Quiz 2 - Online quiz in week 11 PDF

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Online quiz in week 11...

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10/26/2019

Quiz 2 (Up to Week 9): Wireless Sensor Networks and the Internet of Things (1950)

Due 8 Oct at 23:00

Points 20

Questions 10

Available 1 Oct at 9:00 - 8 Oct at 23:00 8 days

Time limit 90 Minutes

Allowed attempts 4

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- You are allowed to navigate between questions 5- The quiz is open book 6- Correct answers will be released before the final exam Good luck and all the best !!

This quiz was locked 8 Oct at 23:00.

Attempt history Attempt

Time

Score

KEPT

Attempt 1

39 minutes

16 out of 20

LATEST

Attempt 2

46 minutes

15 out of 20

Attempt 1

39 minutes

16 out of 20

Score for this attempt: 15 out of 20 Submitted 8 Oct at 22:50 This attempt took 46 minutes.

Question 1

1 / 1 pts

Latency is not an important issue in Industry 4.0, because most of the industrial robots are delay tolerant

Correct!

False

https://rmit.instructure.com/courses/55849/quizzes/231000

1/6

10/26/2019

Quiz 2 (Up to Week 9): Wireless Sensor Networks and the Internet of Things (1950)

Question 2

1 / 1 pts

Meshed IoT wireless technologies generally have longer battery life because it breaks communication links into smaller ones

Correct!

False

Question 3

1 / 1 pts

The receiver's sensitivity can be seen as the minimum signal power that is required for adequate packet reception. Correct!

True

Question 4

0 / 1 pts

Since hand-over is not supported in NB-IoT system, Cat-NB1 devices are not permitted to move from one cell to another You Answered

orrect answer

True

False

Question 5

1 / 1 pts

JSON data format can only be used for JavaScript applications https://rmit.instructure.com/courses/55849/quizzes/231000

2/6

10/26/2019

Correct!

Quiz 2 (Up to Week 9): Wireless Sensor Networks and the Internet of Things (1950)

False

Question 6

1 / 1 pts

It is not necessary for an IoT device to support the full stack of IP protocol, in fact, simpler communication/network protocols can reduce the energy consumption of these devices. Correct!

True

Question 7

1 / 3 pts

You have a remote NB-IoT device transmitting some packets to a far gateway. The transmission is suffering from a high packet loss. What possible solution(s) can be taken to remedy this (Select all that apply): orrect answer Increase the antenna gain of the eNB (by upgrading the antenna into a more directional one)

Correct! orrect answer

Increase the repetition rate of the uplink message Increase the transmit power of the IoT device

Question 8 https://rmit.instructure.com/courses/55849/quizzes/231000

3 / 3 pts

3/6

10/26/2019

Quiz 2 (Up to Week 9): Wireless Sensor Networks and the Internet of Things (1950)

Match the most suitable IoT connectivity class to the target application Correct!

Industry 4.0

Correct!

Battery-powered water meters

Correct!

Wireless IP Camera

Correct!

Mains-powered IoT sensor

Low-latency wireless conn

LPWAN

LTE or Wi-Fi if avilable

PoE Ethernet connection,

2 / 4 pts

Question 9

Suppose you have an IoT device with three modes of operation : - Transmitting: lasting for =60 ms for each message, and consuming 150 mA - Network synchronisation, lasting for 500 and repeating every 10 seconds, consumes 25 mA - Otherwise in a sleep mode, with current draw of 5 1- How many synchronisation cycles are performed in 24 hours 8640

(don't put the units)

2- What is the drawn electric charge (measured in mAh) within 24 hours for the synchronisation activities only 0.03

(format 0.0000 - don't

put the units) 3- What is the drawn electric charge (measured in mAh) required for sending 50 messages per day 0.1249

(format 0.0000 - don't put the

units) 4- What is the total drawn electric charge (measured in mAh) within the 24 hours 0.2749

https://rmit.instructure.com/courses/55849/quizzes/231000

(format 0.0000 - don't put the units)

4/6

10/26/2019

Quiz 2 (Up to Week 9): Wireless Sensor Networks and the Internet of Things (1950)

Answer 1: Correct!

8640 Answer 2:

Correct!

0.03

orrect answer

0.0300

orrect answer

0.030 Answer 3:

You Answered

0.1249

orrect answer

0.1250

orrect answer

0.125 Answer 4:

You Answered

0.2749

orrect answer

0.2750

orrect answer

0.275

Question 10

4 / 4 pts

Suppose you have a Cellular IoT system with the following parameters: - An eNB with EIRP power of 41 dBm. - The (RX) is an IoT device with effective bandwidth of BW = 180 kHz and requires a minimum SNR of 15 dB. It has a noise figure of F=6 dB and an antenna of 0 dBi - The total path-loss between the eNB and the IoT device is 150 dB Answer the following: 1- Whats is the received power at the IoT device (in dBm, do not put the https://rmit.instructure.com/courses/55849/quizzes/231000

5/6

10/26/2019

Quiz 2 (Up to Week 9): Wireless Sensor Networks and the Internet of Things (1950)

unit) -109 2- What is the noise power at the receiver assuming a noise bandwidth of 180 kHz and a thermal noise PSD -174 dBm/Hz (in dBm, format 0.00, do not put the unit) -115.45 3- What is the signal to noise ratio at the received (in dB, format 0.00, do not put the unit) 6.45 4- Is the link expected to work ? (y/n) n

Answer 1: Correct! orrect answer

-109 -109.00 Answer 2:

Correct!

-115.45

orrect answer

-115.4

orrect answer

-115 Answer 3:

Correct!

6.45

orrect answer

6.4

orrect answer

6 Answer 4:

Correct! orrect answer

n N

Quiz score: 15 out of 20

https://rmit.instructure.com/courses/55849/quizzes/231000

6/6...