ASW Flashcards
Which ASW system is used to increase the capability to detect submarines by evaluation MAD signals and separating submarine anomaly from magnetic noise?
SAD
Sub Anomaly Detector
Which ASW system equipment is used to reduce the effects of unwanted magnetic disturbances?
MAD compensator
you MUST use special nonferrous tools on what unit of the typical MAD system?
Amplifier power supply
Variations in the earths magnetic field strength causing changes in the quantity of light passing through helium gas is the principle of what ASW equipment?
Solid-state magnetomer
what term best describes how a state of total balance of magnetic forces around a magnetometer is achieved?
Compensation
what term is used to describe magnetic variations is an east-west direction
Dip
What SONAR set operational mode produces acoustic pulses that are radiated through the water from the dome projector?
echo ranging
what dome unit converts electrical pulses to acoustic pulses?
projector
what type of motor is used to raise and lower the sonar dome?
hydraulic
what is the maximum number of usable feet of the special purpose cable used to an airborne sonar system?
450 feet
what airborne sonar major unit displays target echoes and provides direct readouts of bearing and range information?
Azimuth and range indicator
what sonar set operating mode should be used to communicate with similarly equipped helicopters, submarines, or surface vessels?
communicate
what sonar set operation mode should be used to search for possible targets without alerting the target?
Passive
what sonar set operation mode provides the operator with information useful in determining optimum search depth?
Bathythermograph
what principle describes why certain ceramic dielectrics deform when an electric field is applied?
electrostrictive
what principle describes why certain crystals produce charges of electricity under mechanical stress?
piezoelectric
what principle describes why certain metals shrink or contract when placed in magnetic field?
Magnetostrictive
the primary function of a transducer is to…?
transmit underwater sound only.
what is the primary function of a hydrophone?
receive underwater sound only
what term best describes the change of pitch from a returning echo caused by relative motion between the sound source and the reflective surface?
doppler effect
what term best describes a region in seawater where a relatively rapid decrease in temperature occurs?
thermocline
what seawater characteristic most often affects the speed of sound in water?
Salinity
what characteristic of sound best describes the effect of the speed of sound in seawater changing as the water temperature changes?
Refraction
what characteristic of sound best describes why a weak signal is found the further one gets from a point source of sound?
divergence
What characteristic of sound best describes an echo?
reverberation
What signal strength losses is caused by the effect of water on a sound beam as it travels through water?
Transmission signal
What sonobuoys is considered a listen only ASW sonobuoy?
DIFAR
What type of information is send via VHF radio signals from the sonobuoy to the deploying aircraft?
Tactile
What acronym is used to refer to a weapons system that finds and destroys submarines?
ASW
