Question

1. The proximity sensor is used to a. detect presence of metal in the magnetic field b. detects the presence of light in its field c. identify and count wooden blocks d. provide analog signals to the processor 2. A unique feature of the reflective sensor is that it a. needs a reflector to reflect its LED signal back to the detector b. used the reflection of an object to detect presence C. turns off if the light beam is broken d. uses a magnetic field to sense the presence of an object 3. A photoelectric sensor is used to a. provides images of people passing past it b. detect presence by a light beam reflected from the target c. has a long range of detection d. sense intense lighting conditions 4. The proximity sensor uses a. external AC power to operate b. WiFi to connect to the PLC c. the analog input module for connections d. the DC module for connections 5. The photoelectric sensor uses a. external AC power to operate b. WiFi to connect to the PLC c. the analog input module for connections d. the DC module for connections

Answer 1

1. The proximity sensor is used to detect the presence of metal in the magnetic field. And the type of proximity sensor used for this purpose is inductive.

Correct option is A.

2. A unique feature of the reflective sensor is that it uses the reflection of an object to detect its presence.

Correct option is B.

3. A photoelectric sensor is used to detect presence by a light beam reflected from the target. An infrared type of light transmitter is generally used for this purpose.

Correct option is B.

4. The proximity sensor uses external DC supply as input.

Correct option is D.

5. The photoelectric sensor uses external AC power to operate.

Correct option is A.