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2nd year > CCTV Review > Flashcards

CCTV Review Flashcards

1
Q

Analog cameras cannot be used on a DVR True or False

A

False

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2
Q

The video standard for Canada is….

a. PAL
b. NTSC
c. NTSC-Canada
d. S-Video

A

b. NTSC

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3
Q

Which camera is better suited for low light conditions?

a. CCD
b. CMOS
c. DSP
d. FFL

A

a. CCD

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4
Q

What is the focal length of the human eye?

a. 7mm
b. 10mm
c. 13mm
d. 17mm

A

d. 17mm

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5
Q

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

A

Raster and Progressive

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6
Q

What are the two types of light sources?

A

Natural and Artificial

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7
Q

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

A

FFL

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8
Q

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

A

lens, monitor, camera, transmission

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9
Q

What is the major reason for video surveillance systems?

A

Protection of people and property (assets)

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10
Q

What is the cause of video hum?

A

grounding differences

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11
Q

What is the purpose of the camera’s sensor?

A

to transmit optical light to electrical signal

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12
Q

How many fields are there in one frame of video?

A

two

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13
Q

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

A

525

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14
Q

Define the five basic switcher types:

A

Homing, Bridging, Looping, Alarming, Manual

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15
Q

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

A

A television has tuners; a monitor does not.

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16
Q

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

A

Never

17
Q

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

A

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

18
Q

Define the following multiplexers:

a. Simplex
b. Duplex
c. Triplex

A

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

19
Q

What determines the light gathering ability of the lens?

A

Diameter of the optics

20
Q

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

A

LCD, LED, Plasma

21
Q

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

A

Red, blue and green

22
Q

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

A

Quad splitter

23
Q

How is a DVR different from an NVR?

A

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

24
Q

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

A

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

25
Q

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

A

Use monochrome at night

26
Q

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

A

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
Q

What lens type is most like the human eye?

A

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
Q

Define one FtCd of illumination.

A

Amount of light viewed from one candle at one foot

29
Q

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

A

No - the picture would be smaller than the sensor

30
Q

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

A

Below .1075 lux

31
Q

Define a virtual matrix switch

A

A router for cameras and monitors - computer based

32
Q

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

A

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

33
Q

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

A

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
Q

The sensitivity of a camera is measured in what?

A

lux

35
Q

What purpose do transmitters and receivers serve?

A

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

2nd year (46 decks)

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