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;
71 Cards in this Set
- Front
- Back
problems that the use of pressurized dry air decreases
|
corrosion, contamination, and moisture collection |
|
Type one dry air system |
refridgerant |
|
type two dry air system |
desiccant |
|
type three dry air system |
combination of one and two |
|
piece of equipment is used with the dehydrators in dry air systems |
low pressure air compressors
|
|
what happens to relative humidity as air is compressed
|
increases |
|
purpose of two dehydrators on a ship |
one is to be regularly used the other is for emergencies |
|
large ships have how many dehydrators |
four |
|
controls and regulates pressure to the electronic user equipment |
air control panels |
|
local dehydrators are used |
only in battle |
|
pressurized dry air has what influence on dielectric strength |
increases strength
|
|
delivers very clean dry air for pressurization of equipment waveguides
|
desiccant air dryer |
|
psi ratings for HP air |
20-35 psi |
|
dew point ratings for HP air |
|
|
HP air is likely to reduce |
likelihood of arcing |
|
psi for LP air |
1-8 psi |
|
LP air is used to prevent
|
corrosion and contamination inside the waveguide |
|
moisture probes are used for |
Monitor the dew point of the dry air |
|
moisture removal method freezes the air |
refrigerant |
|
desiccant method causes the air to become |
electronic dry |
|
fluid separators do what
|
extracts most of the free liquids from the air stream
|
|
removes oil from the air during the absorption cleaning process
|
oil filter
|
|
most important unit of the system
|
purifier dehydrator |
|
what is used iinstead of chemicals during eh nonchemical membrane method process |
osmosis |
|
can cause a change in the operating parameters and failure of electronic parts |
heat generated from electronic equipment |
|
convection relies on what for cooling |
natural airflow |
|
added to heat producing parts to increase heat dissipation |
finned heat sinks |
|
what is used to draw cool air in during the forced air method |
a blower |
|
method that is used to cool electronic equipment that has airtight sealed components |
air to air
|
|
what do air liquid cooling systems use to shut down equipment to prevent overheating |
built in safety devices |
|
in the liquid coolingsystem which loop provides the initial source of cooling water |
primary cooling systme |
|
type one temperature limit |
95 degrees F |
|
type two temperature limit |
90 degrees F |
|
cooling water used in primary loops |
seawater/chilled water |
|
cooling water used in secondary loops |
distilled water |
|
four components of a primary loop |
seawater strainers, flow regulators, chilled water temp valves, heat exchangers |
|
types of seawater strainers
|
simplex and duplex |
|
strainer that requires the water be turned off with the valve before doing maintenance |
seawater simplex strainer
|
|
type of valve is the CW temperature regulating valve
|
two way |
|
where is the hottest water found in the system
|
at the distilled water inlet |
|
point where the primary and the secondary systems come together |
heat exchanger |
|
keeps the heat exchanger fully submerged for greater efficiency and heat transfer |
constant flow regulator |
|
steel plate with a hope in it that controls the volume of water |
orifice plate |
|
CW temperature regulating valve regulates |
flow of chilled water through the heat exchanger to maintain the water temp in secondary system |
|
where is the heat that has been absorbed by distilled water flowing through the electronic components in the secondary system transferred to
|
primary cooling system |
|
why does a cooling system have 2 heat exchangers
|
one is active the other is standby for emergencies |
|
components of the secondary loop |
distilled water circulating pump, expansion tank, demineralizer, temp control valves |
|
components of the secondary loop
|
heat exchangers, monitored equip with associated alarms, electric equip being cooled
|
|
why are there 2 DW circulating pumps
|
one is in service the other is standby for emergencies |
|
what interconnects the ships service generators and distribution switchboards. |
bus ties |
|
what does the ac power distribution system consist of |
440V, 60 Hz, 3 phase, 3 wire, ungrounded systems |
|
link between the ships source of electrical power and the ships electrical loads |
power distribution system |
|
how are many suspected equipment casualties corrected |
restoring power, signal reference |
|
how to trouble shoot missing power input |
working backward from load to source |
|
where do newer ships get there supply of 400 hz of power from |
60/400 Hz static converters |
|
primary source of most weapon systems
|
400 Hz, 440V, 3Phase |
|
what is 440V, 60 Hz, 3 phase power converted to by transformers
|
115V, 60 Hz, 3 phase power |
|
where is 60 Hz power supplied from respectively |
service generators |
|
where is 400 Hz power supplied from respectively |
motor generator sets |
|
type of tank that uses pressurized air |
pressurized tank |
|
expansion tank that is located above the highest point in the distilled water system |
gravity tanks |
|
three types of flow regulators in the secondary loop |
equip flow, pressure regulator valve, constant flow
|
|
type of valve is the temperature regulating valve
|
three way valve |
|
main purpose is to maintain a desired temperature of distilled water for the electronic equipment |
temperature regulator valves |
|
which feeder provides power supply when normal and alternate feeder power is lost |
emergency feeder |
|
can be used to help determine which source of power is being used |
(csoss) combat systems operation sequence system
|
|
why is emergency power distribution vital to the survival of a ship
|
provides a continuous source of power when primary source is lost |
|
number of zones an emergency switchboard may provide for
|
more than one |
|
when will an emergency generator start automatically |
when auto is turned on, and normal loss is detected |
|
responsible for the operation of the ships service generators, emergency generators, and distributing switchboards |
(EN,MM,EM) |
|
provides the means for making temporary connections to vital circuits equiptment |
casualty power system |