Test your knowledge of PLC systems with our quiz on identifying I/O examples prepared to understand input and output devices.
Identifying I/O Examples in PLC
This PLC video explains the detailed answers for these inputs and outputs examples.
Question 1
Which of the following is an example of a PLC digital input?
A. Motor
B. Proximity sensor
C. Solenoid valve
D. Light bulb
Show the Answer
Proximity sensor
Question 2
Which device is typically connected to a PLC analog input?
A. Relay
B. Alarm siren
C. Indicator light
D. Thermocouple
Show the Answer
Thermocouple
Question 3
Identify the device that serves as a PLC digital output.
A. Thermistor
B. Indicator light
C. Potentiometer
D. Pressure sensor
Show the Answer
Indicator light
Question 4
Which of the following is an example of a PLC analog output?
A. Variable frequency drive (VFD)
B. Push button
C. Photoelectric sensor
D. Limit switch
Show the Answer
Variable frequency drive (VFD)
Question 5
What type of device would be connected to a PLC as an input to monitor environmental conditions?
A. Contactor
B. Actuator
C. Humidity sensor
D. Pilot light
Show the Answer
Humidity sensor
Question 6
Which device is often used as a digital output in PLC systems?
A. Solenoid valve
B. Pressure transducer
C. RTD sensor
D. Thermocouple
Show the Answer
Solenoid valve
Question 7
What kind of input would a flow meter provide to a PLC?
A. Digital output
B. Analog output
C. Analog input
D. Digital input
Show the Answer
Analog input
Question 8
Which device is commonly connected as a PLC digital input for safety interlock?
A. Analog signal generator
B. Emergency stop button
C. Motor starter
D. Variable speed drive
Show the Answer
Emergency stop button
Question 9
Identify an example of a PLC analog output device.
A. Buzzer
B. Limit switch
C. Pneumatic actuator
D. Float switch
Show the Answer
Pneumatic actuator
Question 10
Which of the following devices provides a digital input to a PLC?
A. Analog transmitter
B. Push button
C. Temperature controller
D. Servo motor
Show the Answer
Push button
Question 11
Which device typically serves as a PLC digital input for position detection?
A. Variable resistor
B. DC motor
C. Hydraulic pump
D. Limit switch
Show the Answer
Limit switch
Question 12
Identify the PLC input device used to measure liquid levels.
A. LED indicator
B. Heater element
C. AC motor
D. Float switch
Show the Answer
Float switch
Question 13
Which of these is an example of a PLC analog output device used for control?
A. Magnetic reed switch
B. Emergency siren
C. Motor speed controller
D. Pressure switch
Show the Answer
Motor speed controller
Question 14
What type of signal does a photoelectric sensor provide to a PLC?
A. Analog input
B. Analog output
C. Digital input
D. Digital output
Show the Answer
Digital input
Question 15
Which device is a common example of a PLC digital output used for alerting?
A. Buzzer
B. RTD sensor
C. Thermocouple
D. Flow transmitter
Show the Answer
Buzzer
Question 16
Which of the following is used as an analog input device in a PLC system for temperature measurement?
A. Solenoid coil
B. Contact relay
C. RTD (Resistance Temperature Detector)
D. Strobe light
Show the Answer
RTD (Resistance Temperature Detector)
Question 17
Identify the device that serves as a PLC output for mechanical motion.
A. Limit switch
B. Servo motor
C. Pressure sensor
D. Digital counter
Show the Answer
Servo motor
Question 18
Which type of device is connected to a PLC to provide an analog input for fluid pressure?
A. Contactor
B. LED indicator
C. Pressure transducer
D. Push button
Show the Answer
Pressure transducer
Question 19
What is a typical example of a PLC digital output used for signaling?
A. Analog voltmeter
B. Thermistor
C. Proximity sensor
D. Strobe light
Show the Answer
Strobe light
Question 20
Which device is often used as a digital input for detecting metal objects?
