Pneumatic Systems and PLCs Quiz

What is the main purpose of an Air Preparation Unit (APU) in a pneumatic system?

• Increase electrical voltage

• Clean and regulate compressed air

• Detect pressure changes

• Control actuator speed

Which part of the Air Preparation Unit removes dirt, water, and oil particles from compressed air?

• Regulator

• Filter

• Lubricator

• Pressure switch

What is the main function of a check valve in a pneumatic system?

• Allow air flow in one direction only

• Regulate system pressure

• Reduce actuator speed

• Measure temperature

Which component protects a pneumatic system from dangerous pressure build-up?

• Flow control valve

• Relief valve

• Position sensor

• Lubricator

What does the arrow symbol on a flow control valve indicate?

• Airflow direction

• Electrical current direction

• Pressure release point

• Valve position

What is the main function of a PLC CPU?

• Store hydraulic fluid

• Execute the control program and process data

• Convert AC to DC power

• Increase air pressure

Which PLC component is used to connect sensors and input devices to the system?

• Output module

• Input module

• CPU

• Power supply

In PLC operation, what does the input scan step do?

• Activates output devices

• Reads the status of input devices

• Releases excess voltage

• Changes ladder logic programs

What is the purpose of a PLC output module?

• Store data for later use

• Send signals to control actuators and machines

• Connect output devices to the PLC

• Regulate program execution speed

Why is proper grounding important when working with PLCs?

• To improve airflow

• To prevent electrical shock and protect components

• To make actuators faster

• To increase scan speed