1. Contacts must be selected according to the proper load.
a. True
b. False
2. Limit switches may be momentary contact or maintained contact types.
a. True
b. False
3. Capacitive proximity sensors are designed to detect only metallic targets.
a. True
b. False
4. Inductive proximity switches operate on the eddy current principle.
a. True
b. False
5. Some reflector units have a range of 2 feet or more.
a. True
b. False
Name: Class: Date:
Unit 13 Limit Switches and Proximity Control
6. Most microswitches require a movement of approximately ____ to change the contact position.
a. 0.38 mm b. 0.58 mm
c. 0.78 mm d. 0.98 mm
7. Pancake-type solid-state sensors are designed to detect targets at distances up to ____.
a. 2.0 in. b. 4.0 in.
c. 6.0 in. d. 8.0 in.
8. ____ used in burglar alarm systems commonly use infrared LEDs as the light source.
a. Proximity sensors b. Ultrasonic detectors
c. Proximity detectors d. Photodetectors
9. ____ are fast acting and are often used to measure the speed of rotating objects.
a. Proximity detectors b. Ultrasonic detectors
c. Hall effect sensors d. Proximity sensors
10. The ____ emits a high-frequency sound wave and then detects the echo when it bounces off the object.
a. photodetector b. ultrasonic detector
c. proximity detector d. proximity sensor
Name: Class: Date:
Unit 13 Limit Switches and Proximity Control