• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

Card Range To Study

through

image

Play button

image

Play button

image

Progress

1/131

Click to flip

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;

131 Cards in this Set

  • Front
  • Back
Hull generated interference has become a major problem aboard ship because of:
-the increase in number and power of transmitters
-the increase in sensitivity and number of receivers.
-the requirement for increased use of the spectrum
-the same, or in some cases, less mounting space for antennas.
If a corroded joint or oxidized fastening is in the path of current flow, this happens:
rectification occurs
Name 5 major causes of corrosion.
-Galvanic
-Fatigue
-Crevice
-Stess
-Welding
What is the inherent danger of fatigue corrosion?
The breakdown of a protective film on the metals caused by bending or vibration.
Stress corrosion occurs when:
internally or externally stressed metals are exposed to a corrosive environment.
Stress corrosion is one of the most important and common types, but it is virtually impossible to predict because:
the same conditions that caused cracking in one metal will not influence another in the same general category.
The output of a nonlinear heterodyning stage consists of:
-Original two frequencies.
-The sums of the two original frequencies.
-The difference of the two original frequencies.
-All of their harmonics.
Typical hull-generated interference sources are:
-Loose metallic items in topside areas.
-Corroded stanchions and metalic lifelines.
-Rusty anchor chains and metalic cables.
-Rusty chains for accomidation ladders.
-Metallic safety nets, chains and cables.
-Loose and rusty mast items.
The level of hull generated interference signals is determined by:
-Output level of the transmitters.
- Efficiency of the nonlinear element as a rectifier - that is, the degree of nonlinearity.
- Coupling the amount od shielding between the transmitter and the nonlinear elelment.
-The physical size, configuration and orientation of the metallic objects comprising the junction.
-Physical properties, the gain of the transmit antennas.
Arcing may result when a radar rotary joint is:
- Dirty
- Worn
- Misaligned
Arcing will not occur in a rotary joint due to:
- Wetness
All cables are grouped into these 3 categories:
- Active
- Passive
- Susceptible
What is the minimum seperation requirement between 2 active cables?
18"
What is the minimum seperation requirement between active and passive cables?
18"
What is the minimum seperation requirement between passive and susceptible cables?
2"
What is the minimum seperation requirement between 2 passive cales?
None.
Who initiates requests for CGPMS revisions using FBRs?
Senior technician
Who is responsible for maintaining CGPMS Work Schedule Books (WSB)s?
EMO
The CGPMS Master Index contains the following information:
- All available CGPMS procedures.
- Navy Maintenance Index of Procedures (MIP) for Navy equipment used by the Coast Guard.
What is the function of a Maintenance Procedure Card (MPC)?
Step-by-step maintenance actions to be performed on an electronic equipment or system.
What is the function of the Index of Maintenance Procedures (IMP)?
An index of all applicable MPC for a given piece of equipment or system.
Units shall be responsible for tracking, updating, and maintaining planned maintenance in:
ALMIS
What is the process for inclusion into NPMS?
A letter or OPNAV 4900 C/K should be sent Commanding Officer, NAVSEA, Code 914.
When may a unit develop and use a Locally Planned Maintenance System (LPMS)?
Whenever the CGPMS or Navy PMS are not available for equipment or system they support.
What form is used for LPMS documentation?
Equipment History Forms, CG-5454.
What publication is referenced for safety/tagout logs?
Equipment Tag Out Procedures, COMDTINST 9077.1 (series).
Who is responsible for ensuring that checks and audits of all tag-outs are performed once every two weeks?
Department head.
For how long are completed inactive tag-out record sheets retained?
6 months.
When does tag numbering start for an Equipment Tag Out log?
Oct. 1st.
What is the first step to acquire a CMPlus account?
Contact OSC at 304.264.2500 and request to be added to the CMPlus user database.
What information is required when contacting OSC to be added to the CMPlus database?
Unit OPFAC.
Who is responsible for assigning you a CMPlus username and password?
CMPLus administrator at your unit.
The CMPLlus database is managed by?
OSC
DoD owned and managed items are identified by what cognizant symbol?
"7"
What are the 2 types of DLR items?
- Dod owned and managed.
-CG owned and managed.
Coast Guard users shall use this to requisition DLR items:
Military Requisitioning and Issue Procedures (MILSTRIP) Advice Code "5_" series.
What 4 codes are required when processing DLR transactions in the Federal Supply System?
- Repairability Code
- Cognizant Codes
- Activity Codes
-MILSMaterial Control Codes
Priority 13 DLR items will be shipped by:
Certified mail.
In regards to DLR items, ELC will send a unit a message on the _ day stating that item is overdue and due back in _ days to avoid billing.
45th day and 30th day.
In regards to DLR items,units are billed by ELC at the _ day and notification shall be sent to units via message.
75th day.
Communication transmitters can produce this from:

