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89 Cards in this Set
- Front
- Back
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True or False. Facility ground systems inspections and site surveys are conducted after major changes to the facility, structure or equipment are made.
1. True 2. False |
True
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Which of the following components does not make up part of the facility ground system?
1. Fault protection subsystem 2. Signal reference ground system 3. Workbench ground system 4. Earth electrode subsystem or shipboard ground plane |
Workbench ground system
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What is not a primary function of a facility ground system?
1. Personel safety 2. Equipment and facility protection 3. Electrical noise reduction 4. Visual media protection |
Visual media protection
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What is a Class C bond?
1. Welding of mettalic surfaces 2. Bridging using a mettalic (conductive) strap 3. Bolting or clampint of mettalic surfaces 4. Bridging two mettalic surfaces with solder |
Bridging using a mettalic (conductive) strap
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What is a Class A bond?
1. Joining two metallic surfaces by welding or brazing 2. A bond established by bolting or clamping two metallic surfaces together 3. A bond established by bridging two metallic surfaces with a metallic bond strap 4. A bond established by bridging two metallic surfaces with solder |
Joining two metallic surfaces by welding or brazing
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What is a Class B bond?
1. A bond established by bridging two metallic surfaces with a metallic bond strap 2. A bond established by bridging two metallic surfaces with solder 3. A bond established by joining two metallic surfaces by welding or brazing 4. A bond established by bolting or clamping two metallic surfaces together |
A bond established by bolting or clamping two metallic surfaces together
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What must the DC resistance be across the bond surface using a Class C bond? (Not using the bond strap as one of the surfaces)
1. less than 10 ohms 2. less than 5 ohms 3. less than 0.5 ohms 4. less than 0.1 ohms |
less than 0.1 ohms
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What class of bonding should be used for electrical or electronic systems requiring permanent bonds?
1. Class A 2. Class B 3. Class C 4. Class D |
Class A
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What is a type 1 Class C bond?
1. Flat copper braid with mounting holes in each end 2. Flat CRES 316 with mounting holes in each end 3. A corrosion-resistant copper/nickel alloy assembly 4. TRFX-84 cable with mounting lugs and hardware to suit individual install needs |
A corrosion-resistant copper/nickel alloy assembly
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What is a type 2 Class C bond?
1. A corrosion-resistant copper/nickel alloy assembly 2. Flat CRES 316 with mounting holes in each end 3. Flat copper braid with mounting holes in each end 4. TRFX cable with mouting lugs and hardware to suit individual install |
Flat CRES 316 with mounting holes in each end
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What is a type 3 Class C bond?
1. Flat copper braid with mouting holes in each end 2. Flat CRES 316 with mounting holes in each end 3. A corrosion-resistant copper/nickel alloy assembly 4. Flat copper with mouting holes in each end |
Flat copper with mouting holes in each end
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What is a type 4 Class C bond?
1. Flat copper braid with mounting holes in each end 2. Flat copper with mounting holes in each end 3. Flat CRES 316 with mounting holes in each end 4. A corrosion-resistant copper/nickel alloy assembly |
Flat copper braid with mounting holes in each end
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What is a type 4 Class C bond?
1. Flat copper braid with mounting holes in each end 2. Flat copper with mounting holes in each end 3. Flat CRES 316 with mounting holes in each end 4. A corrosion-resistant copper/nickel alloy assembly |
Flat copper braid with mounting holes in each end
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What is a type 4 Class C bond?
1. Flat copper braid with mounting holes in each end 2. Flat copper with mounting holes in each end 3. Flat CRES 316 with mounting holes in each end 4. A corrosion-resistant copper/nickel alloy assembly |
Flat copper braid with mounting holes in each end
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What is a type 5 Class C bond?
1. A corrosion-resistant copper/nickel alloy assembly 2. Flat CRES 316 with mounting holes in each end 3. TRFX-84 cable with mouting lugs and hardware to suit individual intall 4. Flat copper braid with mouting holes in each end |
TRFX-84 cable with mouting lugs and hardware to suit individual intall
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Which fault protection subsystem incorporates grounding conductors (green wires) that are built into the electrical system?
1. Signal Ground Reference 2. Fault Protection 3. Earth Electrode 4. Lightning Protection |
Fault Protection
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Which facility ground subsystem uses a network of interconnecting rods, wires, pipes, or other configurations of metals?
1. Lightning Protection 2. Signal Ground Reference 3. Fault Protection 4. Earth electrode |
Earth electrode
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What is the minimum length and diameter for a copper-clad steel ground rod for an Earth Electrode Subsystem?
