Deck 14: Close Circuit Television Camera Systems and National Electrical Code Article 820

Question 1

What is the only drawback in using coax cable as the transmission link in a CCTV system?

A) Ground loops
B) Cost
C) Electrical properties are less than ideal
D) Attaching the connectors is time consuming

Answer 1

A

Question 2

A Vidicon camera should be used in environments where there is bright, consistent light .

Answer 2

True

Question 3

Coax cable is the most commonly used link in CCTV systems .

Answer 3

True

Question 4

When a designer is selecting a camera type, s/he should take into consideration _______.

A) lighting
B) the number of people entering and exiting an area
C) the vertical deflection speed of the beam on the monitor
D) the NTSC standards

Question 5

Which of the following is not a common connector for coax cable?

A) BNC
B) XLR
C) F-type
D) N-type

Question 6

A CCD camera can provide a full-resolution picture requiring less light than a tube camera

Question 7

Sensitivity refers to the minimum amount of light that the camera requires to produce a full video image .

Question 8

The amount of illumination produced by a standard candle at a distance of 1 foot is called _________.

A) Lumen
B) Exposure
C) Lumination
D) Lux

Question 9

What type of camera is a sensitive camera that is designed to operate in extreme, low-light conditions ?

A) Vidicon
B) SIT
C) Ultricon
D) Newvicon

Question 10

Viewing a recorded image from a digital video recorder, the picture will look jerky because frames have been left out.

Question 11

How can a format of the camera and the focal length of a lens be determined?

A) By using a simple formula
B) By placing the lens on the camera and looking at the projected image
C) By looking at the manufacturer's specifications
D) They cannot be determined

Question 12

If a camera has a 1/3-inch format , what should be the lens size to create a perfect picture?

A) 1/4"
B) 1/3"
C) 1/2"
D) 2/3"

Question 13

The measure of a camera's ability to distinguish between objects in close proximity to each other is called __________.

A) Resolution
B) Sensitivity
C) Imaging
D) Field of View

Question 14

A lens format does not have to match the format of the camera for a perfect image.

Question 15

The viewing format ratio of 4:3 is also known as "widescreen".

Question 16

Which transmission standard consists of 525 horizontal lines and 60 vertical lines of display ?

A) NTSB
B) SECAM
C) PAL
D) NTSC

Question 17

Which of the following is a common f-stop value?

A) 1.2
B) 2.8
C) 5.8
D) All the above

Question 18

A sold state camera should be used in a dimly lit parking lot or a dark room.

Question 19

A fixed focal lens is used is situations where lighting conditions can vary from full light to low light .

Question 20

According to the National Electrical Code, C oaxial cables entering buildings from underground, can be run in the same raceway as Class 1 conductors with not separation requirements .

Question 21

According to the National Electrical Code, when grounding coaxial cables associated with CCTV systems, as long as __________ no other ground is required.

A) The viewing monitor that the cable is attached to is grounded
B) The outer conductive shield on the cable is grounded
C) The camera that the coax is connected to is using a building ground
D) The grounding means used for all other communications systems is at a different potential

Question 22

A camera converts a visual image into a usable video signal that typically measures ________.

A) 1Vp-p
B) 6Vp-p
C) 12VDC
D) 24VDC

Question 23

Express the answer from question # 26 in lux .

Question 24

With each successive increment of the f-stop dial, for example, from 16 to 22, what happens to the amount of available light ?

Question 25

How much light (in footcandles) is available in a gravel parking lot on an overcast day?

Question 26

A camera needs to record a view that includes a window measuring 3 feet horizontally. The camera being used has a format of 1/3-inch (4.8 mm), and the FL of the lens is 12 mm. How far out from the door does the camera need to be to see a viewable picture on the monitor?

Question 27

When deciding on the best image resolution, a good rule of thumb is the higher the image resolution, _________.

A) The lower the number of scanning lines
B) The more pictures you can multiplex one monitor
C) The brighter the picture
D) The better the image

Question 28

According to the National Electrical Code, coaxial cable being used for distributed television, must be installed so ________.

A) They are in the same raceway as Class 1 conductors
B) They do not occupy the same raceway as Class 1 or Class 2 conductors
C) That there is no possibility of unnecessary contact with another system
D) That they maintain a separation of at least 2" from that of Class 1 conductors

Question 29

What is the aspect ratio for the new high-definition televisions?

Question 30

What is an advantage of using CAT5 cabling over coax as the transmission link in a CCTV system?

A) CAT5 is an easier cable to pull through raceways
B) Control signals cannot be sent over coax
C) A dditional cabling infrastructure does not need to be installed within the structure of a building
D) CAT5 is not susceptible to electrical interference of any kind