IoT Actuators Quiz
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Questions and Answers

What is the role of actuators in an IoT system?

  • They provide input to the system
  • They perform direct actions upon the physical world (correct)
  • They control the algorithms in the system
  • They manage the communication within the system

How are digital actuators usually managed?

  • By producing continuous signals
  • By controlling the speed of a motor
  • By converting analog signals
  • By writing values to actuator output registers (correct)

What is the purpose of a digital-to-analog (DAC) converter circuitry in an IoT system?

  • To convert analog values to digital signals
  • To produce continuous signals
  • To implement control actions
  • To convert digital values into corresponding analog output signals (correct)

How do analog actuators typically produce signals in an IoT system?

<p>By converting digital values to analog signals (D)</p> Signup and view all the answers

What role does pulse-width modulation (PWM) play in digital output actuation?

<p>It provides a series of control pulses of variable duration (A)</p> Signup and view all the answers

In what way can actuators generate timed control pulses individually or in series?

<p>By having an output signal with programmatically controlled on and off states (D)</p> Signup and view all the answers

What type of outputs do integrated sensors usually produce?

<p>Digitized outputs communicated via wired serial buses (D)</p> Signup and view all the answers

What components are required for stand-alone sensor assemblies using wireless communication?

<p>Radios, modems, and communication software (A)</p> Signup and view all the answers

What do raw transducer outputs typically come in the form of?

<p>Voltage or current signals that vary in proportion to the stimulus (C)</p> Signup and view all the answers

What is often needed for analog signals to be read programmatically by the receiving entity?

<p>Analog-to-digital converter (ADC) circuit (B)</p> Signup and view all the answers

What are smart sensors designed to support as a design choice?

<p>Standard protocols and connection to any suitable level of hierarchy in IoT systems (D)</p> Signup and view all the answers

What is used to convert digitized values to engineering units for use by the rest of the IoT system?

<p>Post processing (D)</p> Signup and view all the answers

What is used to reduce the number of signal traces especially for natively analog measurements?

<p>Wired serial buses such as I2C or SPI (A)</p> Signup and view all the answers

What type of connection do some sensors, such as smart home thermostats, have the additional ability to connect to?

<p>'Internet connection via home Wi-Fi connection' (D)</p> Signup and view all the answers

What is the primary function of a sensor in an IoT system?

<p>To convert physical stimuli to a processable output (C)</p> Signup and view all the answers

In what formats do sensor-produced signals come?

<p>Analog and digital (B)</p> Signup and view all the answers

What is the role of actuators in an IoT system?

<p>To generate control pulses (D)</p> Signup and view all the answers

What type of inputs should be included in the definition of IoT sensing?

<p>Human inputs and observations on the physical world (B)</p> Signup and view all the answers

What do sensors and devices containing them vary widely in terms of?

<p>Their functions, processing power, and connectivity (C)</p> Signup and view all the answers

Which component is required for stand-alone sensor assemblies using wireless communication?

<p>Bluetooth connectivity chip (D)</p> Signup and view all the answers

What type of error is produced when digitizing analog values into a limited range of digital numbers?

<p>Quantization error (C)</p> Signup and view all the answers

What is the role of an analog-to-digital converter (ADC) circuit in the sensor data processing?

<p>To sample and convert the input signal into its corresponding digital value (A)</p> Signup and view all the answers

What determines the accuracy of the result in the digitization of analog values?

<p>ADC resolution defined by its number of bits (B)</p> Signup and view all the answers

What does the sampling frequency determine in the acquisition of fast-changing input signals?

<p>The rate of taking measurements (A)</p> Signup and view all the answers

What do raw transducer outputs typically come in the form of?

<p>Voltage or current signals (A)</p> Signup and view all the answers

What role does signal conditioning and amplification circuitry play in sensor data processing?

<p>Matching the range of signals to their terminating points and interfaces (D)</p> Signup and view all the answers

What happens when continuous analog values are represented by a limited range of digital numbers?

<p>Quantization error is produced (A)</p> Signup and view all the answers

What is necessary for analog signals to be brought to the appropriate system interface point for further processing?

<p>Signal conditioning and amplification circuitry (D)</p> Signup and view all the answers

What determines how many bits in the digital output code represent useful information in an ADC?

<p>Internal circuitry and noise from external sources connected to the ADC input (B)</p> Signup and view all the answers

What is needed for digital signal inputs to be read programmatically by the receiving entity?

<p>Conversion to 0 or 1 value in the corresponding input register (A)</p> Signup and view all the answers

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