- Overdriven amplifiers
- Frequency multiplier stages
- Sideband splatter caused by overmodulation, excessive modulator bandwidths, or modulator nonlinearity.
- Modulator noise,
- Transmitter intermodulation and cross modulation caused by interaction between two or more transmitters.
Spurious Emissions.
Radar transmitters can produce spurious emissions from:
Arcing in PA stage, waveguide rotary joint, or antenna.
Natural interference has a:
steady hiss type static observed at high frequencies.
The transfer of undesired energy through conducors between a source of interference and a susceptible device is called:
Conducted EMI.
Factors affecting EMI are:
- Type of circuit.
- Frequencies involved.
- Power level.
-Amount of capacitive and inductive coupling between parts of the circuit.
What 3 factors determine the strength of a radiated EMi signal?
- Amount of current flow in the conductor from which the field radiates.
- Efficiency of the conductor as an antenna.
-Frequency of the waveform causing the field.
The following are categorized as?
- Broadband emissions caused by arcing.
- Harmonic radiation.
- Outputs caused by parasitic oscillations.
- Transmitter noise.
- Cross modulation and intermodulation.
Spurious Emissions.
This is present to some degree in the output of all transmitters because of nonlineraity of the power output stage.
Harmonic radiation.
This occurs when a circuit is self excited and goes into oscillation at a frequency other than the desired one.
Parasitic oscillations.
This may occur in the output stage of a transmitter when improper neutalization follows tube replacement in that stage.
Parasitic oscillations.
This is generated in the various RF stages, together with noise from the audio system and power supply.
Transmitter noise.
This occurs when some sidebands (not the center frequency or carrier of an undesired signal) are within the receiver bandpass.
Adjacent Channel Interference.
This occurs between communication systems that have been assigned neighboring channels.
Adjacent Channel Interference.
This occurs when a strong unwanted signal penetrates the input filter circuits and encounters a nonlinear element such as the mixer of an overloaded RF amplifier stage:
Non-linear intrusion.
Interference between radars usually appears as a series of moving dots on the dispaly. These are called?
Running rabbits.
These are combinations of circuit components designed to pass currents at certain frequencies or to attenuate currents at other frquencies.
Filters.
Any change that affects operation characteristics is called:
A change to function.
Any change that affects an interface with another component is called:
A change to fit.
Any change that affects the weight, balance, or movement of interia of a component is called:
A change to form.
This Field Change furnishes a field change part kit (which is assigned a Activity Control number, and includes documentation, parts and special tools) required to complete a change.

This type of field change requires the installing unit to:
- complete alterations to equipment
- add corresponding changes to the technical documentation.
Type 1 Field Change.
This type of Field Change furnishes documentation only.

This type of field change requires the installing unit to:
- procure (and provide funds for) required parts or special tools.
- complete alterations to equipment
- add corresponding changes to the technical documentation.umentation only.
Type 2 Field Change.
This type of Field Change furnishes documentation and some of the parts or special tools needed in a field change parts kit.

