Analog and Digital Circuits Quiz

What are the two operating states of digital circuits?

• Variable and Constant

• Open and Half-Open

• High and Medium

• On and Off

Which of the following is a typical analog signal range used in PLCs?

• 0 volts DC to 5 volts DC

• 10 volts DC to 20 volts DC

• 5 volts DC to 15 volts DC

• 20 volts DC to 30 volts DC

What is the purpose of a conversion module in a PLC system?

• To amplify signals

• To store signals for later use

• To decrease signal frequency

• To convert signals outside the terminal range

What is required for proportional analog valves to function?

• Internal power supply

• External power supply

• No power supply

• Battery power

Which formula is used to determine the power at a heating element?

• P = E * I

• P = V + I

• P = I / V

• P = V * R