Installation Standards (NIMB)

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  1. Before doing installations or alterations to equipment we must have the proper authorization. Typically, we get authorization from what?
    · Ship Alteration (ShipAlt),· Boat Alteration (BoatAlt),· Electronics Alteration (ElectronicAlt), or· Field Change
  2. A cable is a transmission line used to do what?
    transfer energy from one point to another
  3. cables can be grouped into what 4 types?
    · Coaxial,· Fiber Optic,· Multi-Conductor, and· Power.
  4. What is the most widely used type of RF transmission line.
    Coaxial cables
  5. What is The major advantage of the coaxial cable
    its ability to reduce radiation loss
  6. Coaxial cables are classified as
    flexible or semi-rigid
  7. Multi-conductor cables are used to do what?
    send operating signals back and forth between pieces of electronic equipment
  8. Multi-conductor cables are often referred to as?
    Control Cables
  9. To get the maximum transfer of energy, the impedance of coaxial cable should match what?
    The impedance of the system to which it is connected
  10. The most common cable impedances are?
    50 ohm and 75 ohm
  11. What is not a concern for multi-conductor and power cables?
  12. The cable rating you select should be ______ than the maximum rating required for the system.
  13. When working with coaxial cable the rule of thumb is that As frequency increases so does _____.
  14. What is not a concern for power or multi conductor cables?
  15. In cables, the loss is called what?
  16. Attenuation is measured in what?
    db per foot
  17. Active cables include what types?
    Radar Modular pulse, MF and HF Transmitter cables
  18. Susceptible cables include what types?
    Radio Receiving Antenna, and Transceiver cables
  19. Flexible coaxial cable has a minimum bend radious of?
    10 times the cable diameter
  20. "Repeated" flexibile coaxial cable as a minimum bend radious of?
    20 times the cable diameter
  21. Semi-rigid Cable with an Outside Diameter of (0.500") has a minimum bend radious of?
    5 inches
  22. Semi-rigid Cable with an Outside Diameter of (1.625") has a minimum bend radious of?
    25 inches
  23. Semi-rigid Cable with an Outside Diameter of (0.875") has a minimum bend radious of?
    10 inches
  24. Semi-rigid Cable with an Outside Diameter of (3.125") has a minimum bend radious of?
    50 inches
  25. Always remember when routing a cable through a cable conduit or raceway to attach what for the next technician.
    a pull cord
  26. Cable tags shall be installed when?
    · On all permanently installed cables,· As close as possible to each end of the cable,· On both sides of bulkheads and decks, and· Not more than 50 ' apart.
  27. When routing cables what will definitely cause problems in the future?
    Poor Workmanship
  28. To lessen the effects of continuous flexing cables should be routed ______ across hinges.
  29. All spare conductors of a cable shall be cut so that they can what?
    Reach the furthermost terminal board serviced by that cable.
  30. What two test should be performed before and after installation of a cable?
    · Continuity test, and· Insulation resistance test.
  31. Insulation resistance tests are categorized in what two categories?
    · Multi-Conductor Testing· Coaxial Testing
  32. When performing insulation resistance tests on multi-conductors the resistance reading from one conductor to the next should be what?
    greater than 50,000 ohms
  33. A coaxial test requires the use of what type of equipment to test coaxial cables?
    500-volt megohmeter
  34. When testing a coaxial cable with a megohmeter a reading of what indicates that no action is required (good cable).
  35. When testing a coaxial cable with a megohmeter a reading of what indicates that there is need for maintenance. Check and clean insulators and connectors?
    Between 5M and 200M-ohms
  36. When testing a coaxial cable with a megohmeter a reading of what indicates that there is an immediate and urgent need to find and correct the cause of the low reading?
    5M-ohms or less
  37. Unused cables should be stored on what and where?
    On reels and in an area where the temperature is stable.
  38. Cables should not be stored in areas where what three conditions exist?
    · Flooding may occur,· The temperature exceeds 66°C (151°F), or· Chemicals and flammable material are stored.
