Question 1

Limit switches may be momentary contact or maintained contact types.

Accepted Answer

This statement is true. Limit switches can be either momentary contact or maintained contact types. A momentary contact limit switch only activates while it is being pressed or triggered, whereas a maintained contact limit switch stays on until it is manually turned off. Limit switches may be either momentary contact or maintained contact types depending on their application and design.

Question 2

The emits a high-frequency sound wave and then detects the echo when it bounces off the object.&#10;A)photodetector&#10;B)ultrasonic detector&#10;C)proximity detector&#10;D)proximity sensor

Accepted Answer

The process described is that of ultrasound technology, which uses high-frequency sound waves and their echoes for detection, making ultrasonic detector the most appropriate choice. The other options, such as photodetector and proximity sensor, are not relevant to this process. Ultrasonic detectors emit high-frequency sound waves and detect the echo when it bounces off the object. Photodetectors detect light, proximity detectors use infrared light, and proximity sensors can use various methods such as ultrasonic or infrared. Therefore, ultrasonic detector is the best choice for this scenario.

Question 3

are fast acting and are often used to measure the speed of rotating objects.&#10;A)Proximity detectors&#10;B)Ultrasonic detectors&#10;C)Hall effect sensors&#10;D)Proximity sensors

Accepted Answer

Hall effect sensors are fast acting and can accurately measure the speed of rotating objects by detecting changes in magnetic fields. Proximity detectors and sensors can also be used for speed measurement, but they may not be as precise or fast as Hall effect sensors. Ultrasonic detectors are typically used for distance measurements rather than speed measurements. Hall effect sensors are fast-acting and can accurately measure the speed of rotating objects. They work by detecting changes in a magnetic field and converting those changes into electrical signals. Proximity detectors and ultrasonic detectors may also be used for speed measurements, but they are not specifically designed for this purpose and may not be as accurate or reliable as Hall effect sensors. Proximity sensors are typically used for detecting the presence or absence of objects, rather than measuring their speed.

Question 4

Most microswitches require a movement of approximately to change the contact position.&#10;A)0.38 mm&#10;B)0.58 mm&#10;C)0.78 mm&#10;D)0.98 mm

Accepted Answer

Most microswitches require a movement of approximately 0.38 mm to change the contact position. This small movement is what makes them highly sensitive and suitable for applications where precision is crucial.

Question 5

Pancake-type solid-state sensors are designed to detect targets at distances up to .&#10;A)2.0 in.&#10;B)4.0 in.&#10;C)6.0 in.&#10;D)8.0 in.

Accepted Answer

Pancake-type solid-state sensors are typically designed to detect targets at distances up to 4.0 inches.

Question 6

Inductive proximity switches operate on the eddy current principle.

Accepted Answer

Inductive proximity switches use eddy currents to detect distance or proximity of metal objects. Inductive proximity switches operate on the eddy current principle, where a magnetic field generated by the proximity switch induces eddy currents in the metal target, which are detected and used to trigger an output signal.

Question 7

Capacitive proximity sensors are designed to detect only metallic targets.

Accepted Answer

Capacitive proximity sensors can also detect non-metallic targets such as plastics, liquids, and powders. Capacitive proximity sensors can detect both metallic and non-metallic targets, as long as they have a high enough dielectric constant.

Question 8

Contacts must be selected according to the proper load.

Accepted Answer

Contacts in electrical systems must be selected according to the proper load to ensure safe and efficient operation of the system. Choosing contacts that are not rated for the appropriate load can result in damage to the system and pose a safety hazard. To ensure safety and functionality, contacts must be chosen depending on the specific load and usage requirements. Using the wrong type of contact can cause damage, malfunction, or even fire hazards.

Question 9

Some reflector units have a range of 2 feet or more.

Accepted Answer

The answer of Some reflector units have a range of...

Question 10

used in burglar alarm systems commonly use infrared LEDs as the light source.&#10;A)Proximity sensors&#10;B)Ultrasonic detectors&#10;C)Proximity detectors&#10;D)Photodetectors

Accepted Answer

Photodetectors are the sensors commonly used in burglar alarm systems, which detect changes in light levels. Infrared LEDs are used as the light source for these detectors, allowing them to detect movement or interruption of the infrared light beam, triggering the alarm. Photodetectors are used in burglar alarm systems and commonly use infrared LEDs as the light source. This is because infrared light is invisible to the human eye, making it a covert way to detect movement and trigger an alarm. Proximity sensors and detectors are different types of sensors that use various technologies such as ultrasonic or microwave to detect movement and trigger an alarm.

Deck 13: Limit Switches and Proximity Control