1. A “barrel” is a type of
a. transmission format.
b. BNC to BNC adaptor.
c. sine wave.
d. connector used to terminate a coax cable.
2. In order to have a video signal travel in a uniform path the cable must be properly terminated
a. because of resistance on the length of the cable.
b. because of the impedence characteristic of the cable.
c. because of power loss along the length of the cable.
d. only when the cable exceeds 1000 meters.
3. For long cable runs over 1,500 feet, the best cable to use is
d. Any of the above
4. For short cable runs, under 500 feet, aluminum braid cable is acceptable because of its lower cost.
5. To convert a video signal to travel over twisted-pair cable the installer must add a
d. IP address.
6. Video signals are most difficult to transmit over the Internet because of the large use of
7. Only IP and not analog camera signals can be transmitted over the Internet.
8. Video recorders that capture images at 30 frames per second would be considered _____________ recorders.
9. 1024KB is equivalent to
10. The larger the pixel size of an image, the better the quality.
11. The field of view of a scene is largest with which lens size?
12. The standard angle of view for a 2/3-inch-image format camera
13. The rule of thumb for the installation and bending of coax cable is
a. 5 times the diameter
of the cable.
b. 10 times the diameter
of the cable.
c. 5 times the radius of the cable.
d. no bend greater than
14. The BNC connector stands for
a. British National Connector.
c. Boyonet National Connector.
d. Bayonet Nickel Connector.
15. Twister pair transmission
a. is also known as a balun.
b. is not permitted.
c. is also known as Ethernet connectivity.
d. is also known as balanced
5-Minute Tech Quiz Answers
4. c — Aluminum is best used in master antenna systems.
7. b — Manufacturers have ways to transmit both types.
9. b — One megabyte.
11. c — The larger the lens, the smaller the field of view.
12. a — Thirty-degree horizontal field of view is considered standard.
14. b — Named for the designers.
What’s Wrong With This?
A technician installed eight cameras, a digital video recorder (DVR) with a 30-frames-per-second
recording rate and a monitor for a customer who wanted real-time recording on each camera. Upon playback, the customer complained that the picture was jumpy and appeared more like time lapse than real time. What did the technician do wrong?
Answer to: What's Wrong With This?
The alarm technician used a DVR that boasted 30-frames-per-second recording. However, because he used eight cameras the recorder only recorded each camera at less than four frames per second. Wally needed to use a DVR that could record at a combined 240 frames per second or better (30x8=240).