Automatic Control Lab 1: Open Loop Control
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Questions and Answers

What is the primary objective of the temperature control system in the PT 326 Process Trainer?

  • To maintain the temperature of the air at a desired level (correct)
  • To regulate the airflow rate
  • To enhance the efficiency of the centrifugal blower
  • To maintain the air pressure at a desired level

    • What is the role of the centrifugal blower in the PT 326 Process Trainer?

  • To regulate the electrical power supply
  • To heat the air
  • To cool the air
  • To draw air from the atmosphere (correct)

    • How is temperature control achieved in the PT 326 Process Trainer?

  • By controlling the duct's outlet
  • By adjusting the heater grid's position
  • By varying the airflow rate
  • By varying the electrical power supplied to the heater grid (correct)

    • What is the purpose of the duct in the PT 326 Process Trainer?

    <p>To release the air into the atmosphere</p> Signup and view all the answers

    What type of industrial situation does the PT 326 Process Trainer model?

    <p>A system with temperature control in the presence of transport delays and transfer lags</p> Signup and view all the answers

    What is the name of the device that is used to heat the air in the PT 326 Process Trainer?

    <p>Heater Grid</p> Signup and view all the answers

    Where can the temperature sensor be placed along the duct?

    <p>At any of the three positions P1, P2, and P3</p> Signup and view all the answers

    What is the function of the knob labeled 'proportional band'?

    <p>To adjust the gain factor</p> Signup and view all the answers

    What is the purpose of the bridge circuit?

    <p>To convert the resistance variation to a voltage variation</p> Signup and view all the answers

    What is available at terminal B?

    <p>The difference between the reference input and the feedback signal</p> Signup and view all the answers

    What is the purpose of the switch marked 'internal'?

    <p>To throw an additional step change in the set value</p> Signup and view all the answers

    What is the relationship between the proportional band and the gain factor?

    <p>A proportional band of PB % corresponds to a gain factor of 100/PB</p> Signup and view all the answers

    What does the heat capacity 'C' represent in the equation 𝑞𝑎 = 𝐶 𝑑𝑇 𝑑𝑡?

    <p>The heat capacity of the air occupying the volume V</p> Signup and view all the answers

    What is the assumption made regarding the temperature rise ∆𝑇 in the derivation of equation (3)?

    <p>The temperature rise ∆𝑇 is small</p> Signup and view all the answers

    What does the constant 'R' represent in equation (3)?

    <p>The thermal resistance of the system</p> Signup and view all the answers

    Where can the step input voltage of a certain fixed magnitude be observed?

    <p>Terminal marked 'B'</p> Signup and view all the answers

    What is the relationship between the heater heat supply rate 'q' and the heater input voltage 'Vi'?

    <p>q is directly proportional to Vi</p> Signup and view all the answers

    What does 'τ' represent in equation (5)?

    <p>The time constant of the system</p> Signup and view all the answers

    What is the purpose of observing both signals on the oscilloscope?

    <p>To determine the open-loop transfer function.</p> Signup and view all the answers

    What is the task in Section 3 of the lab assignment?

    <p>To obtain the average values for Process Gain, Time Constant, and Time Delay.</p> Signup and view all the answers

    What is the relationship between the temperature sensor output voltage 'Vo' and the increase in temperature ∆𝑇?

    <p>Vo is directly proportional to ∆𝑇</p> Signup and view all the answers

    What is the task in the Bonus lab assignment?

    <p>To change the Position of the temperature sensor to Locations P1 and P3.</p> Signup and view all the answers

    What is the question being asked in the lab assignment related to the time constant?

    <p>What is the Percentage value at which we determine the Time Constant?</p> Signup and view all the answers

    What is the primary function of the switch S in the process trainer?

    <p>To select between continuous and two-step control modes</p> Signup and view all the answers

    What is the physical principle governing the behavior of the thermal process in the PT326 apparatus?

    <p>The balance of heat energy</p> Signup and view all the answers

    What is the effect of the accumulation of heat in the volume V?

    <p>The temperature of the air in V rises</p> Signup and view all the answers

    What is the purpose of the PT326 Process Trainer Manual?

    <p>To provide more information about the system, including General Description, Specifications, Installation, and Operation</p> Signup and view all the answers

    What is the term for the rate at which heat is lost from the volume V to the surroundings?

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

    What is the rate at which heat is supplied by the heater?

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

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