Sensors and Actuators

Which type of sensor detects the presence of objects without physical contact?

• Limit switch

• Proximity sensor

• Encoder

• Strain gauge

What principle do capacitive proximity sensors use to detect objects?

• Magnetic field changes

• Light reflection

• Changes in capacitance

• Ultrasonic reflection

Which motor type provides the most precise positioning control?

• AC induction motor

• Stepper motor

• DC motor

• Universal motor

What is the function of an encoder in a motion control system?

• To convert electrical energy to mechanical motion

• To measure position or speed

• To increase motor torque

• To reduce electrical noise

Which sensor would be most appropriate for detecting the level of water in a tank?

• Photoelectric sensor

• Ultrasonic sensor

• Inductive sensor

• Capacitive proximity sensor

What does RTD stand for in temperature sensing?

• Resistance Temperature Detector

• Rapid Thermal Device

• Remote Temperature Display

• Radiant Temperature Diode

Which actuator provides linear motion directly from electrical energy?

• Solenoid

• DC motor

• Stepper motor

• Servo motor

What unit is typically used to measure the output of a pressure sensor?

• Volts

• Amperes

• PSI OR Bar

• Newton-meters

Which type of sensor would be most suitable for detecting transparent plastic bottles on a conveyor?

• Inductive proximity sensor

• Ultrasonic sensor

• Diffuse photoelectric sensor

• Capacitive proximity sensor

What is the purpose of signal conditioning in a sensor system?

• To amplify the sensor signal

• To make the sensor signal suitable for use by control systems

• To filter out electromagnetic interference

• To convert analog signals to digital