Free ETO Automation & Control Systems Questions and Answers

Question 1

What is the purpose of a Programmable Logic Controller (PLC) in automation?

Accepted Answer

To automatically control machinery

Answer

A Programmable Logic Controller (PLC) is an industrial digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines. Its primary purpose is to automatically monitor input devices and make decisions based on programmed logic to control output devices. This enables precise and repeatable control of complex industrial operations.

Question 2

Which device is used to convert analog signals to digital in control systems?

Accepted Answer

Analog-to-Digital Converter

Answer

An Analog-to-Digital Converter (ADC) is essential in control systems because it translates continuous analog signals, such as temperature or pressure, into discrete digital values. Digital controllers and microprocessors require these digital signals to process information and make precise control decisions. This conversion enables the system to accurately monitor and respond to real-world conditions.

Question 3

What is a sensor’s role in an automated control system?

Accepted Answer

To detect conditions and provide feedback

Answer

In an automated control system, a sensor's role is to detect and measure physical conditions, such as temperature, pressure, or position, and convert them into electrical signals. These signals provide crucial feedback to the control system, allowing it to monitor the current state of the process. This feedback enables the system to compare actual conditions with desired setpoints and make necessary adjustments.

Question 4

Which control system type uses feedback to maintain desired output?

Accepted Answer

Closed-loop control system

Answer

A closed-loop control system uses feedback to continuously monitor its output and compare it to a desired setpoint. If there's a difference, the system automatically adjusts its input to correct the deviation and maintain the desired output. This feedback mechanism makes the system self-regulating, ensuring accuracy and stability despite external disturbances.

Question 5

What is the function of an actuator in automation?

Accepted Answer

To convert signals to motion

Answer

An actuator in automation functions as the 'muscle' of the system, converting a control signal (electrical, hydraulic, or pneumatic) into a physical motion or action. It directly manipulates the physical world, such as opening/closing valves, moving robotic arms, or adjusting dampers. Essentially, actuators execute the commands issued by the control system to achieve a desired physical outcome.

ETO - Electro-Technical Officer Practice Test

ETO - Electro-Technical Officer Practice Test

Free ETO Automation & Control Systems Questions and Answers