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1. When all data bits are sent at the same time, we are sending what type of data?

a) Digital
b) Serial
c) Parallel
d) None of the above

2. What are the steps of troubleshooting in correct order?

a) Visual inspection, Check power supply, Check inputs & outputs
b) Check power supply, Visual inspection, Check inputs & outputs
c) Visual inspection, Check inputs & outputs, Check power supply
d) None of the above

3. Who or what acts as the controller or "boss" in a multidrop network?

a) The first terminal on the network
b) The system administrator
c) The host computer
d) None of the above

4. What is one disadvantage of serial data over parallel data?

a) The hardware to generate serial data is very expensive.
b) Serial data is much more prone to transmission errors than parallel.
c) The transmission speed of serial data is slower.
d) None of these

5. Which of these best describes serial data?

a) All bits are sent at the same time.
b) One bit is sent at a time.
c) The data represented in analog form.
d) None of the above

6. Parallel data is best described as:

a) All bits are sent at the same time.
b) One bit is sent at a time.
c) The data represented in analog form.
d) None of the above

7. When a host wants to check to see if a terminal (slave) unit on a multidrop network has anything to say, what does it do to the terminal?

a) It stops all processing and waits for the terminal to send a message.
b) It transmits a poll message with the terminal's address.
c) It continues processing; the terminal will interrupt it when ready.
d) None of the above

8. Which of these is a method of impressing information onto a carrier wave?

a) Amplitude modulation (AM)
b) Frequency modulation (FM)
c) Phase modulation (PM)
d) All of the above
e) None of the above

9. The rate at which changes are made to an analog carrier wave is called the _______?

a) BPS
b) CPS
c) BAUD
d) None of the above

10. A modulator has an input data rate of 2400 BPS and encodes three bits per transition. Under these conditions, it uses up 1000 Hz of bandwidth. What will happen to the bandwidth if the data rate is reduced to 1200 BPS (and everything else stays the same)?

a) The bandwidth will remain exactly the same
b) The bandwidth will double
c) The bandwidth will become 750 Hz
d) None of the above

11. Which of the below factors limits the number of bits per transition in practical communication systems?

a) Channel power gain
b) Channel bandwidth
c) Channel S/N ratio
d) None of the above

12. A system transmits data at 19.2 KBPS, and has a signalling rate of 4800 BAUD. How many bits does it encode per transition?

a) 2
b) 3
c) 4
d) None of the above

13. What is meant by the terms "mark" and "space?"

a) Off and On conditions
b) Logic 1 and Logic 0 conditions
c) Ready or Not Ready conditions
d) None of these

14. If a certain modulator produces a change in the carrier every 1 mS, what is the resulting signalling rate?

a) 500 BAUD
b) 1000 BAUD
c) 2000 BAUD
d) None of the above

15. Which modulation method below changes the frequency of the carrier in order to represent the data?

a) FSK
b) ASK
c) PSK
d) None of these

16. In FSK, what property of the carrier is changed in order to represent the data?

a) Amplitude
b) Phase
c) Frequency
d) None of these

17. The data rate into a modulator is 1200 BPS, and its constellation is shown above. What will the signalling rate be?

a) 600 BAUD
b) 300 BAUD
c) 150 BAUD
d) None of these

18. A certain system has 8 modulation states and has an input data rate of 2400 BPS. What will the resulting signalling rate be?

a) 1200 BAUD
b) 2400 BAUD
c) 800 BAUD
d) None of the above

19. What two factors determine the information carrying capacity of a communications channel?

a) Bandwidth and power gain
b) S/N ratio and bandwidth
c) Power gain and S/N ratio
d) None of the above

20. How many bits are encoded per transition in the figure above?

a) 1
b) 2
c) 3
d) None of the above

21. In the above figure, 8 data bits, 1 stop bit, and a parity bit are being sent. What type of parity is in use?

a) Odd
b) Even
c) Can't tell from information given

22. Given that the parameters are 8,N,1 above, what hex data value is being sent?

a) $F3 (0xF3)
b) $A5 (0xA5)
c) $AF (0xAF)
d) None of the above

23. When a clock is sent with data, it is called ______ data.

a) Asynchronous
b) Synchronous
c) Digital
d) None of the above

24. What type of data is sent without a clock signal?

a) Asynchronous
b) Synchronous
c) Analog
d) None of the above

25. In the figure above, the parameters are 8,N,1 and the bit time is 1 mS. How many characters can be sent per second?

a) 125
b) 111
c) 100
d) None of the above

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