1. 10 feet long and 3/4" inch diameter 2. 8 feet long and 3/4" inch diameter 3. 10 feet long and 1/2" diameter 4. 8 feet long and 1/2" diameter |
10 feet long and 3/4" inch diameter
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What are examples of lightning protection devices?
1. Air terminals, Ground rods, Earth electrodes 2. Down conductors, Guy anchors, Ground rods 3. Air terminals, Down conductors, Ground rods 4. Earth electrodes, Down conductors, Guy anchors |
Air terminals, Down conductors, Ground rods
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What is the recommended size of a down conductor?
1. 6 AWG steel wire 2. 6 AWG copper wire 3. 8 AWG steel wire 4. 8 AWG copper wire |
6 AWG copper wire
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What is the proper bend radius of a down conductor?
1. No less than 6 inches 2. No less than 8 inches 3. No less than 10 inches 4. No less than 12 inches |
No less than 8 inches
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The angle of any bend in a down conductor should be no less than how many degrees?
1. 120 2. 90 3. 60 4. 30 |
90
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What is the minimum length and diameter for a ground rod used in lightning protection?
1. 10 feet long and 3/4 inch diameter 2. 8 feet long and 3/4 inch diameter 3. 10 feet long and 1/2 inch diameter 4. 8 feet long and 1/2 inch diameter |
8 feet long and 1/2 inch diameter
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When are inspections of facility ground systems conducted?
1. Initially, whenever a new facility is constructed 2. After major changes to the facility, structure or equipment are made 3. At least annually 4. All of the above |
All of the above
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RF impedance across bonding and grounding junctions shall not exceed what on a shipboard grounding plane?
1. 10 ohms at 20MHz 2. 5 ohms at 25MHz 3. 25 ohms at 30MHz 4. 30 ohms at 10MHz |
25 ohms at 30MHz
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What type and size cable interconnect earth electrode subsystem grounding rods?
1. 1/0 AWG or larger bare copper cable 2. 2/0 AWG or larger bare copper cable 3. 1/0 AWG or larger steel braided cable 4. 2/0 AWG or larger steel braided cable |
1/0 AWG or larger bare copper cable
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At what distance must a structure be in order to require a separate earth electrode subsystem?
1. 10 feet 2. 20 feet 3. 30 feet 4. 40 feet |
20 feet
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What method is used to determine the resistance of the earth electrode subsystem?
1. Drop of potential method 2. Drop of resistance method 3. Fall of potential method 4. Fall of resistance method |
Fall of potential method
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Which of these materials should not be used for grounding electrode conductors?
1. Copper 2. Aluminum 3. Copper-clad aluminum 4. Stainless steel |
Stainless steel
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True or False. If at all possible, fault protection conductors should be physically separate from signal reference ground conductors except at where they connect to the earth electrode subsystem.
1. True 2. False |
True
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True or False. Metal raceways, ducts and cable trays should be used in lieu of equipment grounding conductors.
1. True 2. False |
False
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Which is not a fault protection device?
1. Fuses 2. GFCI's 3. Circuit Breaker 4. Green buss wire |
Green buss wire
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True or False. Metal frames or enclosures of apparatus shall be connected to the hull, either directly or via the grounding terminal of a receptacle outlet.
1. True 2. False |
True
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A small deformation at the tip of a lightning rod is an example of what type of lightning effect?
1. Thermal effect 2. Mechanical effect 3. Electrical effect 4. Induced voltage effect |
Thermal effect
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Insulation breakdown and component and device failure are an example of what type of lightning effect?
1. Thermal effect 2. Mechanical effect 3. Electrical effect 4. Conductor impedance effect |
Electrical effect
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Where can you find the basic requirements for personnel protection from a lightning strike to a structure?
1. NEC 2. COMDTINST M10550.B 3. NFPA No. 780 4. CIM 11000 4A |
NFPA No. 780
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If a building has a pitched roof, then an air terminal should be placed within how many feet of the ends?
1. 1 foot 2. 1.5 feet 3. 2 feet 4. 2.5 feet |
2 feet
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On down conductors more than 75 feet, the maximum dc resistance shall not be greater than what?
1. 0.088 ohms per 1000 feet 2. 0.088 ohms per 500 feet 3. 0.176 ohms per 1000 feet 4. 0.176 ohms per 500 feet |
0.088 ohms per 1000 feet
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How often should a visual inspection be done to the lightning protection subsystem?
1. Weekly 2. Monthly 3. Bi-Monthly 4. Annual |
Bi-Monthly
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How often should a mechanical inspection be done for a lightning protection subsystem?
