official flash cards construction seminars
Nonshielded conductors over 750V
shall be _____
Grounded
What is the minimum distance that is
allowed between switchgear and an
outdoor oil storage tank?
10 ft
What is the minimum vertical separation
on a pole between the supply cable and
the lowest communication attachment?
16”
The vertical clearance for insulated
communication conductors above or
crossing railroad tracks shall be ___feet.
23.5
Minimum clearance for non-insulated
communication conductors over
pedestrian walkways shall be ____ feet.
12
Minimum clearance of open supply
conductors over 750V to 22KV crossing
over bridges shall be ____ feet.
5.5
The minimum vertical clearance between
ordinary supply conductors over 8.7 kV and
communication conductors shall be
____inches.
40 plus .4 per kV over 8.7 kV
Backfill within 6” of conduit should be
free of solid material greater than ____
maximum dimension.
4”
In underground structures, horizontal runs
of supply cables shall be supported at least ____
above the floor.
3”
What is the minimum burial depth for
a 22 kV conductor?
30”
What is the minimum flush burial
depth of a 500 volt conductor?
24”
Bonding shall be provided between all
above ground metallic power and
communications apparatus that are
separated ____ or less.
6 ft
According to the NESC, fall protection is required for over ___feet of elevation.
10
A buried ___ shall be used to bond across a gate, unless a
nonconducting fence section is used.
bonding jumper
Where guarding is required, grounding
conductor guards should extend for not
less than feet above the ground or
platform from which the grounding
conductors are accessible to the public.
8
Strips of metal not less than____ in total length constitute an acceptably made electrode.
10 ft
In areas with high soil sensitivity or shallow bedrock, buried strips of metal not less than in total length, constitute an acceptably made electrode.
10 ft
Pole butt plates shall not be less than thick.
1/4”
Copper wire wrap shall have a continuous bare length below the
ground level not less than___ feet.
12
Copper wire wrap shall not be smaller than ___
6 AWG
Minimum overhang for insulated communication conductors over roads and parking lots shall be feet.
15.5
The supplier or contractor that installs house fire warning is required to provide the building owner with all the following materials except:
drawings that show the interconnection of tandem connected detectors
On a beam ceiling where the beams are less than 12” in depth and spacing is less than 96”, where should the smoke detectors be mounted?
bottom of beam
The maximum air velocity for a smoke detector is ____
300 fpm
Given: A smoke detection system is being installed to automatically close a double door way in response to smoke blowing in either direction. The ceiling is smooth. Where must the smoke detector be installed?
on the centerline of the doorway
Visible notification appliances located in corridors shall be space no more than ____ feet apart.
100
On a voice alarm system, what is the minimum number of cycles it has to report an evacuation procedure?
2
A single story dwelling unit has two bedrooms that are not located near to one another. What is the minimum required number of smoke alarms required?
4
Heat detectors used within a single family unit must be listed or approved for not less than spacing.
50’
What is a privately owned and monitored alarm system classified as?
proprietary system
What is a decibel?
1/10th of a bell
Notification appliances of a local protective signaling system must include____ on their nameplate?
Electrical requirements and rated audible or visible performance.
A fire alarm system is required or a visible notification device when the ambient sound is greater than?
105 dBa
What is the maximum blink rate on a strobe light on a notification appliance per second?
2
What is the maximum interval that a fire alarm signal is allowed at the console?
15 seconds
What is the detector that is mounted on the ceiling or wall that reacts to convected thermal reaction?
heat detector
Components that are non fire alarm and connected commonly to fire alarm components are considered what type of system?
combination system
Pad mounted equipment shall not be located less than___ feet from fire hydrants.
4
Electrical power is measured in
Watts
You have a frequency that has been amplified to four frequencies. This change is called:
frequency multiplexing
What type of network is not considered multipoint?
point to point
When a company ties together different devices such as computers and printers, what is the result?
a network
Which part of a power supply converts electrical current from AC to DC?
rectifier
The standard impedance of a video coaxial cable is ___ ohms.
75
Telecom wire is grounded on each end. What is the electrical path called?
ground loop
A voltmeter will test all of the following EXCEPT:
power
What are the disadvantages of fiber optics over copper?
cost
What is the measurement of the amount of signal for fiber optics?
Bandwidth
Switch S1 is in the on position but light L does not come on. Voltage across S1 is measured to be 120 volts. Voltage across L1 is measured to be 0 volts. The light does not come on because: the lamp is good but the switch does not ____
make contact
Which of the following materials is commonly used as an anode?
Magnesium
A length of coax used for data is terminated at one end with a 50 ohm terminator. The resistance between the shield and the center conductor at the other end of the cable is 0 ohms. This indicated the cable continuity is_____
Shorted
What is the potential difference between any two points in a circuit?
voltage
Ohms law states that the current is inversely proportioned to the Resistance What is the classification for a low voltage electrical system which current flows through continuously, except when the circuit is open to allow a signal to be sent?
