01 - Serial and parallel transmission

 1. In _____ transmission, the binary signals representing the data are transmitted one after the other.





 2. In ______ tranmission, more than one series of data bits can be transmitted at the same time.





 3. Which of the following diagrams illustrate a serial half duplex connection?



  None of the diagrams illustrate this


 4. Parallel transmission can be achieved by __________________________________________________________________

  using just two cables that are embedded inside each other to make one large cable

  using several cables instead of just one single cable

  using a single parallel cable (called a SP cable)

  using a single cable instead of several cables

 5. Parallel tranmission is considered _________________ since there is a central clock that controls the timing of data sent on different wires.





 6. The three classes of serial transmission are:

  simplex, half duplex and duplex

  real, biased and solo-serial

  concurrent, current and parallel

  linear, binary and parallel

 7. Half duplex allows communication in only one direction. It requires only one channel.



 8. Duplex method allows communication in__________________________________________________________________

  a single direction, using a single channel

  both directions, but not at the same time, using a single channel

  one direction, at one time, but using two channels

  both directions, at the same time, using two channels permanently available

 9. In Half duplex there are two channels and the direction is switched after the completion of transmission in the other direction.



 10. Serial tranmission can operate either in synchronous mode with a mutual clock or asynchronous mode (no mutual clock)



 11. What are common examples of serial communication standards?

  Alpha, Beta, Theta cables

  USB, SATA, RS232

  None of the answers listed are valid

  Ethernet, WI-FI, Skype

 12. Modern serial connection standards such as ______________ are used to connect hard drives to motherboards and are very fast.





 13. USB stands for:

  universal serial bus

  united stereotyped bungle

  universal sata bus

  universal state bit

 14. Parallel communication is only suitable or practical over ______ distances due to increased cable cost.
Note: As the distance is increased, the voltages on each of the lines move slightly out of sync and this can hugely reduce reliability

  extremely large

  wide geographical



 15. In parallel tranmission, as the wires get longer, parallel transmission can suffer from what is known as:





 16. A common use of parallel communication used to be to:
Note: Due to the cost, serial communication links are replacing many of the parallel communication options

  connect two users across the globe via an application like skype

  connect peripherals, such as printers, to a PC

  connect devices wirelessly, e.g. a wireless mouse to a PC

  connect two devices across a WAN (via a router)

 17. A current and common use of parallel communication can be found on a PC motherboard. The _________ is a parallel system.

  SATA cable

  port cables

  skype socket

  PCI bus

 18. Which of the following diagrams illustrates a serial duplex connection?



  None of the diagrams illustrate this


 19. Which of the following diagrams illustrates a parallel half duplex connnection?


  None of the diagrams illustrate this



 20. Parallel transmission sends ________________________ while serial transmission only sends one bit at a time.

  many bits at the same time

  None of these options are correct

  several bits but only as a one off

  a single bit at a very high frequency

 21. Reasons why serial transmission may be preferred to parallel transmission include:
1. Parallel communication requires more wires and hardware
2. Parallel has a higher cost than serial
3. Parallel is more difficult to manage when setting up
4. Parallel is more difficult to repeat or switch
5. Parallel communication needs data to be synchronised across wires (risk of skew)
6. Greater change of errors in Parallel
7. Parallel has limiting factors - e.g. increased errors or reduced speed with cable length
8. Parallel communication carries the risk of cross-talk between wires
9. Parallel communication has a greater chance of errors as it uses fewer wires (less cross talk chance)

  1,2,3,7 and 9


  1,2,3, and 6

  All of the items on the list are valid, as they demonstrate that serial would have greater advantages over parallel

 22. If data is sent over a long distance, serial communication may be better because:

  bits transmitted simultaneously/together may arrive at different times

  data skew may occur if parallel communication is used

  All of the listed options are valid answers

  it eliminates the risk of desynchronisation (between data signals)

 23. Generally speaking, serial communication requires more cables or wires



 24. Parallel communication is typically best used only over short distanes (else data skew might occur)



 25. Hardware for serial communication is generally speaking, considered much more expensive to manufacture than parallel communication hardware.