Practice Exam

Question 1

What is the difference between RS-232 and RS422 serial connections?

Answer 1

• RS-232 only allows for one transmitter and one reciever on each line. Full Duplex. Ships standard on most windows desktops.
• RS422 Faster (up to 10MBits/s. One Transmitter can connect to a bus of up to 10 receivers. Can transmit further. Standard on Apple Computers.

Question 2

What is the minimum number of wires needed to connect bidirectional RS-232?

Answer 2

3

Question 3

As you double distance how does it effect sound and brightness?

Answer 3

Sound will be 6db less.

Brighness will be 75% less

Question 4

Sound Levels should be how much above ambient room noise in a sound system?

Answer 4

25 db

Question 5

What is an advantage of a horn loudspeaker over cone?

Answer 5

More efficient: 10 times (10 db) more sound than a cone speaker.

Question 6

What is the disadvantage for a horn loudspeaker?

Answer 6

Frequency response is uneven. Bad bass response.

Question 7

What is a volt?

Answer 7

A unit for electromotive force. The inclination of a system to allow electric current to flow.

Question 8

What is the standard home voltage in the US?

Answer 8

120V

Question 9

What is the standard home voltage in Europe/Asia?

Answer 9

230V

Question 10

What is YP(B)P(R)?

Answer 10

A way of doing componant video. Y=luma & sync, P(B) = Difference between blue and Luma, P(R) = Difference between red and luma.

Question 11

What is gain in video?

Answer 11

On a CCD camera it’s how many electrons get converted into digital. Maximises dynamic range from each sensor.

Question 12

What is a watt?

Answer 12

Measure of Power - rate that envergy is consumed or produces. 1 wall = 1 joule/ second.

Question 13

What is an amp?

Answer 13

A unit for electric current. The amount of electrons passing point in a given time. 1 amp - a coulomb/ second.

Question 14

What are the differences between Composite, S-video, Component?

Answer 14

Composite: 1 channel (Fine. Low pass filter on luminence)
S-Video : 2 channels (Better)
Component: 3-5 channels (Best)

Question 15

What connector is used for S-Video?

Answer 15

4-pin. 2 signal pins and 2 grounds.

Question 16

What are examples of composite video?

Answer 16

NTSC(Americas), PASL (Europe), Secam (Africa, Russia)

Question 17

What is component video?

Answer 17

Anolog video transmission. Doesn’t carry audio.

Question 18

What are the different ways sync can be sent in component video?

Answer 18

Seperate (Red, Green, Blue, Horiz, Vert Sync). Composite Sync (Red, Green, Blue, Sync).

Question 19

What is chrominance?

Answer 19

A combination of hue and saturation.

Question 20

What is S-video?

Answer 20

Analog video transmission
Standard Def
2 channels; Y(Luma which is luminance and sync)) and C (Chroma) Doesn’t carry audio.

Question 21

Vectorscopes show…

Answer 21

Chroma Saturation (Color intensity).

Question 22

What is V-Sync?

Answer 22

For computer monitors. Makes the computer wait until the monitor has finished drawing an image before moving on to the next.

Question 23

Frames per second can’t be larger than what to avoid sync issues?

Answer 23

Frames per second can’t be larger than your monitor refresh rate (Usually between 60-90)

Question 24

What is composite video?

Answer 24

Analog video transmission.
Over One Channel.
No Audio.

Question 25

What is the aspect ratio of HDTV?

Answer 25

1.78:1

Question 26

What is the resolution of SXGA

Answer 26

1280 x 1024

Question 27

What two Resolutions count as HDTV?

Answer 27

1920 x 1080(p or i, 1280 x 720p

Question 28

Is HDTV transmitted analog of digitally?

Answer 28

Analog. Uses compression.