28 Questions
What is the main difference between open and closed control loops?
Open control loops are dependent on their output variable, closed control loops are independent.
What is the purpose of a controller in a process control system?
To regulate the control of the process
Which component of a process control loop is responsible for responding directly to the value of the variable?
Detector
Which type of control loop is manual and independent of its output variable?
Open Control Loops
What does the regulating unit represent in a process control system?
The final controlling element in the system
Which component in a process control loop accepts the command signal and determines the deviation?
Comparator
What is the primary purpose of an amplifier circuit on a ship?
Amplify audio signals
Which of the following is NOT a function of an amplifier circuit on a ship based on the text?
Analog to digital conversion
In what ship components or systems can amplifier circuits typically be found?
VHF and PA systems
What type of control theory is discussed at the end of Topic 1 in the provided text?
Integral control theory
What are disturbances in control theory according to the text?
Variables that deviate controlled variables from set point
Which of the following is an example of a disturbance in a manufacturing process?
Sudden change in water temperature
What is the advantage of having a standard range for equipment in terms of control air supply?
All equipment is sold ready calibrated
Which type of signal is used to represent the minimum and maximum signals in control air supply?
4 to 20 mA
In shipboard systems, what is the purpose of converting the output into the standard range for control air supply?
To make the output consistent with other equipment
What type of electrical signal was used by older electrical equipment before the standard 4 to 20 mA range?
0 to 10 V
Which device in shipboard systems is responsible for ensuring that the output is within the standard control air supply range?
Processing and conditioning unit
What is the main purpose of an amplifier in an electronic circuit?
To produce an output signal larger than the input signal
How are operational amplifiers commonly used in electronic circuits for marine applications?
To control and amplify voltage or current signals
Why do compact, small signal amplifiers find common usage in electronic components?
Because they are capable of raising small input signals to a larger magnitude
How is the output signal of an operational amplifier controlled?
By the input signal that drives the amplifier
Where does the additional power to increase the output signal come from in an amplifier circuit?
Externally provided D.C voltage
What is the purpose of applying derivative control in a system with long time delays between changes in the measured value and their correction?
To compensate for the time delays in the system
Which element acts directly on the controlled body, process, or machine in a servo-mechanism?
Servo-motor
What best describes the actuator in a control valve system?
A motor responsible for moving or turning the valve
In a pneumatic-operated control valve, what are the three parts that can be described?
Motor, valve, positioner
What is the main function of a fail-safe strategy in automatic control systems?
To revert the system to a safe state in case of failure
What element in an automatic control system receives amplifier output and drives the load directly?
Actuator
Test your knowledge on operational amplifiers, commonly used in automation and control circuits for various applications. Understand the purpose of amplifiers in increasing the output signal power level by using an external DC voltage. Explore how input signals are typically voltage or current signals.
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