AZ L-71 CCTV & Security Systems
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
Download Pdf
1. What is the primary purpose of a CCTV system?
A. To increase electrical service capacity
B. To provide visual surveillance and monitoring
C. To regulate building temperature
D. To control plumbing pressure
Answer: B. To provide visual surveillance and monitoring
Rationale: CCTV systems are designed primarily to capture, transmit,
record, and display video for surveillance and security purposes.
2. Which camera feature determines the amount of light entering the
lens?
,A. Shutter
B. Iris
C. Encoder
D. DVR
Answer: B. Iris
Rationale: The iris controls the lens opening and therefore regulates the
amount of light reaching the camera sensor.
3. What does DVR stand for?
A. Digital Video Recorder
B. Direct Voltage Relay
C. Digital Verification Receiver
D. Data Video Router
Answer: A. Digital Video Recorder
Rationale: A DVR records video, commonly from analog or analog-over-
coax surveillance cameras, in digital form.
4. What does NVR stand for?
A. Network Voltage Regulator
B. Network Video Recorder
,C. Numeric Video Relay
D. Network Visual Receiver
Answer: B. Network Video Recorder
Rationale: An NVR records video streams delivered over a network,
commonly from IP cameras.
5. Which camera type can automatically change its viewing direction
horizontally and vertically?
A. Fixed camera
B. PTZ camera
C. Dome-only camera
D. Thermal sensor
Answer: B. PTZ camera
Rationale: PTZ means pan, tilt, and zoom, allowing the camera to change
its viewing direction and magnification.
6. What is the main purpose of a camera's focal length?
A. To determine electrical voltage
B. To influence field of view and magnification
C. To determine cable resistance
D. To control alarm sound volume
, Answer: B. To influence field of view and magnification
Rationale: Lens focal length affects the camera's field of view and the
apparent size of objects in the image.
7. Which lens generally provides a wider field of view?
A. Shorter focal-length lens
B. Longer focal-length lens
C. Telephoto lens
D. Fixed long-range lens
Answer: A. Shorter focal-length lens
Rationale: Short focal lengths generally produce wider fields of view, while
longer focal lengths provide narrower views and greater magnification.
8. What is the principal function of infrared illumination on a security
camera?
A. Increase network bandwidth
B. Provide illumination for nighttime imaging
C. Encrypt video
D. Power the camera
Answer: B. Provide illumination for nighttime imaging
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
Download Pdf
1. What is the primary purpose of a CCTV system?
A. To increase electrical service capacity
B. To provide visual surveillance and monitoring
C. To regulate building temperature
D. To control plumbing pressure
Answer: B. To provide visual surveillance and monitoring
Rationale: CCTV systems are designed primarily to capture, transmit,
record, and display video for surveillance and security purposes.
2. Which camera feature determines the amount of light entering the
lens?
,A. Shutter
B. Iris
C. Encoder
D. DVR
Answer: B. Iris
Rationale: The iris controls the lens opening and therefore regulates the
amount of light reaching the camera sensor.
3. What does DVR stand for?
A. Digital Video Recorder
B. Direct Voltage Relay
C. Digital Verification Receiver
D. Data Video Router
Answer: A. Digital Video Recorder
Rationale: A DVR records video, commonly from analog or analog-over-
coax surveillance cameras, in digital form.
4. What does NVR stand for?
A. Network Voltage Regulator
B. Network Video Recorder
,C. Numeric Video Relay
D. Network Visual Receiver
Answer: B. Network Video Recorder
Rationale: An NVR records video streams delivered over a network,
commonly from IP cameras.
5. Which camera type can automatically change its viewing direction
horizontally and vertically?
A. Fixed camera
B. PTZ camera
C. Dome-only camera
D. Thermal sensor
Answer: B. PTZ camera
Rationale: PTZ means pan, tilt, and zoom, allowing the camera to change
its viewing direction and magnification.
6. What is the main purpose of a camera's focal length?
A. To determine electrical voltage
B. To influence field of view and magnification
C. To determine cable resistance
D. To control alarm sound volume
, Answer: B. To influence field of view and magnification
Rationale: Lens focal length affects the camera's field of view and the
apparent size of objects in the image.
7. Which lens generally provides a wider field of view?
A. Shorter focal-length lens
B. Longer focal-length lens
C. Telephoto lens
D. Fixed long-range lens
Answer: A. Shorter focal-length lens
Rationale: Short focal lengths generally produce wider fields of view, while
longer focal lengths provide narrower views and greater magnification.
8. What is the principal function of infrared illumination on a security
camera?
A. Increase network bandwidth
B. Provide illumination for nighttime imaging
C. Encrypt video
D. Power the camera
Answer: B. Provide illumination for nighttime imaging