This type of field change requires the installing unit to:
- procure (and provide funds for) required parts or special tools.
- complete alterations to equipment
- add corresponding changes to the technical documentation.umentation only.
Type 3 Field Change.
This type of Field Change implements changes to technical documentation only. It requires no alterations to the equipment.
Type 4 Field Change.
This section of a SOVT provides procedures to ensure that the installation has been accomplished in accordance with approved installation plans and specifications. Cold Check tests shall verify:
- Cabinet power and ground connections.
- Equipment power and ground connections.
- Signal cable connections.
Section 3 - Cold Checks
What does SOVT stand for?
System
Operation and
Verification
Test
This SOVT section provides key identification data about the document.
Cover Sheet
DC resistance across bonding and grounding junctions shall not exceed:
0.1 ohms for electrical safety.
RF impedance across bonding and grounding junctions shall not exceed:
25 ohms at 30 Mhz.
MIL-STD-1880-124B recommends that these be installed on 120-volt single phase, 15- and 20- ampere receptacles of C-E facilities.
GFCIs (Ground Fault Circuit Interrupters)
Roof and down conductors must be a seperate _ AWG cable.
0000 AWG.
Where a metal mast is used it should be connected to ground plates using a size _ AWG cable.
0000 AWG.
Non-metalic masts and topmasts must have a lightning ground conductor usinge a size _ AWG cable.
0000 AWG.
All metal obects within _ ft of the lightening down conductor must be bonded or grounded to the facility ground.
6 ft or 1.8 meters
Which of the following systems does NOT use a signal reference grounding system:
A. HF
B. VHF
C. LF
D. Hybrid
B. VHF
Which of the following materials should NOT be used when grounded an electrode:
A. Zinc
B. Copper
C. Aluminum
D. Copper-clad Steel
A. Zinc
A night with a full moon and a clear sky is considered:
Low Level Light (LLL)
A moonless night with a partially overcast sky is considered:
Extremely Low Light Level
Light level <.0003 is considered:
Extremely Low Light Level
Light level <.95
Low Level Light (LLL)
Flight Deck Video System (FDVS) cameras are sealed and pressurized to:
5PSI of dry nitrogen.
What versions of FDVS do WHEC 378' use?
- V1
- V2
- V3
What versions of FDVS do WMEC 270' use?
- V2
- V4
What versions of FDVS do WMEC 210' use?
- V3
- V5
Auditing spare parts and modules in the inventory informs the supervisor and Supply officer which items are:
overstocked, understocked, or need to be ordered.
What is the standard acceptable accuracy for an spot inventory check?
90 %
Authorized Perioicity Code A means?
-Annual.
-Scheduled once a year.
Authorized Perioicity Code S means?
- Semi Annual.
- twice a year.
- every other quarter.
Authorized Perioicity Code Q means?
- Quarterly.
- Once each quarter.
- 2 to months apart.
Authorized Perioicity Code M means?
- Monthly.
- Once each month.
- 3 to 6 weeks apart.
Authorized Perioicity Code W means?
- Weekly.
- Once each week.
Authorized Perioicity Code D means?
- Daily.
Authorized Perioicity Code xM means?
x = amount of additional seperation.
example:
4M = every four months.
Authorized Perioicity Code xW means?
x = amount of additional speration.
example:
2W = every second week.
Authorized Perioicity Code xD means?
x = amount of additional seperation.
example:
3D = every third day
Non-Calendar Periodocity code R means?
-Situational Requirement
- As required
Non-Calendar Periodocity code U means?
- Unscheduled
- As a a result of a casualty this maintenance was performed.
Inactive Equipment Maintenance (IEM) code LU means?
- Layup Maintainence
- Performed before going into a yard period were the equipment is unused and uncovered.
Performed before going into a yard period were the equipment is unused and uncovered.
- Layup Maintainence
- Inactive Equipment Maintenance (IEM) code LU
Inactive Equipment Maintenance (IEM) code PM means?
- Preventive maintenance
- Performed while equipment is in layup to ensure coverage.
Inactive Equipment Maintenance (IEM) code SU means?
- Start up
- Performed on equipment to remove it from layup status.
Inactive Equipment Maintenance (IEM) code OT means?
- Operational test
- Performed to check normal operation after layup.
Does the term or documentation "Maintenance Index Page" (MIP) pertain to CGPMS or Navy PMS?
Navy PMS
Does the term or documentation "Index of Maintenance Procedures" (IMP) pertain to CGPMS or Navy PMS?
CGPMS
Does the term or documentation "Maintenance Requirement Card" (MRC) pertain to CGPMS or Navy PMS?
Navy PMS
Does the term or documentation "Maintenance Procedure Card"" (MPC) pertain to CGPMS or Navy PMS?
CGPMS
Does the term or documentation "4790/7B Feedback Report" pertain to CGPMS or Navy PMS?
Navy PMS
Does the term or documentation "Form 5451 Feedback Report" pertain to CGPMS or Navy PMS?
CGPMS
Name the three types of FRB:
- Non-technical (Cat A)
- Technical (Cat B)
- Urgent FBR (Cat B)
This type of interference consists of impulses of high intensity, occuring intermittently, caused by local thunderstorms.
Natural Interference.
This type of interference consists of a steady rattling or crackling procuded by distant thunderstorms.
Natural Interference.
This type of interference consists of a steady hiss type of static observed at higher frequencies.
Natural Interference.
This type of interference in receiving equipment and is caused by thermal agitation of electroncs in the circuit resistance.
Inherent Interference.
This type of interference is caused by the random motion of free electrons developing voltages in the conductors and components.
Inherent Interference.
The following actions aid in containing what?

-Filtering to shunt the interference to ground.
- Shielding to confine interfering signals.
- Properly grounding circuits, shields, and interconnecting cabling.
- Using isolation transformers for circuit (and ground) isolation.
- Seperating low-level signal cables from other cables.
Conducted EMI
What type of bond is formed when two metalic surfaces are joined by a weld?
Direct
The MOST common sources of EMI are?
Motors and generators.
Broadband interference is usually caused by?
Arcing or corona.
The BEST place to eliminate or surpress EMI is at the?
Source.
Any emission from the generation source other than the one meant to transmit intelligance is called this:
Spurious Emissions.
This is the transfer of modualtion from one carrier to the other.
Cross Modulation.
This is the generation of numerous new frequencies from two or more original signals.
Intermodulation.
Improper neutralization and/or improper lead dressing are the usual causes of:
Parasitic Oscillations.
Which circuit in a receiver radiates interference?
Local oscillator.
Control cables fall into this general category.
Passive (medium level) cables.
What are the two general techniques for bonding?
Direct and Indirect.
Interference from arcing is sometimes misinterpreted as:
High level ambient noise.
What governs lock-out procedures at shore units?
OSHA.
When should abbreviated tag-out audits be conducted?
As part of a routine watch relief.
On a flat roof where should lightning protection air terminals be placed?
On the corners or edges.
Who may initiate the TCTO process?
Anyone.
Who is notified when a Field Change has been completed?
ELC.