船用回声测深仪（echo sounder）Haihe educational park, making friends and entertainment community - Forum on Haihe Education Park http:/www.buanfen.comThe third chapter ship echo echo sounderThe echo sounder actually measures the ultrasonic waves coming and going to the bottom of the ocean.A. speedB. depthAnswer: C. timeD. distanceThe echo sounder is.A. audio sound pulseB. audio sound continuous waveC. continuous ultrasonic waveAnswer: D. ultrasonic pulseThe minimum measuring depth of an echo sounder depends on.A. pulse periodB. emission frequencyC. sound propagation velocityAnswer: D. transmit pulse widthThe maximum measurement depth of a marine echo sounder depends on.Answer: A. transmit pulse repetition cycleB. transmit pulse widthInstallation position of C. transducerD. emission trigger modeThe depth of echo measured by echo sounder is equal to that of ultrasonic return time t. The relationship between T and the repetition period of the transmitted pulse can be displayed properly.Answer: A.t 2TD.t = 4TThe following statement on echo sounder is incorrect.The minimum measuring depth of the A. sounder depends on the width of the transmitted pulseWhen the ship is shaking violently, the B. will not be able to carry out soundingsAnswer: in shallow water bathymetry, the water depth should be read from the back edge of the echo signal band C.D. the vessel shall be moored for long periods of time and shall be electrified every time for half a monthThe depth of the echo sounder is independent of the factors involved.A. emission triggers repeat cyclesB. trigger pulse widthC. emission powerAnswer: D. launch trigger modeThe magnetostrictive receiving transducer must be carried out before or after the initial use, otherwise the sounder will not work properly.A. hysteresisAnswer: B. magnetizationC. polarizationD. intensificationThe depth of water measured by an echo sounder is the depth of water from the bottom of the ocean.A. sounder push deviceAnswer: B. transducer emission surfaceC. waterlineD. sea surfaceThe work surface of the echo transducer can not be painted because the paint will affect the normal working of the sounder.A. corrosion transducer sounding faceB. acts as a barrier to the actuator faceC. makes bubbles on the transducers face and around itAnswer: D. absorbs much of the energy of soundThe principle of an echo sounder is that.A. uses electromagnetic wave propagation in a constant velocity line in water and has the principle of reflecting characteristics to determine the depth of waterAnswer: B. uses the principle of ultrasonic propagation in a constant velocity line in water and the reflection characteristic to determine the depth of waterC. uses the principle of ultrasonic wave propagation at different depths to measure the depth of water by measuring the frequency of transmitting and receivingD.A, B, C are wrongGenerally, the increase of sea water depth will lead to the increase of sea water pressure and the decrease of temperature, and the two will lead to the change of sound speed.A. causes the sound velocity to increaseB. reduces sound speedAnswer: C. almost cancel each other outD. or more is wrongShip echo sounder uses ultrasonic to carry out sounding. The main advantage is that.A. has high propagation speedB. energy loss is smallAnswer: C. anti interference can be heardD. has strong diffractionThe following factors have nothing to do with the speed of sound waves in sea water.Answer: the vibration frequency of the A. sound sourceB. the temperature of the sea waterC. salinity in sea waterD. static pressure of sea waterBecause of the speed of sound, the speed of sound waves in water depends mainly on the surface temperature and salt content of the sea surface.Answer: A. water temperature, water pressure and salt content is proportional toB. water temperature, water pressure and salt content are inversely proportional to each otherC. water temperature is proportional to water pressure and inversely proportional to salt contentD. or above are all wrongShip echo sounder designed and manufactured with m/s as the standard speed of sound, the greatest impact on the sound speed in water is.A.330; temperatureB.1500;Salt contentC.330; salt contentAnswer: D.1500; temperatureThe frequency of the echo sounder refers to the working frequency.A. pulse repetition frequencyB. the interval between pulsesC. the number of pulses per secondAnswer: D. frequency of ultrasonic transmissionThe time at which a 0 point flash on the depth dial of an echo sounder is indicated.Answer: A. ultrasound begins to fireB. ultrasonic begins to receiveC. ultrasonic