C7 Testing & Commissioning Procedures 2

Question 1

During commissioning of a fire alarm system, which test verifies that all notification appliances activate within the required decibel threshold?

Accepted Answer

Sound pressure level test

Answer

A sound pressure level test uses a calibrated meter to confirm notification appliances meet the minimum 15 dB above ambient (or 70 dB minimum) per NFPA 72.

Question 2

When commissioning a CCTV system, what is the primary purpose of performing a back-focus adjustment?

Accepted Answer

To ensure the image remains sharp across the zoom range

Answer

Back-focus adjustment aligns the imaging sensor with the lens focal plane so the image stays sharp at both wide and telephoto zoom positions.

Question 3

A C7 contractor is testing an access control door strike. The door fails to unlock when the credential is presented. Which component should be tested first?

Accepted Answer

The power supply output voltage at the strike

Answer

Verifying supply voltage at the strike confirms whether the fault is in power delivery before checking control logic or credential hardware.

Question 4

What does a time-domain reflectometer (TDR) measure during cable commissioning?

Accepted Answer

Distance to a cable fault or impedance discontinuity

Answer

A TDR sends a pulse down the cable and measures the time for reflections to return, identifying the distance to faults or impedance changes.

Question 5

During commissioning of a nurse call system, which test confirms that a call initiated at a patient station correctly annunciates at the central console?

Accepted Answer

End-to-end functional test

Answer

An end-to-end functional test activates each station individually and verifies the correct zone and priority display at the master console.

(C7) California C7 Low Voltage Systems Contractor Certification Practice Test

(C7) California C7 Low Voltage Systems Contractor Certification Practice Test

C7 Testing & Commissioning Procedures 2