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.
|