What is the voltage limit that defines Alabama Low Voltage Special Systems work under this specialty classification?
General Low Voltage
Question · Medium
Which NEC article covers Class 1, Class 2, and Class 3 remote-control, signaling, and power-limited circuits?
Electrical Electronics
Which NEC article specifically covers fire alarm system wiring and equipment?
Fire Alarm
Trades Exam Prep Podcast
Listen on Spotify
Podcast
Ohm’s Law states that voltage (V) equals which relationship?
A 24 VDC power supply is feeding a load that draws 2 A. What is the load resistance?
Power in a DC circuit is calculated as which of the following?
Under NEC Article 725, Class 2 and Class 3 circuits are distinguished primarily by which characteristic?
Which cable marking is appropriate for Class 2 circuits installed in a plenum air-handling space?
Conductors
What does the letter “R” indicate in cable type FPLR?
Which power-limited fire alarm cable type is required in plenum spaces?
Question · Easy
According to TIA-568 structured cabling standards, what is the maximum permanent-link length for horizontal copper cable?
Data Voice
Question · Hard
What is the characteristic impedance of Category 5e and Category 6 UTP cable?
What is the typical minimum bend radius for Category 6 UTP cable during installation?
Installation Standards
What is the recommended maximum pulling tension for standard 4-pair UTP cable?
In the T568B pinout, which pair colors occupy pins 1 and 2?
What is the primary purpose of an equipment grounding conductor on metallic enclosures and raceways?
Grounding Bonding
Where communications cables enter a building, NEC Article 800 generally requires what protective device?
A telecommunications grounding busbar (TGB) is primarily used to:
What is the main function of electrical power conditioning equipment in a low-voltage system?
Power Conditioning
An uninterruptible power supply (UPS) primarily protects low-voltage equipment from which condition?
What type of intrusion sensor detects changes in infrared energy caused by a person moving through its field of view?
Intrusion Alarms
A magnetic door contact (door switch) typically signals the alarm panel when:
What is the function of an end-of-line resistor (EOLR) on a conventional initiating device circuit?
Per NFPA 72, secondary power for a fire alarm system generally must support at least which standby and alarm duration?
NFPA 72’s standard fire alarm evacuation signal uses which audible pattern?
On a smooth ceiling, NFPA 72 generally limits spot-type smoke detector spacing to about how far between detectors?
A photoelectric smoke detector primarily detects smoke by which principle?
What is the principal advantage of an addressable fire alarm system over a conventional zoned system?
In an addressable fire alarm SLC, what is the role of an isolation module?
When low-voltage cables penetrate a fire-rated wall or floor, the penetration must be firestopped to:
PoE (Power over Ethernet) delivers power and data over which medium?
Under IEEE 802.3at (PoE+), approximately how much power is available at the powered device?
What is the standard modular connector used at work-area outlets for Category cable Ethernet terminations?
NEXT in copper cable testing stands for:
Testing Equipment
A wire-map test on a newly terminated Cat 6 run primarily verifies:
An OTDR is primarily used to:
Compared with multimode fiber, single-mode fiber typically has:
Which NEC article covers optical fiber cables and raceways?
Which cable type is commonly required for nonconductive optical fiber in a plenum?
In a commercial sound system, the common constant-voltage distribution methods are:
Sound Video
Impedance matching in a 70 V distributed sound system is primarily accomplished by:
Which NEC article addresses audio signal processing, amplification, and reproduction equipment?
Balanced audio lines are preferred on long microphone/line runs because they:
For analog CCTV over coax, which cable type is most commonly used?
Cctv
Modern IP CCTV cameras typically connect to the network using:
What is the primary function of a Network Video Recorder (NVR)?
Which NEC article covers community antenna television and radio distribution systems (CATV)?
Catv Matv
Loading more…