Degaussing Flashcards
Degaussing systems are used aboard ship for which of the following reasons?
To help reduce the ships distortion of the earths magnetic field
Magnetic lines of force interact with ferrous materials in what way?
They distort the background field into areas of increased or decreased magnetic strength
The earth’s magnetic field lines of force enter the surface at what location?
The south magnetic pole
The earths magnetic field is made up of what components?
The H and Z zones
The magnitude of a ships permanent magnetism depends on which of the following conditions?
the earths magnetic field at the place where the ship was built
Navy ships are depermed for which of the following reasons
To decrease the permanent magnetization of the ship
A ship’s induced magnetism depends on which of the following components?
The strength of the earths magnetic field
The magnitude of the vertical field component of a ship’s induced magnetization depends on what factor?
Magnetic latitude
What type of information is located in the degaussing folder?
Magnetic treatment of the ship
At what point is the degaussing folder prepared?
During initial calibration
Where is the equipment that measures the magnetic field of a ship, at a degaussing range typically located?
At or near the bottom of the channel
A ship is check ranged for which of the following reasons?
To ensure the current settings are adequate
What type of power source energizes degaussing coils?
Direct current
Which of the degaussing coils encircle the ship, usually at the water line
M
Which of the following degaussing coils encircles the forward one-fourth to one-third of a ship?
F
The FI-QI degaussing coils counteract which of the following fields?
Longitudinal induced magnetism
What equipment is used to automatically control the current of the degaussing system?
Gyrocompass and magnetometer
A magnetometer that controls the induced field currents receives a signal from what total number of axes?
Three
Magnetometer-controlled AUTODEG equipment has what total number of modes of operation?
Two
In the event of loss of gyro signal to gyro-controlled AUTODEG equipment, the operator can adjust the current for which if the following coils?
A and FI-QI
What naval ships’ technical manual chapter contains detailed information on markings used in the degaussing systems?
475
What method is used to mark the insulating sleeving of degaussing conductors?
Branding
Inside of a connection box, what is the required length for all conductors?
1 and one half times the length to the farthest terminal
What method is the fastest and easiest way to check connection boxes or through boxes for moisture?
Remove the drain plug
