Digital Signal and Programmable Logic Controllers Quiz
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Questions and Answers

What is the primary function of an ADC in electronics?

  • Convert digital signals into analog signals
  • Amplify digital signals
  • Filter noise from analog signals
  • Convert analog signals into digital signals (correct)

    • Which device converts a digital signal into an analog signal?

  • Microcontroller
  • PLC
  • ADC
  • DAC (correct)

    • In a control system, what role do output devices like relays and contactors play?

  • Filter noise from analog signals
  • Amplify digital signals
  • Control operating devices such as motors and pumps (correct)
  • Convert analog signals into digital signals

    • What type of signals are discrete signals in a control system?

    <p>Digital signals</p> Signup and view all the answers

    What is the function of input devices like switches and thermostats in a control system?

    <p>Sense specific conditions of a process or system</p> Signup and view all the answers

    Which component of a control system receives information and decides on a response?

    <p>Processor</p> Signup and view all the answers

    What is one of the advantages of PLCs that contributes to reducing expensive downtime?

    <p>Programs can be changed without any changes in hard-wiring.</p> Signup and view all the answers

    How do smart relays control an electrical circuit?

    <p>Via the network.</p> Signup and view all the answers

    What feature of PLCs makes them reliable in industrial environments with excessive heat and humidity?

    <p>STATIC electronic switching with no moving parts.</p> Signup and view all the answers

    How does the programmability of PLCs differ from traditional electromechanical relays?

    <p>Control programs in PLCs can be changed without rewiring.</p> Signup and view all the answers

    What aspect of PLC systems allows for easy troubleshooting and logical testing during operation?

    <p>Programmable ladder logic displaying device status and power flow.</p> Signup and view all the answers

    In what way do most PLC systems provide an advantage in terms of expandability?

    <p>Components can be easily added to the system due to modular design.</p> Signup and view all the answers

    What type of signals does a discrete input device sense or send?

    <p>Digital signals</p> Signup and view all the answers

    Which component of a PLC sends a discrete digital signal to the PLC?

    <p>Discrete Input Device</p> Signup and view all the answers

    What is one of the main purposes of a programmable logic controller (PLC) in an industrial setting?

    <p>To perform internal diagnostics and analysis</p> Signup and view all the answers

    Which characteristic is essential for a device to be considered a programmable logic controller (PLC)?

    <p>Ease of programming</p> Signup and view all the answers

    How do PLCs vary in terms of I/O points they can serve?

    <p>They can range from tens to thousands of I/O points</p> Signup and view all the answers

    What primarily influences the selection of a PLC according to the text?

    <p>The number of Inputs &amp; Output points it can serve</p> Signup and view all the answers

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