Automatic Control Lab 1: Open Loop Control

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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?

To release the air into the atmosphere (D) Signup and view all the answers

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

A system with temperature control in the presence of transport delays and transfer lags (A) 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?

Heater Grid (D) Signup and view all the answers

Where can the temperature sensor be placed along the duct?

At any of the three positions P1, P2, and P3 (D) Signup and view all the answers

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

To adjust the gain factor (D) Signup and view all the answers

What is the purpose of the bridge circuit?

To convert the resistance variation to a voltage variation (A) Signup and view all the answers

What is available at terminal B?

The difference between the reference input and the feedback signal (B) Signup and view all the answers

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

To throw an additional step change in the set value (B) Signup and view all the answers

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

A proportional band of PB % corresponds to a gain factor of 100/PB (C) Signup and view all the answers

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

The heat capacity of the air occupying the volume V (C) Signup and view all the answers

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

The temperature rise ∆𝑇 is small (C) Signup and view all the answers

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

The thermal resistance of the system (C) Signup and view all the answers

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

Terminal marked 'B' (A) Signup and view all the answers

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

q is directly proportional to Vi (B) Signup and view all the answers

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

The time constant of the system (B) Signup and view all the answers

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

To determine the open-loop transfer function. (C) Signup and view all the answers

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

To obtain the average values for Process Gain, Time Constant, and Time Delay. (D) Signup and view all the answers

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

Vo is directly proportional to ∆𝑇 (B) Signup and view all the answers

What is the task in the Bonus lab assignment?

To change the Position of the temperature sensor to Locations P1 and P3. (C) Signup and view all the answers

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

What is the Percentage value at which we determine the Time Constant? (B) Signup and view all the answers

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

To select between continuous and two-step control modes (A) Signup and view all the answers

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

The balance of heat energy (A) Signup and view all the answers

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

The temperature of the air in V rises (D) Signup and view all the answers

What is the purpose of the PT326 Process Trainer Manual?

To provide more information about the system, including General Description, Specifications, Installation, and Operation (D) 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?

qt (B) Signup and view all the answers

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

q (D) Signup and view all the answers