1. Weekly 2. Monthly 3. Bi-Monthly 4. Annual |
Annual
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The tip of the air terminal must be a minimum of ___________ inches above the structure?
1. 8 2. 10 3. 12 4. 14 |
14
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Metal objects within sex feet of lightning down conductors should be bonded to the down conductors in order to avoid ______________.
1. Short 2. Ground 3. Induced voltage 4. Flashover |
Flashover
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True or False. The earth electrode subsystem establishes a common point to reference all signals for communications electronics (C-E) equipment by minimizing voltage differences between equipment units.
1. True 2. False |
False
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What ground configuration is preffered for signal ground subsystems for communications electronics (C-E) facilities?
1. Floating ground configuration 2. Single-point ground configuration 3. Multi-point (or equipotential) ground configuration 4. Signal reference ground configuration |
Multi-point (or equipotential) ground configuration
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Which type of equipotential ground plane must be installed during new construction of a facility?
1. Raised floors, with metal panels, stringers or pedestals installed 2. Sub-floor of tile or carpet with a metal sheet laid underneath 3. Overhead in the ceiling above the equipment using a grid 4. Concrete floor with embedded copper grids |
Concrete floor with embedded copper grids
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In a single-point ground system, how many paths are there for the signal reference to ground?
1. One 2. Two 3. Three 4. Four |
One
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When inspecting low frequency equipment, what should the resistance be when measuring between the signal ground terminal and the equipment case?
1. Greater than 10 ohms 2. Greater than 1 megohm 3. Greater than 10 megohm 4. Greater than 1 kohm |
Greater than 1 megohm
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When inspecting fault protection subsystems, what should the resistance be when measuring between the green safety wire and the equipment case?
1. 1ohm or less 2. .1 ohm or less 3. .01 ohm or less 4. .001 ohm or less |
.1 ohm or less
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Electronic and telecommunications equipment are effectively grounded through _______?
1. Capacitive coupling 2. Accidental contact 3. Intentional connection 4. All of the above |
All of the above
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For down conductors less than 75 feet in length what is the maximum dc resistance allowed?
1. 0.088 ohms per 1000 feet 2. 0.088 ohms per 500 feet 3. 0.176 ohms per 1000 feet 4. 0.176 ohms per 500 feet |
0.176 ohms per 1000 feet
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________ from buried electrodes entering buildings often serve as the principal ground point for connections to equipment ground systems.
1. Down conductors 2. Extensions 3. Green wires 4. White wires |
Extensions
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For metallic and non-metallic hull ships, all Class ____ extensions to the ship's ground potential shall be designated as the ship's ground plane.
1. A 2. B 3. C 4. D |
A
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To reduce the possibility of ___________ effects, cables that terminate electronic devices (such as power, signal, and control lines) should not be run in parallel to down conductors.
1. Mechanical 2. Flashover 3. Electrical 4. Induced voltage |
Induced voltage
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Due to __________ effects, all elements of the lightning protection subsystem must be securely fastened.
1. Mechanical 2. Electrical 3. Flashover 4. Induced voltage |
Mechanical
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Field changes are issued by __________.
1. CG-643 2. SMEF 3. ELC 4. Both A and B |
Both A and B
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Which type of field change furnishes documentation, parts, and special tools required to complete a change.
1. Type 1 2. Type 2 3. Type 3 4. Type 4 |
Type 1
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Which type of field change furnishes documentation only?
1. Type 1 2. Type 2 3. Type 3 4. Type 4 |
Type 2
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Which type of field change furnishes documentation and some of the required parts or special tools?
1. Type 1 2. Type 2 3. Type 3 4. Type 4 |
Type 3
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Which type of field change implements changes to technical documentation only and requires no alteration to the equipment?
1. Type 1 2. Type 2 3. Type 3 4. Type 4 |
Type 4
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What / Who is the authority for the installation of a field change?
1. ELC 2. MLC 3. Field change bulletin 4. COMDINST M10550.B |
Field change bulletin
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Coast Guard field changes are numbered consecutively starting with what number?
1. 1 2. 31 3. 51 4. 91 |
91
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Navy field changes are numbered consecutively starting with what number?
1. 1 2. 31 3. 51 4. 91 |
1
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How many Navy class designations are there for field changes?
1. 1 2. 3 3. 5 4. 7 |
3
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Where can you find the published field changes to Navy and commercial equipment?
1. Field change bulletins 2. Errata sheet 3. Equipment Systems Information Bulletin (ESIB) 4. ELC |
Equipment Systems Information Bulletin (ESIB)
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What is issued when minor mistakes have been made in a field change bulletin?
