20+ Cctv Technician Interview Questions and Answers

A 3+1 cable is a type of cable used in CCTV systems, with three cables for video transmission and one cable for power supply.

• A 3+1 cable consists of three cables for video transmission and one cable for power supply.

• The three video cables are typically used for transmitting the video signal from the CCTV camera to the recording device.

• The power supply cable is used to provide power to the CCTV camera.

• This type of cable is commonly used in CCTV installations to simplify the wi...read more

Yes

• Yes, I have experience in casing/casing, conduit/concealed wiring, CCTV erection, and maintenance work.

• I possess knowledge of computer software and hardware related to CCTV systems.

• I am familiar with the process of casing/casing, which involves enclosing cables in protective casings or conduits.

• I have expertise in conduit/concealed wiring, which involves running cables through concealed pathways to maintain a neat and organized appearance.

• I am skilled in CCTV erection and ...read more

DVR stands for Digital Video Recorder, a device that records and stores video footage from surveillance cameras.

• DVRs are commonly used in security systems to monitor and record activity in a specific area.

• They can be connected to multiple cameras and can store footage for a certain period of time.

• DVRs can also be accessed remotely through a network connection.

• They have largely replaced analog VCRs in surveillance systems due to their higher quality and reliability.

• Examples of...read more

A power supply is a device that provides electrical energy to an electrical load.

• A power supply converts input voltage into the desired output voltage or current.

• It ensures that the electrical load receives a stable and reliable power source.

• Power supplies can be found in various electronic devices such as computers, televisions, and smartphones.

• Examples of power supplies include AC adapters, batteries, and power distribution units (PDUs).

A hard disk is a data storage device that uses magnetic storage to store and retrieve digital information.

• A hard disk is a non-volatile storage device that is used to store and retrieve digital data.

• It consists of one or more rigid platters coated with a magnetic material.

• Data is written and read using a magnetic head that moves across the platters.

• Hard disks are commonly used in computers, servers, and CCTV systems to store video footage.

• They provide large storage capacities...read more

To give power to a camera, you need to connect it to a power source using a power cable or adapter.

• Cameras typically require a DC power supply.

• The power cable or adapter should match the camera's power requirements.

• Ensure the power source is compatible with the camera's voltage and current needs.

• Connect the power cable to the camera's power input port.

• Plug the other end of the power cable into a power outlet or a power distribution unit (PDU).

NVR stands for Network Video Recorder.

• NVR is a device used to record and store video footage from IP cameras.

• It is connected to a network and can be accessed remotely.

• NVRs typically have built-in storage and can support multiple cameras.

• They offer advanced features like motion detection, video analytics, and remote viewing.

• NVRs are commonly used in surveillance systems for homes, businesses, and public spaces.

To switch to camera Laying cable properly and install camera, follow these steps:

• Start by planning the cable route and ensuring it is free from obstacles

• Measure and cut the cable to the required length

• Secure the cable using appropriate clips or conduit

• Connect the cable to the camera and power source

• Mount the camera securely on the desired location

• Adjust the camera angle and focus for optimal view

• Test the camera to ensure it is functioning properly

An adaptor is a device that allows different types of plugs or connectors to be used together.

• Adaptors can be used to convert a USB port to a serial port.

• They can also be used to convert a European plug to a UK plug.

• Adaptors can be passive or active, with active adaptors having additional circuitry to convert signals.

• Adaptors can be used in a variety of industries, including electronics, telecommunications, and power distribution.

Coaxial cable is used for AHD cameras and Ethernet cable is used for IP cameras.

• Coaxial cable is commonly used for AHD cameras because it can transmit high-definition video signals over long distances without loss of quality.

• Ethernet cable, such as Cat5e or Cat6, is typically used for IP cameras as it allows for power and data transmission over a single cable.

• AHD cameras require BNC connectors for coaxial cable, while IP cameras use RJ45 connectors for Ethernet cable.

There are several types of CCTV cameras available in the market, including dome cameras, bullet cameras, PTZ cameras, and more.

• Dome cameras: These are typically used for indoor surveillance and have a dome-shaped design to blend in with the surroundings.

• Bullet cameras: These are long and cylindrical in shape, ideal for outdoor use due to their weatherproof design.

• PTZ cameras: Pan-tilt-zoom cameras can be remotely controlled to pan, tilt, and zoom to capture different angles a...read more

Yes, I have 3 years of experience in CCTV cameras.

• I have worked with various types of CCTV cameras, including analog and IP cameras.

