IC Volume 1 Flashcards
What is the purpose of tags?
To prevent the improper operation of a component, piece of equipment, system, or portion of system when isolated or in an abnormal condition.
Danger- shock hazard signs are used when?
Voltages are between 30 and 500 volts
Caution tag
A yellow tag used as a precautionary measure to provide temporary special instructions or to indicate that unusual caution must be exercised to operate equipment.
Danger tag
Commonly called the red tag, is used to prevent the operation of equipment that could jeopardize the safety of personnel or endanger the equipment.
Out-of-calibration
Orange labels used to identify instruments that are out of calibration and will not give accurate measurements.
Out-of-commission
A red label used to identify instruments that will not indicate correct measurements because they are defective or isolated from the system.
What is the circuit designation of salinity cells?
SB
What is the circuit designation of anemometers?
HD/HE
What kind of electrical distribution systems found on navy ships?
Ungrounded
What is a reason for an ungrounded system?
An ungrounded system is to achieve max system reliability and continuity of electrical power under combat conditions.
What is the perfect ungrounded system?
It is when the insulation is perfect on all cables, switchboards, circuit breakers, generators, and load equipment; no filter capacitors are connected between ground and conductors.
The more resistance the…
Better the system is insulated; therefore, less current will flow between the conductor and the ground.
What are interlock switches?
Used to prevent technical and maintenance personnel from coming into contact with electrical potentials in excess of 30V
Isolated receptacle circuits are used to?
Help reduce the inherent hazard of leakage currents where portable tools and appliances are plugged in and out.
Safety gloves with label color red
Class 0
1,000V
Safety gloves color label white
Class 1
7,500V
Safety gloves color label yellow
Class 2
17,000V
Safety gloves color label green
Class 3
26,500V
CO2 gas extinguisher
Effective on any type of fire, particularly electrical fires
PKP
(Potassium bicarbonate) very effective on class Bravo fires. Not recommended for electrical fires because it causes corrosion of electrical components.
Soda-acid
Effective only on class A fires. Not recommended for electrical fires- acts as a conductor, not effective on burning compounds.
Foam
Very effective on burning compounds such as oil and similar minerals. Not satisfactory for electrical fire; good conductor or electricity.
Halon 1301
Effective on all classes of fire except class D. It is colorless, odorless gas the does not conduct electricity or leave residue.
1 milliamperes (0.001 amp)
Shock is possible
10 milliamperes (0.01 amp)
Lose voluntary control of muscles
100 milliamperes (0.1 amps)
Shock usually fatal if it is sustained for 1 second or more
Abrasions
Skin is rubbed or scrapped off
Incisions
Wounds made with a sharp instrument such as knives or razors.
Lacerations
Wounds are torn rather than cut
Punctures
Objects that penetrate into the tissue leaving an opening
Never place a meter near?
A strong magnetic field
What are lead-acid batteries used for?
Emergency power source power source for IC systems
What equipment are lead-acid batteries commonly used in?
Gyrocompasses and automatic telephone exchanges
What are Alkaline storage batteries used for?
Bus failure alarms
Types of batteries
Lead-acid
Alkaline
Dry-cell batteries
Cable marking meaning for C-
Interior communications
Cable marking meaning for D-
Degaussing
Cable marking meaning for G-
Fire control
Cable marking meaning for L-
Ships service lighting
Cable marking meaning for N-
Navigational lighting
Cable marking meaning for P-
Ships service power
Cable marking meaning for R-
Electronics
Cable marking meaning for CP-
Casualty Power
Cable marking meaning for EL-
Emergency Lighting
Cable marking meaning for EP
Emergency Power
Cable marking meaning for FL-
Night Flight
Cable marking meaning for MC-
Coolant pump power
Cable marking meaning for MS-
Minesweeping
Cable marking meaning for PP-
Propulsion Power
Cable marking meaning for SF-
Special Frequency Power
What temp can you operate lead-acid battery?