1. CASCOR 2. Depot change 3. Equipment Systems Information Bulletin (ESIB) 4. Errata sheet |
Errata sheet
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What is a modification consisting of component changes to modules, subassemblies, or equipment and may be provided as a part of a Type 1 or Type 3 field change?
1. Emergency alteration 2. Field change parts kit 3. Depot change 4. Errata sheet |
Emergency alteration
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True or False. The multi-cable transit (MCT) device is a modular system that utilizes standard units and dimensions to allow minimum flexibility and compatibility with various numbers and sizes of cables
1. True 2. False |
False
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Where would you find complete installation and assembly instructions for multi-cable transit devices?
1. COMDINST M10550.B 2. ELC website 3. DOD-STD-2003 (NAVY) 4. EIM 160 (NAVSEA) |
DOD-STD-2003 (NAVY)
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True or False. Cable identification tags shall be installed on all permanently installed cables as close as practicable to each point of termination, on both sides of decks and bulkheads, and no more than 50 ft. apart.
1. True 2. False |
True
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In cable tag number 2R - ES403 what does the 2 represent?
1. Cable segregation marking 2. System designation marking 3. System cable number 4. Identical system number |
Identical system number
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Which cable function marking stands for radar remote indicators?
1. ER 2. RR 3. RS 4. RT |
ER
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Which cable function marking stands for Surface search radar?
1. ES 2. RS 3. RT 4. RN |
ES
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Which cable function marking stands for radio teletype?
1. RT 2. RN 3. RY 4. RS |
RY
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True or False. A spare conductor shall have nothing written on the conductor tag?
1. True 2. False |
False
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What are cable tags made of?
1. Copper 2. Zinc 3. Brushed nickel 4. Soft aluminum |
Soft aluminum
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NAVSEA SE000-00-____________ may be used for test methods and guidance for testing of coaxial cables.
1. EIM-130 2. EIM-120 3. EIM-110 4. EIM-100 |
EIM-130
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The guidelines listed in __________ Section 5-2.10 for Quality Control inspections of waveguides shall apply to rigid coaxial transmission lines.
1. EIM-130 2. EIM-120 3. EIM-110 4. EIM-100 |
EIM-110
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True or False. Attenuation and VSWR tests shall be conducted on all flexible and semi-rigid coaxial cables.
1. True 2. False |
True
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True or False. Cables installed in shipboard electronic systems shall receive visual inspections, continuity checks and insulation resistance tests prior to de-energizing of equipment.
1. True 2. False |
False
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Insulation resistance measurements for multiconductor cables with conductors of less than 1700 circular mil area in size shall have a minumum resistance value of _______ ohms.
1. 20,000 2. 30,000 3. 40,000 4. 50,000 |
50,000
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True or False. Andrew Corporation includes specific installation instructions with each HELIAX cable connector package.
1. True 2. False |
True
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A spare conductor shall have "____" written on the conductor tag
1. extra 2. disconnected 3. spare 4. additional |
spare
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Coax cables with polyethylene or polytetrafluorethylene (Teflon) dielectric and a length of 100 feet (or less) shall have an insulation resistance greater than or equal to ______ megaohms?
1. 10,000 2. 20,000 3. 30,000 4. 40,000 |
40,000
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When should cables installed in shipboard electronic systems receive visual inspections, continuity checks, and insulation resistance tests?
1. Upon entering port after deployment 2. Prior to energizing of equipment 3. Quarterly 4. Monthly |
Prior to energizing of equipment
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Cables not meeting the minimum insulation resistance values shall be ____________.
1. Megged 2. Kept 3. Replaced 4. Reinsulated |
Replaced
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A complete field change package consists of the field change bulletin and a __________.
1. Field change parts kit 2. Errata sheet 3. SMEF report 4. (ESIB) Equipment Systems Information Bulletin |
Field change parts kit
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If the service-entrance conductor is copper wire size 1, what size copper wire should be used for the grounding electrode conductor for the AC system?
1. Wire size no. 2 2. Wire size no. 4 3. Wire size no. 6 4. Wire size no. 8 |
Wire size no. 6
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If the current rating of the overcurrent protection device is 500, what is the minimum copper wire size for the equipment-grounding conductor?
1. Wire size no. 2 2. Wire size no. 4 3. Wire size no. 6 4. Wire size no. 8 |
Wire size no. 2
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Roof and down conductors must be a separate ________ cable, continuous, unspliced and installed in as straight a line as possible in order to provide a low-impedance path from the highest conductive surface (air terminal) to the main ground connection point.
1. 0000 AWG 2. 0010 AWG 3. 0016 AWG 4. 0014 AWG |
0000 AWG
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