Introduction To Internet Of Things Week 3 NPTEL Assignment Answers 2025

NPTEL Introduction To Internet Of Things Week 3 Assignment Answers 2024

1. State whether the following statement is true or false.

Statement: There is no network layer in Wired HART

Options:
A. True
B. False

✅ Answer: A
📝 Explanation: Wired HART does not have a dedicated network layer as it primarily operates using a simple master-slave communication protocol.

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2. HART operates only in ____________ GHz ISM band.

Options:
A. 2.4
B. 4.8
C. 4.9
D. 4.4

✅ Answer: A
📝 Explanation: WirelessHART operates exclusively in the globally available 2.4 GHz ISM (Industrial, Scientific, and Medical) band.

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3. Super-frames in HART consist of grouped ___________ wide timeslots.

Options:
A. 10ms
B. 20ms
C. 55ms
D. None of these

✅ Answer: a
📝 Explanation: Each timeslot in a WirelessHART superframe is typically 10 milliseconds in duration.

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4. The process of identifying channels consistently affected by interference and removing them from use is known as ______________

Options:
A. Channel hopping
B. Channel aggregating
C. Frequency aggregating
D. Channel blacklisting

✅ Answer: d
📝 Explanation: Channel blacklisting is the method of removing frequently interfered channels from the communication pool in WirelessHART.

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5. State whether the following statement is true or false.

Statement: Each node is supervised by the application manager and it guides them on when and where to send packets.

Options:
A. True
B. False

✅ Answer: b
📝 Explanation: In WirelessHART, the Network Manager, not the Application Manager, is responsible for managing node communication.

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6. FeliCa is commonly found in which country?

Options:
A. Japan
B. India
C. USA
D. None of these

✅ Answer: a
📝 Explanation: FeliCa is a contactless RFID smart card system primarily used in Japan for electronic payments and transit systems.

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7. State whether the following statement is true or false.

Statement: NFC tags found in supermarket products are examples of passive NFC.

Options:
A. True
B. False

✅ Answer: a
📝 Explanation: Passive NFC tags do not have their own power source and rely on active devices to read them—common in supermarket applications.

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8. Active NFC devices are able to ______________?

Options:
A. Transmit information
B. Collect information
C. Both (a) and (b)
D. None of these

✅ Answer: c
📝 Explanation: Active NFC devices can both send and receive data, unlike passive NFC tags which only respond.

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9. _______________ in NFC emits a small electric current which creates a magnetic field that in turn bridges the physical space between the devices.

Options:
A. Reader
B. Writer
C. Destroyer
D. None of these

✅ Answer: a
📝 Explanation: An NFC Reader emits an electromagnetic field to power and communicate with passive NFC tags.

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10. Bluetooth technology is based on:

Options:
A. WiFi
B. LoRa
C. Ad-hoc technology
D. None of these

✅ Answer: c
📝 Explanation: Bluetooth is a short-range communication protocol based on Ad-hoc networking principles.

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11. Bluetooth technology operates in the unlicensed industrial, scientific and medical (ISM) band at ____________ to ____________ GHz.

Options:
A. 3.2, 5.6
B. 2.4, 2.485
C. 5.0, 5.89
D. None of these

✅ Answer: b
📝 Explanation: Bluetooth operates in the 2.4 GHz to 2.485 GHz ISM band.

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12. Z-wave operates at ____________ MHz in the US and ____________ MHz in Europe.

Options:
A. 1008, 989
B. 908.42, 868.42
C. 767.56, 855.28
D. None of these

✅ Answer: b
📝 Explanation: Z-Wave operates at 908.42 MHz in the US and 868.42 MHz in Europe.

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13. State whether the following statement is true or false.

Statement: Sensor nodes have limited battery life.

Options:
A. True
B. False

✅ Answer: a
📝 Explanation: Sensor nodes in wireless sensor networks typically operate on batteries and have limited energy resources.

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14. State whether the following statement is true or false.

Statement: The Link Manager Protocol in Bluetooth manages the establishment, authentication, link configuration.

Options:
A. True
B. False

✅ Answer: a
📝 Explanation: The Link Manager Protocol (LMP) handles the setup and management of connections in Bluetooth, including authentication and link configuration.

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15. Zigbee commonly uses _____________ data rate.

Options:
A. 250 kbps
B. 250 Mbps
C. 260 kbps
D. 260 Mbps

✅ Answer: a
📝 Explanation: Zigbee supports a maximum data rate of 250 kbps, which is sufficient for low-power, low-data rate applications like home automation.