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Flashcards in CCTV Review Deck (35):
1

Analog cameras cannot be used on a DVR True or False

False

2

The video standard for Canada is....
a. PAL
b. NTSC
c. NTSC-Canada
d. S-Video

b. NTSC

3

Which camera is better suited for low light conditions?
a. CCD
b. CMOS
c. DSP
d. FFL

a. CCD

4

What is the focal length of the human eye?
a. 7mm
b. 10mm
c. 13mm
d. 17mm

d. 17mm

5

What are the two scanning methods used in the camera and monitor video scanning process?

Raster and Progressive

6

What are the two types of light sources?

Natural and Artificial

7

What is the most common type of lens used in video security applications?

FFL

8

What are the four items required for a simple video system?

lens, monitor, camera, transmission

9

What is the major reason for video surveillance systems?

Protection of people and property (assets)

10

What is the cause of video hum?

grounding differences

11

What is the purpose of the camera's sensor?

to transmit optical light to electrical signal

12

How many fields are there in one frame of video?

two

13

How many lines per frame does the NTSC television format use?

525

14

Define the five basic switcher types:

Homing, Bridging, Looping, Alarming, Manual

15

What is the difference between a video monitor and a television?

A television has tuners; a monitor does not.

16

Should an aluminum foil-type coax be used for cctv?

Never

17

What are some advantages a DVR has versus an analog recorder?

Faster to review, better picture quality, more storage, password protection, less mati

18

Define the following multiplexers:
a. Simplex
b. Duplex
c. Triplex

a. Simplex: One at a time Record
b. Duplex: Two at a time Review
c. Triplex: Three at a time Live View

19

What determines the light gathering ability of the lens?

Diameter of the optics

20

What are the three most common types of flat panel monitors?

LCD, LED, Plasma

21

What are the colors used to generate an image on a CRT monitor?

Red, blue and green

22

What piece of equipment is used to display four cameras on a single monitor?

Quad splitter

23

How is a DVR different from an NVR?

DVR has limited capacity while the NVR (Network Remote Access) has a much larger capacity.

24

What is the difference between an analog matrix switch and a virtual matrix switch?

An analog matrix switch is when the components are switched by hand; the virtual is all on computer.

25

How does the day/night camera change to provide the best image for varying light conditions?

Use monochrome at night

26

What is the difference between a digital camera and an IP camera?

A digital camera is managed on a DVR and uses overcoax or UTP filter; the IP camera is managed over the network and on the Cat only)

27

What lens type is most like the human eye?

FFL - auto iris the answer depends on sensor size and viewfinder magnification, but the answer ends up being about 50mm for most full frame

28

Define one FtCd of illumination.

Amount of light viewed from one candle at one foot

29

Can you use a lens listed for use on a 1/4" sensor on a 1/2" sensor? Why or why not?

No - the picture would be smaller than the sensor

30

What lux level is considered to be a low light level?

Below .1075 lux

31

Define a virtual matrix switch

A router for cameras and monitors - computer based

32

What are some of the things that will affect the quality of a video image?

distance, wire methods, camera type, lens used, recording device, lighting

33

What is the difference between an analog camera and a digital camera?

An analog camera uses an electrical signal and film, while the digital camera converts image to data, which can be copied, shared, manipulated and stored, indefinitely, with zero image corruption.

34

The sensitivity of a camera is measured in what?

lux

35

What purpose do transmitters and receivers serve?

Transmitters balance the signal for transmission to an electrical signal.
Receivers unbalances the signal for display to a video signal.