Operate lower than 125
Store below 96
Continuity on a multimeter
If continuity exist the meter beeps twice if it is in touch hold mode
Fuses
A protective device used to open an electric circuit when current flow exceeds a safe value.
Cartridge fuse
Consists of a zinc-alloy link enclosed in a fiber, plastic, ceramic, or glass cylinder
Solenoids
Used for electrically operating hydraulic valve actuator, carbon pile voltage regulators, power relays, and mechanical clutches.
Advantage of using solenoids?
It’s mechanical movement can be accomplished at a considerable distance from the control.
What are power relays?
Also known as contractors, use relatively small amount of electrical power to control the switching of a large amount of power.
Series type relays
Operated by circuit current flowing through the coil or coils
What is a control relay?
Usually known as a simple relay. Frequently used in the control of low-power circuits or other relays.
What is a clapper relay?
Has multiple sets of contacts. As the circuit is energized, the clapper is pulled to a magnetic coil.
Thermal time delay relay
Constructed to produce a delay action when energized.
Latch-in relay
Designed to lock the contacts in the de-energized position until the relay is either manually or electrical reset.
AC shunt relay
The basic function of the relay is to make or break an electrical control circuit when the coil is energized.
Primary factors in causing heat stress conditions
Excessive steam and water leaks
Boiler air casing leaks
Missing or deteriorated lagging on steam piping, valves, and machinery
Double hearing protection should be worn when
Noise levels are greater than 104db
hearing protection should be worn when
Noise levels are greater than 84db
Circuit breaker purposes
- to provide circuit protection
- to preform normal switching operations
- to isolate a defective circuit while repairs are being made
Overload relays
Provided in motor controllers to protect the motor from excessive currents
Types of thermal overload relays
- bimetal type
- single metal type
- induction type
Types of cables
- watertight cables
- armored cables
- non- flexing service
Watertight cables
Standard cable in which all spaces under the impervious sheath are filled with material. Prevents the flow of water through the cable if one end of the cable is exposed to water under pressure.
Armored cable
Cable that has an outer shield of braided aluminum or steel.
Types of general use cables
- LSDSGA 3
- LSDCOP 2
- LSMSCA 30
LSDSGA 3
Low smoke, double conductor, shipboard, general use, armored, conductor size approximately 3000 circular coils.
LSDCOP 2
Low smoke, double conductor, oil resistant, portable, conductor size approximately 2000 circular mils
LSMSCA 30
Low smoke, multiple conductor, shipboard, control armored, 30 conductors
Watertight with circuit integrity non- flexing service is used for?
- power and lighting
- control
- electronic, communication, and instrumentation
Watertight, non- flexing service is used for?
- power and lighting
- electronic, communication, and instrumentation
Non-watertight with circuit integrity, non- flexing service is used for?
-electronic, communication, and instrumentation
Non-watertight, non- flexing service
- power and lighting
- control
- electronic, communication, and instrumentation
Non-watertight, flexing service
- power and lighting
- control
- electronic, communication, and instrumentation
When you are working on energized equipment, what safety procedures should you follow?
Make sure to have a CPR qualified person there
Fiber optics is what?
The study of light, its composition, how it travels, it’s effect on objects, and how it enables us to see
What are the three parts of fiber optics?
Core
Cladding
Buffer
How many microns does the buffer have?
900
How many microns does the acrylate coating have?
250
How many microns does the cladding (glass) have?
125
How many microns does the core (glass) have?
8-10 (sm)
50 (mm)
62.5 (mm)
Fiber core
Optical Transmision path, will be denser than the cladding in order to minimize the loss of light.
Fiber cladding
Surrounds the core and provides the reflective surface that allows light to propagate along the core to the distance end.
Fiber coating
Usually one or more layers of polymer or acrylate material
IC systems that are essential to the safety of the ship and ship personnel are assigned what readiness classification?
Class 1
What are the three permanently installed power distribution systems aboard ship?
Emergency
Casualty
Ships service
Most AC power distribution systems are rated at?
450 volts
3- phase
60 hz
3- wire ungrounded system
