What metric is used to express a relative increase or decrease in signal strength?
Answer(s): C
Decibel (dB): A logarithmic unit expressing ratios of power or signal strength. It's used in RF contexts due to the wide range of signal levels encountered.Examples:dBm: Decibels relative to one milliwatt (power measurement). dBi: Decibels relative to an isotropic antenna (antenna gain).
Decibel: https://en.wikipedia.org/wiki/Decibel
As an RF signal propagates it becomes weaker at any given measurement point as it gets farther away from the transmitter.What concept is described?
Answer(s): B
Free Space Path Loss (FSPL): Describes how a radio signal weakens as it travels through open space, even without obstacles. It's caused by the signal spreading out, resulting in decreased power density at the receiver.Calculation: FSPL depends on distance and frequency.
Free Space Path Loss: https://en.wikipedia.org/wiki/Free-space_path_loss
You are implementing a smart office wireless solution for a small business. The business owner indicates that It is acceptable to use consumer-targeted wireless devices.What is a common negative attribute of consumer-targeted smart home or smart office devices?
Consumer Smart Devices Limitation: Many consumer-oriented smart devices are designed for simplicity and cost-effectiveness, leading to reliance on the crowded 2.4 GHz band.Consequences:High Interference: Increased potential for interference from Wi-Fi and other 2.4 GHz devices. Limited scalability: Performance and reliability may degrade in busy wireless environments.
What is most often used to track livestock on large farms and identify each animal Individually?
RFID for Livestock: Radio Frequency Identification (RFID) tags are the most widely used technology for livestock tracking and individual identification on large farms.Benefits:Unique ID: Each RFID tag has a unique code.Data Storage: Some tags store information about the animal.Durability: Tags withstand outdoor conditions.Automated Reading: Tags can be scanned quickly.
RFID (General): https://en.wikipedia.org/wiki/Radio-frequency_identification
What kind of PoE device can be used to power a non-PoE connected object assuming PoE power is provided on the Ethernet cable?
Answer(s): D
PoE Splitter: A PoE splitter separates power and data from a PoE-enabled Ethernet cable, allowing the powering of non-PoE devices.Other PoE Devices:PoE Injector: Adds power to non-PoE Ethernet cable.PoE Switch: Provides power directly through its ports.
What is a common characteristic of Industrial IoT (IIoT) devices that is not a characteristic of all IoT devices?
Answer(s): A
IIoT Environments: Industrial IoT (IIoT) often involves deployment in harsh environments (factories, plants, outdoor sites) with:Extreme temperaturesDust & VibrationsExposure to chemicals or moistureRuggedization: IIoT devices are designed to withstand these conditions, ensuring reliability and longevity.
IIoT: https://en.wikipedia.org/wiki/Industrial_Internet_of_things Rugged Devices: Articles on ruggedized electronics will emphasize their importance in industrial settings.
A Wi-Fi enabled weight scale is an example of what kind of health IoT device?
Health IoT Device Categories:Wearable: Devices worn on the body (smartwatches, fitness trackers). Non-wearable: Devices used without being worn (smart scales, connected medical equipment). Implantable: Surgically inserted devices (pacemakers, glucose monitors).
Health IoT: Resources on healthcare + IoT will illustrate device types.
In the simplified three-layer model for wireless IoT, what is the universal primary function of the Perception layer?
Perception Layer: The foundation of an IoT system, it consists of sensors and actuators that:Sense: Collect data about the environment or object being monitored. Actuate: Potentially make changes based on commands (e.g., a smart valve opening/closing). Transmit: Send gathered data to upper layers for processing.
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