1. An example of digital, rather than analog, communication is?
a) DDD
b) DDS
c) WATS
d) DDT

2. A remote batch-processing operation in which data is solwly input to a central computer would require?
a) telegraphp line
b) simplex lines
c) mixed bad channel
d) all of above

3. Communication circuits that transmit data in both directions but not at the same time are operating in?
a) a simplex mode
b) a half duplex mode
c) a full duplex mode
d) an asynchronous mode

4. In communication satellite, multiple repeaters are known as?
a) detector
b) modulator
c) stations
d) transponders

5. Data communications monitors available on the software marked include?
a) ENVIRON/1
b) TOTAL
c) BPL
d) Telnet

6. An example of an analog communication method is?
a) laser beam
b) microwave
c) voice grade telephone line
d) all of the above

7. Which of the following types of channels moves data relatively slowly?
a) wide band channel
b) voice band channel
c) narrow band channel
d) simplex lines

8. Most data communications involving telegraph lines use?
a) simplex lines
b) wideband channel
c) narrow band channel
d) dialed service

9. How much power (roughly) a light emitting diode can couple into an optical fiber?
a) 100 microwatts
b) 440 microwatts
c) 100 picowatts
d) 10 milliwatts

10.The synchronous modems are more costly than the asynchronous modems because?
a) they produce large volume of data
b) they contain clock recovery circuits
c) they transmit the data with stop and start bits
d) they operate with a larger bandwidth
e) none of above