Quiz 1 - Online quiz in week 6 PDF

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Online quiz in week 6...

Description

10/26/2019

Quiz 1 (On Weeks 1-3): Wireless Sensor Networks and the Internet of Things (1950)

Due 19 Aug at 23:59

Points 20

Questions 13

Available 11 Aug at 9:00 - 19 Aug at 23:59 9 days

Time limit 60 Minutes

Allowed attempts 2

Instructions 1- Please read the questions carefully 2- The quiz will contribute to 2.5% of your final grade 3- Questions are presented one at a time 4- A question is locked after answering 5- The quiz is open book 6- Correct answers will be released before the mid-term test. This quiz was locked 19 Aug at 23:59.

Attempt history

LATEST

Attempt

Time

Score

Attempt 1

44 minutes

12.67 out of 20

Score for this attempt: 12.67 out of 20 Submitted 18 Aug at 22:05 This attempt took 44 minutes.

Question 1

1 / 1 pts

NB-IoT technology is currently offered (or going to be offered) by the main mobile operators in Australia. This technology is not designed to operate in the ISM band Correct!

True

Question 2

https://rmit.instructure.com/courses/55849/quizzes/231002

1 / 1 pts

1/6

10/26/2019

Quiz 1 (On Weeks 1-3): Wireless Sensor Networks and the Internet of Things (1950)

The preamble in LoRa is used to synchronize the receiver with the received signal. Correct!

True

Question 3

1 / 1 pts

An IoT device can only upload the data to the network, it can not usually receive data.

Correct!

False

Question 4

1 / 1 pts

In license exempt (or License Free) IoT technologies, the performance of the network usually gets enhanced with time, as more and more devices are joining in.

Correct!

False

Question 5

1 / 1 pts

In LoRa modulation a lower spreading factor means higher bit rate (for the same bandwidth)

https://rmit.instructure.com/courses/55849/quizzes/231002

2/6

10/26/2019

Correct!

Quiz 1 (On Weeks 1-3): Wireless Sensor Networks and the Internet of Things (1950)

True

Question 6

1 / 1 pts

LoRaWAN gateways usually uses LoRa modulation for both access and backhaul links

Correct!

False

Question 7

1 / 1 pts

In LoRa modulation, a higher spreading factor will lead to a better coverage Correct!

True

Question 8

0 / 1 pts

Coding is added to an IoT communication system in order to reduce the bit error rate orrect answer You Answered

True False

https://rmit.instructure.com/courses/55849/quizzes/231002

3/6

10/26/2019

Quiz 1 (On Weeks 1-3): Wireless Sensor Networks and the Internet of Things (1950)

Question 9

0 / 2 pts

LoRa and LoRaWAN relation Correct!

LoRaWAN is the standard that uses LoRa modulation

You Answered The main aim is to have lower power wide range IoT connectivity for enabling long battery life

Question 10

2 / 2 pts

When selecting an IoT access systems, the following main consideration(s) should be taken into account Correct!

Energy consumption

Correct!

Data rate

Correct!

Interoperability and available standards

Correct!

Coverage capability

https://rmit.instructure.com/courses/55849/quizzes/231002

4/6

10/26/2019

Quiz 1 (On Weeks 1-3): Wireless Sensor Networks and the Internet of Things (1950)

0.67 / 2 pts

Question 11

Match the correct LoRaWAN device class to its attribute You Answered

Class A

Is good for applications th

Correct answer

The most efficient in terms of energy consumption

Correct!

Class B

You Answered

Class C

Allows the IoT-device to w

The most efcient in term

Correct answer

Is good for applications that require responsive control of actuators

Question 12

0 / 2 pts

In LoRa modulation, the symbol is represented by

orrect answer You Answered

The start frequency of the chirp Length of the chirp

Question 13 https://rmit.instructure.com/courses/55849/quizzes/231002

3 / 4 pts 5/6

10/26/2019

Quiz 1 (On Weeks 1-3): Wireless Sensor Networks and the Internet of Things (1950)

A LoRa IoT device is using data-rate configuration DR4, with Code Rate 4/5. Find the following. - The CR parameter in LoRa 1 - The payload bit rate rounded to an integer 12500

in bits

per seconds - How many bits are carried in each symbol 256 - The symbol time in microseconds 0.512 Note: Only put a numeric answer in the box Answer 1: Correct!

1 Answer 2:

Correct!

12500 Answer 3:

Correct!

256 Answer 4:

You Answered orrect answer

0.512 512

Quiz score: 12.67 out of 20

https://rmit.instructure.com/courses/55849/quizzes/231002

6/6...