If I have my handheld voltmeter, which of the following input signals to o PLC w

Question

If I have my handheld voltmeter, which of the following input signals to o PLC will be difficult to measure and confirm that the signal is correct? a) A signal from a thermocouple. b) A signal from a pushbutton. c) A signal from a reflective photosensor. d) A signal from an inductive proximity sensor. What type of sensor is the best to use to measure corrugated cardboard boxes of varying sizes traveling down a conveyor? a) An inductive proximity sensor. b) A capacitive proximity sensor. c) A Hall effect or reed switch sensor. d) A photosensor.

Explanation / Answer

14. a. A signal from thermocouple would be difficult to confirm that the signal is correct.

15. b. A capacitive proximity sensor is usually good at detecting displacing object.

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