesecond ee- eeAnswer eeHertz ee(Hz)
Oscillation eeor eevibration ee- eeAnswer eeCycle
Kilohertz ee= ee__________ eeHz ee- eeAnswer ee1000
Megahertz ee= ee___________ eeHz ee- eeAnswer ee1,000,000
Distance eetraveled eeby eeone eecycle ee- eeAnswer eeWavelength
Higher eefrequencies eehave ee__________ eewavelengths eeand eeare eeattenuated
ee_____________ ee- eeAnswer eesmaller, eeeasier
Lower eefrequencies eehave ee___________ eewavelengths eeand eeare eeare eeattenuated
ee____________ ee- eeAnswer eelonger, eeless eeeasy
The eereduction eeis eethe eeamplitude eeand eeintensity eeof eea eesound eewave eeas eeit
eepropagates eethrough eea eemedium ee- eeAnswer eeAttenuation
What eecauses eeattenuation ee- eeAnswer eeAbsorption, eescattering, eeand eereflection
Sound eewaves eetravel eethrough eematter eeby eecausing ee_____________ ee- eeAnswer
eevibrations eealong eethe eepath
Another eename eefor eetraveling eethrough eematter ee- eeAnswer eepropagate
High eepart eeof eea eewave ee- eeAnswer eecompressions eeor eecondensations
Lower eepart eeof eea eewave ee- eeAnswer eeRarefactions
, The eestiffness, eeelasticity, eeand eedensity eeof eethe eematerial eedetermine eethe ee-
eeAnswer eePropagation eespeed
The eemajor eecomponent eeof eean eeUltrasound eetransducer eeis eethe
ee__________________ ee- eeAnswer eePiezoelectric eeelement ee(PZT eecrystal)
The eeproperty eeexhibited eeby eethe eecrystals eein eethe eeUS eetransducer eethat
eetransform eeelectrical eeenergy eeinto eesound eeand eesound eeback eeto eeelectrical
eeenergy ee- eeAnswer eePiezoelectric eeEffect
Special eematerial eethat eehas eethe eeability eeto eeconvert eeelectrical eeimpulses eeinto
eesound eewaves ee- eeAnswer eeCrystal
Modern eecrystals eemade eefrom ee- eeAnswer eeCeramic
Original eecrystals eemade eefrom ee- eeAnswer eeQuartz
Any eedevice eethat eeconverts eesignals eefrom eeone eeform eeto eeanother ee- eeAnswer
eeTransducer
Continuous eewave eetransducer eehas ee__________ eecrystals ee
What eedo eethey eedo? ee- eeAnswer ee2, ee1 eefor eesending eeand ee1 eefor eereceiving
Pulsed eewave eetransducer eehas ee____________ eecrystals ee
What eedo eethey eedo? ee- eeAnswer ee1, eeboth eesending eeand eereceiving
Transducers eeemit eea eerange eeof eefrequencies eecalled eethe ee_____________ ee-
eeAnswer eeband eewidth
The eehigher eethe eefrequency, eethe ee__________ eethe eeresolution eeor eedetail ee-
eeAnswer eebetter
The eelower eethe eefrequency, eethe ee___________ eethe eepenetration ee- eeAnswer
eedeeper
the eeability eeto eedistinguish eebetween ee2 eeadjacent eestructures ee- eeAnswer
eeResolution
Small eetransducer eeelements eeelectronically eecoordinated eeto eeproduce eea
eerectangular eeimage ee- eeAnswer eeLinear eearray
Curved eescanning eehead eeand eeelectronic eefocusing ee- eeAnswer eeCurved eearray
Small eetransducer eehead eethat eeproduced eea eepie-shaped eeimage ee- eeAnswer
eeSector
