EDELMEN'S SPI EXAM REVIEW QUESTIONS AND CORRECT ANSWERS

EDELMEN'S SPI EXAM REVIEW
QUESTIONS AND CORRECT ANSWERS
SoundA2wavesA2are:A2
a)A2electricA2
b)A2mechanical,A2transverseA2
c)A2spectralA2
d)A2longitudinal,A2mechanicalA2-A2Ans--D

TheA2speedA2ofA2soundA2ofA2ultrasoundA2inA2softA2tissueA2isA2closestA2to:A2
a)A21,540A2km/sec
b)A21.54A2km/sec
c)A21,500A2m/sA2
d)A21,540A2mm/secA2-A2Ans--C

WhichA2isA2notA2anA2acousticA2variable?A2
a)A2densityA2
b)A2pressureA2
c)A2distanceA2
d)A2intensityA2-A2Ans--D

TheA2effectsA2ofA2softA2tissueA2onA2ultrasoundA2areA2called:A2
a)A2acousticA2proliferationA2propertiesA2
b)A2dynamicA2effectsA2
c)A2acousticA2propagationA2propertiesA2
d)A2biologicalA2effectsA2-A2Ans--C

AllA2ofA2theA2followingA2areA2trueA2EXCEPT:A2
a)A2twoA2wavesA2withA2identicalA2frequenciesA2mustA2interfereA2constructively.
b)A2constructiveA2interferenceA2isA2associatedA2withA2wavesA2thatA2areA2in-phase.A2
c)A2out-of-phaseA2wavesA2interfereA2destructively.A2
d)A2wavesA2ofA2differentA2frequenciesA2mayA2exhibitA2bothA2constructiveA2andA2destructiv
eA2interferenceA2atA2differentA2times.A2-A2Ans--A

PutA2inA2decreasingA2order:A2
a)A2decaA2
b)A2deciA2
c)A2microA2
d)A2centiA2-A2Ans--abdc

______A2isA2theA2timeA2toA2completeA2oneA2cycleA2
a)A2pulseA2durationA2
b)A2pulseA2periodA2
c)A2periodA2

,d)A2durationA2periodA2-A2Ans--C

WhichA2ofA2theA2followingA2soundA2wavesA2isA2ultrasonicA2andA2leastA2usefulA2inA2diagnos
ticA2imaging?A2
a)A230A2KHzA2
b)A28A2MhzA2
c)A28,000A2HzA2
d)A23,000A2HzA2
e)A215A2HzA2-A2Ans--A

______A2isA2theA2distanceA2coveredA2byA2oneA2cycle.A2
a)A2pulseA2lengthA2
b)A2wavelengthA2
c)A2cycleA2distanceA2
d)A2cycleA2durationA2-A2Ans--B

WhichA2ofA2theA2followingA2isA2determinedA2byA2theA2sourceA2andA2theA2medium?A2
a)A2frequencyA2
b)A2period
c)A2propagationA2speedA2
d)A2rangeA2resolutionA2-A2Ans--D

PropagationA2speedA2=A2_______A2xA2wavelengthA2
a)A2pulseA2durationA2
b)A2periodA2
c)A2#A2ofA2cyclesA2inA2theA2pulseA2
d)A2frequencyA2-A2Ans--D

AsA2aA2resultA2ofA2_____A2theA2propagationA2speedA2increases.A2
a)A2increasingA2stiffnessA2andA2increasingA2densityA2
b)A2increasingA2stiffnessA2andA2increasingA2elasticityA2
c)A2decreasingA2compressibilityA2andA2decreasingA2densityA2
d)A2decreasingA2stiffnessA2andA2decreasingA2density.A2-A2Ans--C

PutA2inA2decreasingA2orderA2ofA2propagationA2speed.A2
a)A2gasA2
b)A2liquidA2
c)A2solidA2-A2Ans--cA2bA2a

IfA2theA2frequencyA2ofA2anA2ultrasoundA2waveA2isA2doubled,A2whatA2happensA2toA2theA2peri
od?A2
a)A2doublesA2
b)A2halvedA2
c)A2remainsA2theA2sameA2
d)A24xA2greaterA2-A2Ans--B

, TheA2unitsA2ofA2pulseA2repetitionA2frequencyA2are:A2
a)A2perA2minuteA2
b)A2microseconds
c)A2mm/microseconds
d)A2MHzA2-A2Ans--A

TheA2timeA2fromA2theA2beginningA2ofA2theA2pulseA2toA2theA2endA2ofA2thatA2pulseA2isA2_____
__?A2
a)A2periodA2
b)A2pulseA2durationA2
c)A2pulseA2lengthA2
d)A2PRFA2-A2Ans--B

WhatA2happensA2toA2theA2speedA2ofA2soundA2inA2aA2mediumA2whenA2theA2bulkA2modulusA2
increases?A2
a)A2fasterA2
b)A2slowerA2
c)A2unchangedA2-A2Ans--A

_________A2resolutionA2isA2determinedA2byA2theA2spatialA2pulseA2length
a)A2radialA2
b)A2imageA2
c)A2axialA2
d)A2angularA2-A2Ans--AA2orA2C

IfA2theA2wave'sA2amplitudeA2isA2doubles,A2whatA2happensA2toA2theA2power?
a)A2nothingA2
b)A2halvedA2
c)A2doubledA2
d)A2quadrupledA2-A2Ans--D

IfA2theA2levelA2ofA2acousticA2variableA2rangesA2fromA255-105,A2whatA2isA2theA2amplitude?A2
a)A2105
b)A250
c)A225
d)A255A2-A2Ans--25

PowerA2ofA2soundA2hasA2unitsA2of:A2
a)A2dBA2
b)A2dB/cm
c)A2watts
d)A2watts/cm^2A2-A2Ans--C

IfA2theA2intensityA2ofA2aA2soundA2beamA2remainsA2unchangedA2whileA2theA2beamA2areaA2is
A2reducedA2inA2half,A2whatA2hasA2happenedA2toA2theA2power?A2
a)A2quadrupledA2