A. Inductive proximity sensor
B. Variable resistor
C. Capacitive sensor
D. Flow meter
Show the Answer
Inductive proximity sensor
Question 21
Which of the following devices is an example of a PLC digital output used for control?
A. Temperature probe
B. Ultrasonic sensor
C. Relay
D. Thermocouple
Show the Answer
Relay
Question 22
Identify the device commonly used as a PLC analog input for pH measurement.
A. Light curtain
B. pH sensor
C. Contactor
D. Proximity switch
Show the Answer
pH sensor
Question 23
Which device serves as a digital output in a PLC system for actuating a mechanical device?
A. Humidity sensor
B. Flow sensor
C. Strain gauge
D. Solenoid actuator
Show the Answer
Solenoid actuator
Question 24
Which device is commonly used as a digital input for presence detection in PLCs?
A. Thermal couple
B. Variable resistor
C. Actuator
D. Photoelectric sensor
Show the Answer
Photoelectric sensor
Question 25
Identify the device typically connected to a PLC as an output to control lighting.
A. Pressure gauge
B. Limit switch
C. LED light
D. RTD sensor
Show the Answer
LED light
Question 26
Which of these devices is used as an analog input in PLCs to monitor rotational speed?
A. Relay switch
B. Solenoid coil
C. Push button
D. Tachometer
Show the Answer
Tachometer
Question 27
What is a typical example of a PLC digital input for machine safety?
A. Variable speed drive
B. Flow valve
C. Safety light curtain
D. Heater element
Show the Answer
Safety light curtain
Question 28
Which device is often used as an analog output to control valve position in PLC systems?
A. LED indicator
B. Magnetic switch
C. Electro-pneumatic valve positioner
D. Limit switch
Show the Answer
Electro-pneumatic valve positioner
Question 29
Which of the following devices serves as a PLC input for measuring weight?
A. Solenoid valve
B. Load cell
C. Contact relay
D. Flashing beacon
Show the Answer
Load cell
Question 30
Which device is commonly used as a PLC digital input to detect motion?
A. Thermistor
B. Motion detector
C. Pressure gauge
D. Analog voltmeter
Show the Answer
Motion detector
Question 31
Which type of device is connected to a PLC to measure light intensity?
A. Photovoltaic cell
B. Contactor
C. Solenoid valve
D. Heater coil
Show the Answer
Photovoltaic cell
Question 32
What is a typical example of a PLC digital output used to trigger alarms?
A. Analog transmitter
B. RTD sensor
C. Siren
D. Thermocouple
Show the Answer
Siren
Question 33
Which device is often connected as a PLC input to measure distance?
A. Ultrasonic sensor
B. Pilot light
C. Relay switch
D. Buzzer
Show the Answer
Ultrasonic sensor
Question 34
Identify the device used as an analog input for flow measurement in a PLC system.
A. Flow transmitter
B. Flashing light
C. Contactor
D. Push button
Show the Answer
Flow transmitter
Question 35
What type of device is a typical PLC analog output for heating control?
A. LED display
B. Proximity switch
C. Contact relay
D. Heating element
Show the Answer
Heating element
Question 36
Which device is often used as a digital input for detecting liquid presence?
A. Liquid level switch
B. Thermistor
C. Pneumatic actuator
D. AC motor
Show the Answer
Liquid level switch
Question 37
Identify the device that serves as a PLC analog output for visual display control.
A. Contactor
B. Solenoid valve
C. Analog voltmeter
D. Proximity sensor
Show the Answer
Analog voltmeter
Question 38
Which of these devices is commonly used as a PLC digital output to initiate mechanical movement?
A. RTD sensor
B. Analog voltmeter
C. Pressure sensor
D. Actuator
Show the Answer
Actuator
Question 39
What is a typical example of a PLC analog input used for fluid flow measurement?
A. Proximity switch
B. Flow meter
C. Strobe light
D. Contactor
Show the Answer
Flow meter
Question 40
Identify the device that serves as a PLC output for motion control.
A. Stepper motor
B. Pressure sensor
C. Limit switch
D. Digital counter
Show the Answer
Stepper motor
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