Festo: CH 4-5

What happens to the output voltage in negative-switching sensors when a workpiece approaches?

• It switches over to a voltage of 0 V

• It increases to full supply voltage

• It remains constant

• It fluctuates randomly

What is the function of the downstream electronic unit in an inductive proximity sensor?

• It evaluates the resonant circuit's behavior and actuates the output.

• It generates the magnetic field.

• It stores electrical energy.

• It converts AC to DC.

Which of the following is NOT a characteristic of capacitive proximity sensors?

• Respond to high dielectric constant materials

• Generate electrostatic fields

• Only detect metallic objects

• Form stray fields

What happens when an object interrupts the light beam in a through-beam sensor?

• The light beam is amplified

• A signal is triggered

• The light beam is reflected

• The light beam is absorbed

What is the benefit of using semiconductor LEDs in optical sensors?

• They are expensive

• They are unreliable

• They are durable and easy to install

• They are difficult to align

In a retro-reflective sensor, what happens when an object interrupts the light beam?

• The sensor turns off permanently

• The light beam becomes stronger

• A signal is triggered to initiate a switching operation

• The sensor emits a sound

What is the role of the reflector in a retro-reflective sensor?

• To absorb light

• To emit sound

• To reflect the light beam back to the receiver

• To generate heat

What is the main component that reflects the light beam in a retro-reflective sensor?

• Transmitter

• Receiver

• Reflector

• Battery

What happens to the light beam when it impinges on the receiver in a retro-reflective sensor?

• It is absorbed

• It is reflected back

• It is converted into a signal

• It is amplified

What is the output of a retro-reflective sensor when the light beam is interrupted?

• Temperature change

• ON/OFF signal

• Sound alarm

• Pressure increase