Turning answer bank into flashcards
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| SONAR is an acronym for [_____] | show 🗑
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| Which is NOT an acoustic system? [Active SONAR, Seismic, Passive, Metric, Underwater Comms & Telemetry] | show 🗑
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| show | Electric, sound
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| show | True
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| show | Ohm's Law
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| show | Intensity
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| show | Figure of Merit
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| [T/F]: The Performance Figure is defined as the difference between the SL and NL measured at the TRANSDUCER | show 🗑
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| The following equation applies to a SONAR system that is [____]: SL - 2TL + TS = NL - DI + DT | show 🗑
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| What are the differences between the Active & Passive SONAR equations? | show 🗑
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| show | True
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| show | One micropascal
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| An underwater acoustic hydrophone converts [____] energy into [____] energy. | show 🗑
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| show | 1) Ideal gas law, conservation of mass
2) Continuity equation, Euler equation
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| Name 2 common sources of ambient noise underwater | show 🗑
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| Volume reverberation is mainly caused by [sea surface, sea bottom, marine life, shallow water] | show 🗑
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| The following term is used IN the computation of the detection threshold for a SONAR system. What does the d stand for? What does that represent? d = (mu_s+n - mu_n)^2/(0.5(sigma_s+n^2 + sigma_n^2)) | show 🗑
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| show | a, c, & d; NOT b
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| show | True
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| show | Acoustic pressure
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| In the given equation, rho*c is often referred to as [____]: p = rho*c*u | show 🗑
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| show | Passive reverberation is NOT real
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| A company needs to evaluate where they should drill an oil exploration well in deepwater. Which system is most applicable? [Side scan SONAR, sub-bottom profiler, Seismic, CHIRP] | show 🗑
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| When studying sea sound propogation, the given equation is decribed by which law? cos(theta_2)/cos(theta_1) = c_2/c_1 [Ideal gas, Snell's, Euler's, Wave equation] | show 🗑
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| What are the 4 layers of a typical velocity profile? In order from free surface to seafloor. | show 🗑
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| show | 1) Viscosity of pure water
2) Molecular relaxation of magnesium sulfate > 100 kHz
3) Molecular relaxation of boric acid > 100 kHz
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| What is the name of the widely used relation for evaluating absorption in the ocean, as a sum of the effects of boric aid, magnesium sulfate, and pure water? [D'Alembert, Francois-Garrison, Bernoulli, Euler-LaGrange] | show 🗑
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| show | N = 10 log(actual level/ref. level) = 10log(500/1) = 27 dB re 1 muPa
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| [T/F]: It is important to keep all units consistent when solving for intensity and pressure | show 🗑
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| show | SL - 2TL + TS = NL - DI + DT -> TL = 0.5(180 + 50 - 20 + 10 - 25) = 97.5 dB re 1 muPa @ 1 yd.
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| show | SL - 2TL + TS = RL + DT
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| How do you change the reference pressure? | show 🗑
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| show | Ambient NL is never related to equipment (at least, not related to the equipment involved in the sound wave exchange)
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| Which is NOT a medium related parameter? [RL, Ambient NL, TL, TS] | show 🗑
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| show | True
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| For a perfectly coherent signal & partially coherent noise, AG is expressed as the following: AG = 10log(n/(1+(n-1)*rho)) What is n? [Euler's density factor, # of elements in array, NL, frequency coefficient] | show 🗑
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| show | Longitudinal, propogation
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| An offshore installation contractor is required to place a subsea structure on the seabed in deep water. Which system should they use that's independent of depth? [USBL, LBL, Hydrophone array, Side scan SONAR] | show 🗑
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| show | True I guess? What's the truth, there's no theta_c or there is theta_c? Are we talking about different sound rays here? Badly worded question smdh.
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| show | Time
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| show | Machinery noise is not ambient.
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| Sources of radiated noise include which of the following? [Machinery, propeller, hydrodynamic, thermal] | show 🗑
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| show | Side scan SONAR is used to search the seafloor
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| show | Steradian
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| show | True
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| show | Sub-bottom profilers penetrate up to about 100 m below seabed.
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| [T/F]: A shadow zone occurs at a depth where the sound velocity is maximum. | show 🗑
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