Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
73 Cards in this Set
- Front
- Back
|
What problems does the use of pressurized dry air decrease? |
Corrosion, contamination, collection of moisture |
|
|
What are the 3 types of dry air systems? |
I-refridgerant, II-desiccant, III combination of both |
|
|
What piece of equipment is used with the dehydrators in dry air systems? |
Low pressure air compressor |
|
|
What happens to the relative humidity as air is compressed? |
Humidity is increased |
|
|
What is the purpose of having 2 dehydrators on a ship? |
In case of emergencies, one serves as a standby |
|
|
How many dehydrators are installed on large ships? |
Four |
|
|
What controls and regulates pressure to the electronic user equipment? |
Air control panels |
|
|
When are local dehydrators used? |
To remove contaminants, emergency use when battle damaged or casualties result in the failure of the central supply system |
|
|
What result does pressurized dry air have on dielectric (resistance) strength? |
Increase strength of air, and helps prevent corrosion and contamination inside waveguide |
|
|
What delivers very dry clean air for pressurization of equipment waveguides? |
Desiccant air dryer |
|
|
What is is the pose and dew point ratings for HP air? |
20-35 pounds and -40 degrees F |
|
|
What is HP air used to reduce? |
Likelihood of arcing in a waveguide |
|
|
What is the so rating for LP air? |
1-8 psi |
|
|
What is LP air used to prevent? |
Corrosion and contamination |
|
|
What is the moisture probe used for? |
Provides visual readings in parts per million to MONITOR DEW POINT |
|
|
Which moisture removal method freezes the air? |
refrigerant |
|
|
What does the desiccant (absorption) method cause the air to become? |
Electronic dry |
|
|
What does the fluid separator do? |
Extracts or removes most of the free liquids from the air stream |
|
|
What removes oil from the air during the absorption cleaning process? |
Oil filter |
|
|
What is the most important unit of the system |
purifier dehydrator |
|
|
What is used instead of chemicals during the no chemical membrane method process? |
Osmosis (movement of water molecules that reduce its concentration from high to low) |
|
|
What can cause a change in the operating parameters, failure of electronic parts? |
Heat generated from electronic equiptment |
|
|
What does convection rely upon for cooling? |
Natural air flow, requires the equipment enclosure be open construction without air filter |
|
|
What is added to heat producing parts to increase heat dissipation? |
Finned heat sink |
|
|
What is used to draw cool air in during the forced-air-method |
uses a blower |
|
|
What method is used to cool electronic equipment that has airtight sealed components? |
Air-to-air |
|
|
What do air to liquid cooling systems use to shut down equipment to prevent overheating? |
Employ built-in safety devices |
|
|
In the liquid cooling system which loop provides the intitial source of cooling water? |
The primary system |
|
|
What temperature limits are associated with each type of liquid cooling system |
Type I- as high as 95, Type II 90, Type II tighter control of temp range is critical |
|
|
What types of cooling water can be used in the primary and secondary loops? |
Primary sea water or chilled, secondary distilled |
|
|
Where is the SW and CW supplied from? |
Ships seawater service pumps, supplied by ships air conditioning plant |
|
|
What are the 4 components of the primary loop? |
Seawater strainers, chilled water temp valves, flow regulators, heat exchangers |
|
|
What are the two types of seawater strainers? |
simplex and duplex strainers |
|
|
Which strainer requires the water be turned off with the valve before doing maintenance |
Simplex strainer |
|
|
Which type of valve is the CW temperature regulating valve? |
Two way-valve |
|
|
What does the CW temperature regulating valve regulate? |
Flow of chilled water through heat exchanger |
|
|
What is the orifice plate? |
Steel plate with a hold in it, controls the volume of the water |
|
|
What keeps the heat exchanger fully submerged for greater efficiency and heat transfer? |
The constant flow regulator |
|
|
What is the point where the primary and secondary systems come together? |
The heat exchanger |
|
|
Where is the heat that has been absorbed by distilled water flowing through the electronic components in the secondary system is transferred to? |
Primary cooling system |
|
|
Why does a cooling system have 2 heat exchangers? |
One for when malfunctions occur |
|
|
What components make up the secondary loop? |
Distilled water circulating pump, expansion tank, electronic equips being cooled, temp control valves, heat exchangers, demineralized, monitoring equip |
|
|
Why are there 2 DW circulating pumps? |
One designated for service, the other is held in standby |
|
|
What minimizes corrosion and the formation of scale by maintaining the coolant at the high degree of purity? |
Demineralizer |
|
|
What's main purpose is to maintain a desired temperature of distilled water for the electronic equipment? |
temp regulator valve |
|
|
What type of valve is the temperature regulating valve? |
Two or three-way regulating |
|
|
What are the 3 types of flow regulators in the secondary loop? |
Equipment flow, pressure regulator, constant |
|
|
What is the purpose of the expansion tanks? |
Maintains positive pressure on the circulating pumps inlet for proper operation compensates for changes in coolant volume, vents air |
|
|
Which type of expansion tank is located above the highest point in the distilled water system? |
Gravity
|
|
|
Which type of tank uses pressurized air to maintain positive pressure on the pumps? |
Pressurized tank |
|
|
What is 60Hz and 400 Hz power supplied from respectively? |
Service generators, motor generators |
|
|
What is 440v, 60Hz power supplied from respectively? |
115v, 60Hz |
|
|
What is the primary source of power for most weapons? |
400Hz, 440v, 3 phase power |
|
|
Where do newer ships get there supply of 400Hz power from? |
60/400Hz static converters |
|
|
How do we T/S a missing power input? |
Work backward, load to the source |
|
|
How are many suspected equipment casualties corrected? |
Restoring a power input or signal reference that was not discovered right away |
|
|
What is the link between the ships source of electrical power and the ships electrical loads? |
Power distribution system |
|
|
What does the AC power distribution system consist of? |
Power plant, switch boards and equiptment |
|
|
What interconnects the ships service generations and distribution switchboards? |
Bus ties |
|
|
Which feeder provides power supply when normal and alternate feeder power is lost? |
Emergency feeder |
|
|
What can be used to help determine which source of power is being used? |
CSOSS power distribution status board |
|
|
Why is emergency power distribution vital to the survival of a ship? |
Provides continuous power when a ship has lost its primary source of power |
|
|
How many zones may an emergency switchboard provide power to? |
More than one zone |
|
|
When will an emergency generator start automatically? |
When the appropriate auto mode switch on the switchboard is set to ON and loss of normal power is detected |
|
|
Who is responsible for the operation of the ships service generators, the emergency generators, and the distribution switchboards? |
Ships engineers |
|
|
What provides the means for making temporary connections to vital circuits and equiptment? |
Casualty power system |
|
|
What is the difference between connecting the portable cable with bulkhead terminals and riser terminals while keeping watertight integrity? |
Bulkhead terminal (side to side) riser (up and down) |
|
|
Who are the only personnel allowed to actually connect the portable cables? |
Qualified électriciens mates |
|
|
Where are power panels and bus transfer units that feed any equipment on the ship usually located? |
Close to that specific equiptment |
|
|
What types of lads are MBTs used for? |
Loads that require large starting currents |
|
|
What type of loads are ABTs used for? |
Loads that must be re-energized as son as possible |
|
|
What equipment is capable of monitoring and controlling an associated generator? |
power distribution switch boards |
|
|
What is listed on cabinet information plates |
Name of space, apparatus, or circuits served, service, and basic location #, supply feeder # |