  39. When removing moisture from a cable and it is determined that the moisture penetration is confined to the cable ends, a length not greater than ____ may be cut from each end and a new measurement of insulation resistance shall be made.
    four feet
  40. When dealing with damaged cables you should avoid ____ whenever possible
  41. The Coast Guard basically uses two types of connectors. They are?
    · Multi-Pin connectors, and· RF connectors.
  42. What are the 4 most commonly used types of RF connectors used in the CG?
    UHF, N, C, BNC
  43. Three types of multi-pin connectors used in the CG are?
    Amphenol, Bendix, Cannon
  44. All connectors that are not indoors must be weatherproofed. Electrical connectors shall be weatherproofed within ___ hours of assembly.
  45. Weatherproofed multi-pin connectors should be visually inspected how often for signs of deterioration.
  46. Waveguides are used to transmit frequencies in the ____ range.
    microwave range (.9 GHz- 100 GHz).
  47. Waveguides are basically hollow pipes that guide electromagnetic waves. They are made of conductive material. What are the three types of material?
    brass, copper, or aluminum
  48. Waveguides are found in what three shapes?
    · Rectangular,· Circular, and· Elliptical.
  49. What is the most common type of waveguide found?
  50. When coaxial cable is used as a microwave transmission line it has what kind of loss?
    High Loss
  51. Waveguide systems are pressurized to help prevent what?
    · Foreign material from entering the waveguide, and· Moisture from accumulating in the waveguide due to temperature changes.
  52. If desiccant is used to control moisture a blue color indicates what?
    Dry condition, no action required
  53. If desiccant is used to control moisture a pink color indicates what?
    It has absorbed too much moisture and replace the dehydrator plug.
  54. Pressure windows are also called what?
    waveguide moisture barriers
  55. A waveguide pressure system should not drop any more than ___ of the required pressure within a ____ hour period?
    5%, 6 hours
  56. Where should a purge valve be installed on a waveguide pressure system?
    the lowest point in the system
  57. A purge valve is used to do what in a waveguide pressure system?
    · To remove excess moisture that the desiccant is unable to remove, and· When purging the system after the waveguide has been opened for repairs.
  58. The most common trouble encountered with waveguides is?
    The presence of dirt, moisture, and other foreign material.
  59. Waveguides are required to have the warning label which says what, and painted every____?
    "Do Not Strike", every three feet
  60. When inspecting waveguides check for what conditions?
    · Dents,· Bends,· Damaged supports, and· Discoloration (Hot spots).
  61. The efficiency of a waveguide is measured by what two tests?
    · Voltage Standing Wave Ratio (VSWR), and· Minimum Discernible Signal (MDS)
  62. Transit devices are used to do what?
    route cables through bulkheads, decks, or enclosures
  63. What are the four types of transient devices?
    · Box Connectors,· Metal Stuffing Tubes,· Nylon Stuffing Tubes, and· Multi-Cable Transit Frames.
  64. A box connector is used for what?
    lighting fixtures, fittings, and enclosures not classified as watertight.
  65. A metal stuffing tube must be used in cable installations requiring what two things?
    · Airtight, or· Watertight integrity.
  66. An enclosure, deck or bulkhead made of steel can only be used with a metal stuffing tube made of what?
    Steel and Brass
  67. An enclosure, deck or bulkhead made of zinc can only be used with a metal stuffing tube made of what?
  68. An enclosure, deck or bulkhead made of aluminum can only be used with a metal stuffing tube made of what?
    Steel and Aluminum
  69. Nylon stuffing tubes are also used where watertight and airtight integrity is needed, but they are also used when a bulkheads thickness is _____ making it difficult to weld too.