Closed
Given: A purple light appears when the electrodec wire of a neon lamp is tested with a high tension spark coil. what is the gas pressure inside the tube?
a minimum of 50mm under green
Given: Two (2) electric discharge signs are identical except for the tubing. The tubing inside ‘A’ has a smaller diameter than the tubing inside ‘B’. Which of the following statements comparing the two signs is true?
the load impedance in sign A is greater than that of sign B
Corrosion currents are usually measured in?
Milliamps
A brass service cock in a steel line would tend to become the:
Cathode
When the source and load impedance are made equal so that a maximum transfer of power occurs with minimal distortion, What has been accomplished?
Impedance matching
The ratio between a sound level that is just audible to a person with average hearing and other sound levels is indicated in?
Decibels
What device that corrects an impedance mismatch is used to connect cables to other cables or equipment?
Balun
The technician does not connect a terminator on an unused splitter port at the end of a TV distribution line. Which of the following errors may be caused?
signal reflections or ghosting
What keeps the alarm circuit activated and the output device operating even if the protective circuit is restored to normal?
latching relay
Office telecommunication cables are routed into designated local cable rooms that functions as remote cable distribution points for room connections. This strategy is called a:
3 point connection
What depth is a 40 foot wood pole set?
6 feet
A primary advantage that optical fiber has over copper cable pairs, is that a fiber optic transmission offers:
EMI immunity
Given: Hard wired alarm system control panels should be installed so that they help reduce magnetic downtime and false alarms. Electromagnetic interference must be prevented from entering the system control panel and causing interference. Which of the following eliminates EMI?
fiber optic cable
An ohmmeter reading of zero ohms indicates which of the following?
a short circuit
A voltmeter is used to measure:
electric pressure
An ohm meter reading of infinity indicates which of the following conditions?
Open circuit
Electrical pressure or electromotive force is measured in
volts
The ability of a material to PERMIT the flow of electrons through it is called?
conductance
All of the following are incandescent lamp base types except:
Standard
With the settings set to low on an ammeter, what will happen if you wrap the wire around twice?
Double the reading
An alternator produces what type of power?
AC
It is customary to refer to electromotive force as?
voltage
How are fuses rated?
both amperes and voltage
What procedure helps defeat tampering with a shunt lock on older systems?
wiring the shunt lock directly to the alarm panel
When a signal is detected, power is applied to the circuit triggering the annunciator and when power is no longer applied, the annunciator continues because of what relay type?
drop latch
All of the following are space detectors except?
bill trap detector
On an Electrical diagram, what does the symbol S2 indicate?
one double pole switch
What is the main function of the drop relay in an closed circuit security alarm system?
to latch the coil to keep the circuit in the alarm condition
Which of these detectors uses a microphone?
audio
How many volts should be expected between the red and white conductors on an energized circuit containing black, red, green and white conductors?
120 volts
One ampere is defined as the flow rate current per second of one:
coulomb
Which of the following opens and closes or interrupts the voltage or power?
relay
A television signal is measured in which of the following?
megahertz
Which one of these switching systems places many inter leveled telephone conversations onto one telephone line?
time division multiplexing
According to the Lineman’s and Cableman’s Handbook, is the advantage of wood distribution poles to concrete poles.
cost
According to the Lineman’s and Cableman’s Handbook, the recommended hole depth for a 50’ wood pole set in soil is at least:
7’
The total opposition to AC in a circuit which includes resistance, inductance and capacitance is called?
electrical impedance
What connection using 3 resistors will provide maximum total resistance?
all 3 resistors in series
A current that leaves its intended path and returns to the source bypassing the load causes the circuit to be:
shorted
When installing a half inch format camera, looking at the building 30’ away, and it is 18’ in height and 22’ wide, what is the mm lens size that is required?
8 mm
What is the benefit of a covert cctv system over an overt system?
catch a repeated offender
On a screen, what will give you the greatest number of views?
multiplexer
What is a conductor’s insulation rating based on?
Circuit voltage
Which of the following affects the resistance of a conductor?
material
What type of output is preferred when selecting an amplifier for a 5 speaker public address system install?
ease of matching impedance
Windings in a transformer go around a:
Core
Cable TV coax can be tested by using what?
digital multimeter
What does CCTV stand for?
Closed circuit television
What is the maximum bandwidth of a standard television channel?
8 mhz
A three phase system has no voltage to the neutral load. What is the minimum size neutral needed?
No neutral needed
Which of the following is mandatory code:
NEC Article 770
What causes a sound system to hum/buzz?
ground loop problems
Which of the following has the most resistance?
Poor connection
What type of connector is used for RG- 6 cabling?
Type F
What is used to test batteries?
Voltmeter and load
What is another name for frequency?
Band
What does the number “2” represent in THW-2?
90°C Temperature Rating
What is the name of the typical coax connector?
Type F
An ammeter measures:
Current
Any intentional alteration of frequency response including tone control is termed
equalization