• I am proficient in installing, configuring, and troubleshooting CCTV systems.

• I have a strong understanding of video surveillance principles and best practices.

• I have experience in setting up DVRs, NVRs, and video management software.

• I am familiar with different camera brands and models, such as Hikvision, Dahua, and Axis.

• I have knowledge of netwo...read more

3+1 cable typically refers to a CCTV cable with 3 video connections and 1 power connection.

• 3+1 cable is commonly used for CCTV installations to connect cameras to the DVR or monitor.

• The 3 video connections are typically for video transmission (e.g. video signal, audio signal, ground) and the 1 power connection is for supplying power to the camera.

• Examples of 3+1 cables include RG59 coaxial cables with a power wire or Siamese cables with separate video and power lines.

There are several types of CCTV cameras, including dome cameras, bullet cameras, PTZ cameras, and covert cameras.

• Dome cameras: These cameras are typically mounted on ceilings and provide a 360-degree view.

• Bullet cameras: These cameras are long and cylindrical in shape, often used for outdoor surveillance.

• PTZ cameras: PTZ stands for Pan-Tilt-Zoom, allowing the camera to move and zoom in on specific areas.

• Covert cameras: These cameras are designed to be hidden or disguised, oft...read more

To set up a DVR or NVR, you need to connect cameras, configure settings, set up recording schedules, and ensure remote access.

• Connect cameras to the DVR/NVR using appropriate cables

• Access the settings menu on the DVR/NVR to configure recording resolution, motion detection, and other preferences

• Set up recording schedules to specify when and for how long the cameras should record

• Ensure remote access by setting up network configurations and enabling mobile viewing options

Coaxial cable is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a conductive layer.

• Consists of a central conductor, insulating layer, conductive shield, and outer insulating layer

• Used for transmitting high-frequency signals with low loss

• Commonly used in cable television, internet connections, and security camera systems

There are several types of CCTV systems, including analog, IP, wireless, dome, bullet, PTZ, and thermal cameras.

• Analog CCTV systems use analog cameras and DVRs to record footage.

• IP CCTV systems use network cameras and NVRs to record footage.

• Wireless CCTV systems eliminate the need for cables by transmitting footage wirelessly.

• Dome cameras are discreet and often used for indoor surveillance.

• Bullet cameras are more visible and used for outdoor surveillance.

• PTZ (Pan-Tilt-Zoom) c...read more

To gain experience in the CCTV field, one can start by pursuing relevant education and certifications, seeking internships or entry-level positions, and staying updated on industry trends.

• Pursue relevant education and certifications in CCTV technology

• Seek internships or entry-level positions at security companies or CCTV installation firms

• Stay updated on industry trends and advancements in CCTV technology

• Attend workshops, seminars, and conferences related to CCTV field

• Practic...read more

DVR records analog camera footage, while NVR records IP camera footage.

• DVR stands for Digital Video Recorder and records footage from analog cameras.

• NVR stands for Network Video Recorder and records footage from IP cameras.

• DVR uses coaxial cables to connect to cameras, while NVR uses Ethernet cables.

• NVR systems are more flexible and scalable compared to DVR systems.

• NVR systems can also support advanced features like motion detection and remote viewing.

• Example: A DVR system wo...read more

NVR stands for Network Video Recorder. It is a device used in CCTV systems to record and store video footage from IP cameras.

• NVR is a digital video recorder that uses a network connection to receive video streams from IP cameras.

• It is commonly used in CCTV systems for surveillance and security purposes.

• NVRs can support multiple cameras and offer features like remote access, motion detection, and video analytics.

• They store video footage on hard drives or network-attached stora...read more

DVR stands for Digital Video Recorder. It is a device that records and stores video footage from CCTV cameras.

• DVR is a digital device used for video surveillance.

• It records and stores video footage from CCTV cameras.

• DVRs can be standalone devices or built into a computer system.

• They typically have multiple channels to connect multiple cameras.

• DVRs offer various features like motion detection, remote viewing, and playback.

• They use hard drives or network-attached storage (NAS) ...read more

IP camera stands for Internet Protocol camera.

• IP camera is a type of digital video camera that sends and receives data via a computer network and the internet.

• It uses the Internet Protocol to transmit video and audio signals over a network.

• IP cameras can be wired or wireless and are commonly used for surveillance and security purposes.

• They can be accessed remotely from anywhere with an internet connection.

• Examples of IP camera brands include Hikvision, Axis Communications, an...read more