EDELMAN'S SPI EXAM QUESTIONS AND DETAILED CORRECT ANSWERS WITH RATIONALES
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Edelmen's SPI Exam Review Test, 222 Questions and
Correct Answers, With Complete Solution, Updated 2024.
Sound waves are:
a) electric
b) mechanical, transverse
c) spectral
d) longitudinal, mechanical
D
The speed of sound of ultrasound in soft tissue is closest to:
a) 1,540 km/sec
b) 1.54 km/sec
c) 1,500 m/s
d) 1,540 mm/sec
C
Which is not an acoustic variable?
a) density
b) pressure
c) distance
d) intensity
D
The effects of soft tissue on ultrasound are called:
a) acoustic proliferation properties
b) dynamic effects
c) acoustic propagation properties
d) biological effects
C
All of the following are true EXCEPT:
a) two waves with identical frequencies must interfere constructively.
b) constructive interference is associated with waves that are in-phase.
c) out-of-phase waves interfere destructively.
d) waves of different frequencies may exhibit both constructive and destructive interference at
different times.
A
Put in decreasing order:
a) deca
b) deci
c) micro
d) centi
,abdc
______ is the time to complete one cycle
a) pulse duration
b) pulse period
c) period
d) duration period
C
Which of the following sound waves is ultrasonic and least useful in diagnostic imaging?
a) 30 KHz
b) 8 Mhz
c) 8,000 Hz
d) 3,000 Hz
e) 15 Hz
A
______ is the distance covered by one cycle.
a) pulse length
b) wavelength
c) cycle distance
d) cycle duration
B
Which of the following is determined by the source and the medium?
a) frequency
b) period
c) propagation speed
d) range resolution
D
Propagation speed = _______ x wavelength
a) pulse duration
b) period
c) # of cycles in the pulse
d) frequency
D
As a result of _____ the propagation speed increases.
a) increasing stiffness and increasing density
b) increasing stiffness and increasing elasticity
c) decreasing compressibility and decreasing density
d) decreasing stiffness and decreasing density.
C
,Put in decreasing order of propagation speed.
a) gas
b) liquid
c) solid
cba
If the frequency of an ultrasound wave is doubled, what happens to the period?
a) doubles
b) halved
c) remains the same
d) 4x greater
B
The units of pulse repetition frequency are:
a) per minute
b) microseconds
c) mm/microseconds
d) MHz
A
The time from the beginning of the pulse to the end of that pulse is _______?
a) period
b) pulse duration
c) pulse length
d) PRF
B
What happens to the speed of sound in a medium when the bulk modulus increases?
a) faster
b) slower
c) unchanged
A
_________ resolution is determined by the spatial pulse length
a) radial
b) image
c) axial
d) angular
A or C
If the wave's amplitude is doubles, what happens to the power?
a) nothing
b) halved
, c) doubled
d) quadrupled
D
If the level of acoustic variable ranges from 55-105, what is the amplitude?
a) 105
b) 50
c) 25
d) 55
25
Power of sound has units of:
a) dB
b) dB/cm
c) watts
d) watts/cm^2
C
If the intensity of a sound beam remains unchanged while the beam area is reduced in half, what has
happened to the power?
a) quadrupled
b) doubled
c) halved
d) unchanged
C
Which of these intensities is the smallest?
a) SATP
b) SPTP
c) SATA
C
The duty factor for CW ultrasound is
a) 10.0
b) 1%
c) 1.0
d) 0.0%
C
What is the minimum value of the duty factor? a) 10.0
b) 1%
c) 1.0
d) 0.0%
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