California Low Voltage Systems
Contractor (C-7) Exam With Actual
Questions & Verified Answers,Plus
Rationales/Expert Verified For
Guaranteed Pass Graded A+/2026
/Latest Update/Instant Download Pdf
1. Which of the following is considered a low-voltage system?
A. 240V lighting circuit
B. 120V outlet
C. 24V thermostat circuit
D. 277V lighting system
Rationale: Low-voltage systems operate below 91 volts; a 24V
thermostat circuit falls under this category._
2. What is the main purpose of a Category 6 (Cat6) cable?
A. Power transmission
B. Data and networking
C. Audio signal transfer
D. Fire alarm circuits
Rationale: Cat6 cables are designed for high-speed data transmission in
network systems._
3. The maximum voltage rating for low-voltage systems in California is:
A. 50 volts
B. 91 volts
C. 120 volts
D. 240 volts
, Rationale: The C-7 classification applies to systems that operate at 91
volts or less._
4. Which wire color is typically used for a 24V control system common?
A. Red
B. White
C. Green
D. Blue
Rationale: In HVAC and low-voltage control systems, the white wire is
often used as the common (C) wire._
5. The minimum bend radius of a Category 5e cable should be:
A. Equal to the cable diameter
B. 2 times the cable diameter
C. 4 times the cable diameter
D. 8 times the cable diameter
Rationale: The recommended bend radius for Cat5e cable is at least 4
times its diameter to prevent signal loss._
6. What component converts AC power to DC for low-voltage systems?
A. Transformer
B. Power supply
C. Rectifier only
D. Inverter
Rationale: A power supply converts AC to DC voltage suitable for low-
voltage systems._
7. What is the standard impedance for coaxial cable used in CCTV systems?
A. 50 ohms
B. 75 ohms
C. 100 ohms
D. 120 ohms
Rationale: CCTV systems use 75-ohm coaxial cable for optimal video
signal transmission._
8. In a fire alarm system, the signaling line circuit (SLC) is used to:
A. Power all devices
B. Communicate between control panel and devices
, C. Provide ground connection
D. Supply 120V power
Rationale: The SLC carries digital communication signals between fire
alarm components._
9. Which tool is essential for testing network cable continuity?
A. Clamp meter
B. Oscilloscope
C. Cable tester
D. Voltmeter
Rationale: A cable tester verifies continuity and pin configuration in
network cabling._
10.What color wire is commonly used for ground in low-voltage systems?
A. White
B. Red
C. Blue
D. Green
Rationale: Green or bare wire is universally used for grounding._
11.What type of connector is used for coaxial cable?
A. RJ-45
B. RJ-11
C. BNC
D. SC
Rationale: BNC connectors are standard for coaxial cable in video and
security systems._
12.Which of the following systems can be installed under a C-7 license?
A. Electrical power distribution
B. Plumbing control
C. Intercom systems
D. HVAC ductwork
Rationale: The C-7 license allows installation of communication,
intercom, and low-voltage signal systems._
Contractor (C-7) Exam With Actual
Questions & Verified Answers,Plus
Rationales/Expert Verified For
Guaranteed Pass Graded A+/2026
/Latest Update/Instant Download Pdf
1. Which of the following is considered a low-voltage system?
A. 240V lighting circuit
B. 120V outlet
C. 24V thermostat circuit
D. 277V lighting system
Rationale: Low-voltage systems operate below 91 volts; a 24V
thermostat circuit falls under this category._
2. What is the main purpose of a Category 6 (Cat6) cable?
A. Power transmission
B. Data and networking
C. Audio signal transfer
D. Fire alarm circuits
Rationale: Cat6 cables are designed for high-speed data transmission in
network systems._
3. The maximum voltage rating for low-voltage systems in California is:
A. 50 volts
B. 91 volts
C. 120 volts
D. 240 volts
, Rationale: The C-7 classification applies to systems that operate at 91
volts or less._
4. Which wire color is typically used for a 24V control system common?
A. Red
B. White
C. Green
D. Blue
Rationale: In HVAC and low-voltage control systems, the white wire is
often used as the common (C) wire._
5. The minimum bend radius of a Category 5e cable should be:
A. Equal to the cable diameter
B. 2 times the cable diameter
C. 4 times the cable diameter
D. 8 times the cable diameter
Rationale: The recommended bend radius for Cat5e cable is at least 4
times its diameter to prevent signal loss._
6. What component converts AC power to DC for low-voltage systems?
A. Transformer
B. Power supply
C. Rectifier only
D. Inverter
Rationale: A power supply converts AC to DC voltage suitable for low-
voltage systems._
7. What is the standard impedance for coaxial cable used in CCTV systems?
A. 50 ohms
B. 75 ohms
C. 100 ohms
D. 120 ohms
Rationale: CCTV systems use 75-ohm coaxial cable for optimal video
signal transmission._
8. In a fire alarm system, the signaling line circuit (SLC) is used to:
A. Power all devices
B. Communicate between control panel and devices
, C. Provide ground connection
D. Supply 120V power
Rationale: The SLC carries digital communication signals between fire
alarm components._
9. Which tool is essential for testing network cable continuity?
A. Clamp meter
B. Oscilloscope
C. Cable tester
D. Voltmeter
Rationale: A cable tester verifies continuity and pin configuration in
network cabling._
10.What color wire is commonly used for ground in low-voltage systems?
A. White
B. Red
C. Blue
D. Green
Rationale: Green or bare wire is universally used for grounding._
11.What type of connector is used for coaxial cable?
A. RJ-45
B. RJ-11
C. BNC
D. SC
Rationale: BNC connectors are standard for coaxial cable in video and
security systems._
12.Which of the following systems can be installed under a C-7 license?
A. Electrical power distribution
B. Plumbing control
C. Intercom systems
D. HVAC ductwork
Rationale: The C-7 license allows installation of communication,
intercom, and low-voltage signal systems._