    3/16" or less
  70. Bonding includes those techniques and procedures necessary to achieve what?
    A strong, low impedance connection between metal objects
  71. What is the most common form of indirect bonding?
    A bond strap
  72. When a bond strap is installed what two types are used for the different environments (outside, inside)?
    -Corrosive Resistance Steel (CRES) 316 for outside environments-Copper for inside environments
  73. Bonding jumpers are made out of what two types of material for the different environments (Outside, inside)?
    Copper Braid - InsideTRXF-84 Cable (welding Cable) - Outside
  74. What are the two classifiactaions of bonds? (not types)
    Permanent, Semi-Permanent
  75. What is the preferred method of bonding?
  76. What is the most common way of achieving a mechanical bond?
  77. What is The preferred method of welding that qualified ET’s perform?
  78. The resistance between two metal surfaces that are bonded should be what?
    Less than 0.001 ohms
  79. You can find information concerning electronic equipment alterations in CG manual _____ chapter _____.
    Electronics Manual M10550.25 ch. 1
  80. List four types of transmission cables.
    Coaxial, Fiber Optic, Multi-Conductor, Power
  81. What is the minimum separation required between an Active cable and a Passive cable?
    18 inches
  82. Given the following information, determine the power loss (in watts) of the cable.Power into cable: 50 wattsVoltage into cable: 100 voltsCable length: 352 ft.Cable loss: 2.3 db per 100 ft.
    • 42.25 watts…
    • Total loss in db is .023 db per ft. X 352 ft.¬†= -8.096 loss.
    • Applying the Power out formula 10 (db/ 10) x Pin = Pout gives a Pout of 7.751 watts. This results in a total loss of 42.25 watts(50 watts¬†- 7.751 watts)
  83. The minimum bend radius of a Semi-rigid cable with an outside diameter of .875” is ______.
    10 inches
  84. Cable tags shall be installed on one side/either side/both sides of bulkheads and decks.
    both sides
  85. What can be done to protect cables from sharp edges?
    Install support clamps, synthetic tubing, or wrap cable with several layers of electrical tape.
  86. When testing multi-conductor cables, the minimum resistance between individual conductors should be ____ohms.
    Greater than 50 k ohms.
  87. When routing a cable to a terminal board, how long should you leave spare conductors?
    Long enough to reach the farthest terminal.
  88. What is the maximum temperature that stored cables should be exposed to?
    151 degrees Fahrenheit.
  89. What must be done to a cable that has been exposed to moisture before you use it? (explain procedure)
    Cut back the end of the cable that was exposed no more than four feet to determine if the insulation resistance increases. If it doesn’t increase, discard cable. If it does, run a current through the cable for a few hours to improve its resistance. Continue this process until cable meets the required resistance value.
  90. The two basic types of connectors used by the Coast Guard are _____ and _____.
    Multi-pin and RF connectors
  91. In general, a connector can be left without weatherproofing for up to ____ hours.
  92. List 4 types of RF connectors used in the Coast Guard.
    UHF, N, C, BNC
  93. The range of the Microwave frequency band is ______.
    900 Mhz to 100 Ghz.
  94. What key factor determines the size of a waveguide?
  95. How much pressure (psi) are waveguide systems designed to hold?
    3 to 5 psi
  96. A localized area of discoloration in a waveguide indicates _______
    The presence of a foreign object inside the waveguide. A.K.A. hot spot.
  97. What are pressure windows?
    A moisture barrier that allows a waveguide to be pressurized.
  98. Box connectors are/are not classified as watertight.
  99. What should you do if you tighten down the gland nut in a metal stuffing tube and the cable is still loose?
    Add additional sealing packs around the cable.
  100. State the procedure for replacing a rubber bushing on an existing nylon stuffing tube with a cable run.
    Cut a 30 degree slit on the new rubber bushing and wrap around cable.
  101. State the 2 types of bonding.
    direct, indirect
  102. What is bonding?
    The process of joining metal objects together and producing a low impedance connection between them
  103. The maximum resistance between two bonded metals should be ___________ .
    Less than .001 ohm
  104. After completing an installation, what other steps should be taken to insure your customer(s) are totally satisfied?
    • a. Clean up your mess
    • b. Document any work alterations and notify the issuing authority
    • c. Perform a complete functional check to ensure system works properly
    • d. Update unit drawings
    • e. Walk customer thoughf. Train personnel on new system/installation
Card Set:
Installation Standards (NIMB)
2014-04-11 17:56:21
Navy Installation maintenance book

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