# 05 - Baud rate and Bit rate

1. Baud rate is the rate at which __________________________in the communication medium.

the parallel or serial cables can transfer voltage

the signal changes (per second)

a single bit is transferred

voltage rises or falls

2. The unit of measurement used for baud rate is called a baud!

FALSE

TRUE

3. 3 kBd would mean ____________________________________.

3000 signal changes per bit sent through the transmission medium

3 signal changes per bit

3 signal changes per millisecond

3000 signal changes per second

4. Baud rate is essentially the exact same thing as Bit rate, but the terms are used interchangeably.

TRUE

FALSE

5. One signal change is always exactly the same thing as sending one single bit (which is what makes Baud rate and bit rate the same, in essence)

FALSE

TRUE

6. It is possible for one signal change to be cleverly manipulated to represent more than one bit.

FALSE

TRUE

7. If we take a voltage of a wire to determine the bit pattern we could use different voltages to signify more than one bit.

FALSE

TRUE

8. Have a look at the table below. What statement is most accurate. If we take a voltage of wire to determine the bit pattern we could use different voltages to signify more than one bit. E.g. we could detect between 0 and 7.5 volts to convey more than one bit at a time

The table demonstrates clearly that is is never possible to use different voltages to signify more than one bit

If we take a voltage of wire to determine the bit rate, then a single voltage could be used to identify a single bit

None of these answers are valid

9. Bit rate is the number of bits that can be ___________________________________________

transmitted for every millisecond of bandwidth used

transmitted per millisecond

transmitted per second

transmitted per baud rate bit

10. The units of measurement used for bit rate are:

Gbps

All of these answers are valid

Mbps

Kbps

11. 5600 bps (bits per second) means that:

5600 bits of data can be transferred per byte

5600 bits of data can be transferred per second

5600 bytes of data can be transferred per second

5600 bits of data can be transferred per millisecond

12. The formula for bit rate is:

baud rate x bits per baud

baud rate x 2 / bit rate

bit rate x 2

bit rate / baud rate x 2

13. Bandwidth is also measured in bits per second and is considered the useful bit rate.

FALSE

TRUE

14. Bit rate can be _______ than baud rate if more than one bit is encoded in each signal change

tidier

lower

more expensive

higher

15. In a particular communications system, eight different voltage levels are used to encode the value of groups of bits. Each voltage level encodes the value of one group of bits
```Given that eight different voltage levels are used,
how many bits can be in a group that is encoded by a
voltage level?```

4

3

2

1

16. Which of the following defines baud rate?

One baud is the number signal/voltage changes per second

rate at which signals are sent

rate at which voltage changes

All of the answers listed are valid

17. Number of bits per second / bits per unit of time =

baud rate

serial rate

bit rate

bandwidth time

18. The bit rate can also be accurately described as the rate at which signals are sent.

TRUE

FALSE

19. What do the statements in the following excerpt suggest?
```A signal can contain one or more bits;
Bit rate can be higher than baud rate;
Bit rate = baud rate * number of bits per signal change;;```

… that the baud rate and the bit rate of a communication channel may be different

that the baud rate and the bit rate of a communication channel will always be the same

that the baud rate is always inversely proportiate to the bit rate

that the baud rate is always equal to the bit rate

20. It is not possible for a signal to contain one or more bits

TRUE

FALSE