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Inst Tools > Blog > Control Systems MCQ > AI, AO, DI, DO Questions (PLC I/O Types)

AI, AO, DI, DO Questions (PLC I/O Types)

Understand the PLC I/O types with our top questions on AI, AO, DI, and DO for learning automation and control technologies

Last updated: August 31, 2024 8:13 pm
Editorial Staff
Control Systems MCQ Instrumentation MCQ PLC Tutorials
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Understand the PLC I/O types with our top questions on AI, AO, DI, and DO for learning automation and control technologies

Contents
AI, AO, DI, DO QuestionsA thermocouple connected to a PLC is an example of which type of signal?What type of I/O device is a push button when used in a PLC system?A variable frequency drive (VFD) receiving signals from a PLC is classified as? (from PLC point of view)Which type of signal is provided by a limit switch to a PLC?Identify the type of device a solenoid valve is when controlled by a PLC.What type of signal does a flow transmitter provide to a PLC?Which type of I/O is a proximity sensor in a PLC system?A PLC controlling an actuator to move a lever is an example of which type of output?What type of signal does a humidity sensor provide to a PLC?Which type of I/O device is an LED indicator controlled by a PLC?What type of I/O device is a load cell when used in a PLC system?A strobe light controlled by a PLC is an example of which type of output?Which type of signal does a pressure transducer provide to a PLC?Identify the type of device a relay switch is when connected to a PLC.What type of I/O device is a photoelectric sensor in a PLC system?A PLC controlling a heating element is an example of which type of output?Which type of signal does a tachometer provide to a PLC?What type of I/O device is a safety light curtain in a PLC system?A PLC controlling a motor speed through a VFD is an example of which type of output?Which type of I/O device is a magnetic reed switch used for position detection?A thermistor used in a PLC system is an example of which type of signal?What type of I/O device is an emergency stop button in a PLC system?A pressure gauge/sensor providing signals to a PLC is classified as which type of input?Which type of I/O device is an actuator controlled by a PLC?What type of signal does a potentiometer provide to a PLC?A pilot light controlled by a PLC is an example of which type of output?Identify the type of device a contactor is when controlled by a PLC.What type of I/O device is a flow meter in a PLC system?Which type of I/O device is a buzzer controlled by a PLC?Identify the type of device an analog voltmeter is when connected to a PLC.What type of I/O device is a strain gauge when used in a PLC system?A flashing beacon controlled by a PLC is an example of which type of output?Which type of signal does an RTD sensor provide to a PLC?Identify the type of device a photoelectric sensor is when connected to a PLC.What type of signal does a digital counter provide to a PLC?A pneumatic actuator controlled by a PLC is an example of which type of output?Which type of signal does an ultrasonic sensor provide to a PLC?Which type of I/O device is a pressure sensor in a PLC system?

AI, AO, DI, DO Questions

The following video provides detailed explanations for the PLC IO questions.

PLC I/O Types: AI, AO, DI, and DO Questions

Question 1

A thermocouple connected to a PLC is an example of which type of signal?

A. AI

B. AO

C. DI

D. DO

Show the Answer

AI

Question 2

What type of I/O device is a push button when used in a PLC system?

A. DI

B. AI

C. AO

D. DO

Show the Answer

DI

Question 3

A variable frequency drive (VFD) receiving signals from a PLC is classified as? (from PLC point of view)

A. AO

B. AI

C. DI

D. DO

Show the Answer

AO

Question 4

Which type of signal is provided by a limit switch to a PLC?

A. DI

B. AI

C. AO

D. DO

Show the Answer

DI

Question 5

Identify the type of device a solenoid valve is when controlled by a PLC.

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 6

What type of signal does a flow transmitter provide to a PLC?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Question 7

Which type of I/O is a proximity sensor in a PLC system?

A. DI

B. AI

C. AO

D. DO

Show the Answer

DI

Question 8

A PLC controlling an actuator to move a lever is an example of which type of output?

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 9

What type of signal does a humidity sensor provide to a PLC?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Question 10

Which type of I/O device is an LED indicator controlled by a PLC?

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 11

What type of I/O device is a load cell when used in a PLC system?

A. AI

B. AO

C. DI

D. DO

Show the Answer

AI

Question 12

A strobe light controlled by a PLC is an example of which type of output?

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 13

Which type of signal does a pressure transducer provide to a PLC?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Question 14

Identify the type of device a relay switch is when connected to a PLC.

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 15

What type of I/O device is a photoelectric sensor in a PLC system?

A. DI

B. AI

C. AO

D. DO

Show the Answer

DI

Question 16

A PLC controlling a heating element is an example of which type of output?

A. AO

B. AI

C. DI

D. DO

Show the Answer

AO

Question 17

Which type of signal does a tachometer provide to a PLC?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Question 18

What type of I/O device is a safety light curtain in a PLC system?

A. DI

B. AI

C. AO

D. DO

Show the Answer

DI

Question 19

A PLC controlling a motor speed through a VFD is an example of which type of output?

A. AO

B. AI

C. DI

D. DO

Show the Answer

AO

Question 20

Which type of I/O device is a magnetic reed switch used for position detection?

A. DI

B. AI

C. AO

D. DO

Show the Answer

DI

Question 21

A thermistor used in a PLC system is an example of which type of signal?

A. AI

B. AO

C. DI

D. DO

Show the Answer

AI

Question 22

What type of I/O device is an emergency stop button in a PLC system?

A. DI

B. AI

C. AO

D. DO

Show the Answer

DI

Question 23

A pressure gauge/sensor providing signals to a PLC is classified as which type of input?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Question 24

Which type of I/O device is an actuator controlled by a PLC?

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 25

What type of signal does a potentiometer provide to a PLC?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Question 26

A pilot light controlled by a PLC is an example of which type of output?

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 27

Identify the type of device a contactor is when controlled by a PLC.

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 28

What type of I/O device is a flow meter in a PLC system?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Question 29

Which type of I/O device is a buzzer controlled by a PLC?

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 30

Identify the type of device an analog voltmeter is when connected to a PLC.

A. AO

B. AI

C. DI

D. DO

Show the Answer

AO

Question 31

What type of I/O device is a strain gauge when used in a PLC system?

A. AI

B. AO

C. DI

D. DO

Show the Answer

AI

Question 32

A flashing beacon controlled by a PLC is an example of which type of output?

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 33

Which type of signal does an RTD sensor provide to a PLC?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Question 34

Identify the type of device a photoelectric sensor is when connected to a PLC.

A. DI

B. AI

C. AO

D. DO

Show the Answer

DI

Question 35

What type of signal does a digital counter provide to a PLC?

A. DI

B. AI

C. AO

D. DO

Show the Answer

DI

Question 36

A pneumatic actuator controlled by a PLC is an example of which type of output?

A. DO

B. AI

C. AO

D. DI

Show the Answer

DO

Question 37

Which type of signal does an ultrasonic sensor provide to a PLC?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Question 38

Which type of I/O device is a pressure sensor in a PLC system?

A. AI

B. DI

C. AO

D. DO

Show the Answer

AI

Read Next:

  • Wiring Diagrams of PLC Systems
  • PLC Digital Signals Wiring Techniques
  • Micro PLC Hardware Configuration
  • Flexible PLC Input Output Modules
  • What are AI, AO, DI, and DO?

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