Question 1

Photoelectric switches consist of three basic components: the transmitter, the receiver, and the switching device.

Accepted Answer

Photoelectric switches operate by emitting a light beam from the transmitter, which is received by the receiver. When the light beam is interrupted or reflected, the switching device activates, changing the electrical output.

Question 2

A relay with heavy-duty contacts is called a ____.&#10;A) contactor&#10;B) latching relay&#10;C) pilot-duty relay&#10;D) time-delay relay

Accepted Answer

A contactor is a type of relay designed to handle high power applications, typically used for switching electric motors and lighting loads. It is characterized by its heavy-duty contacts capable of carrying large currents.

Question 3

____ switches are automatic devices that consist of an actuator, a body, and one or more contact blocks.&#10;A) Proximity&#10;B) Limit&#10;C) Hand-off-automatic&#10;D) Photoelectric

Accepted Answer

Limit switches are designed to be activated by a physical force or presence, often through a lever or plunger that, when moved, triggers the switch. This makes them automatic devices that consist of an actuator (the moving part that is triggered), a body (the housing of the switch), and one or more contact blocks (the electrical contacts that are made or broken when the switch is activated).

Question 4

A capacitive proximity switch cannot sense nonconductive (nonferrous) material.

Accepted Answer

A capacitive proximity switch can sense both metallic and non-metallic materials, including nonconductive (nonferrous) materials, because it detects changes in capacitance caused by the presence of an object, regardless of its conductivity.

Question 5

Rotary switches are sometimes known as ____ switches.&#10;A) selector&#10;B) circular&#10;C) proximity&#10;D) make before break

Accepted Answer

Rotary switches are often referred to as selector switches because they allow the user to select among different options or circuits by rotating a knob or a lever.

Question 6

Which object characteristics are most easily detected by a standard diffuse sensor?&#10;A) Light-colored, rough surface&#10;B) Dark-colored, smooth surface&#10;C) Light-colored, smooth surface&#10;D) Dark-colored, rough surface

Accepted Answer

Diffuse sensors work by emitting light towards an object and then detecting the amount of light that is reflected back. A light-colored, smooth surface reflects more light than a dark-colored or rough surface, making it easier for the sensor to detect.

Question 7

Which type of sensor is designed to sense an object but ignore the background?&#10;A) Wide-angle diffuse&#10;B) Background suppression sensor&#10;C) Fixed-focus diffuse&#10;D) Polarized retro-reflective

Accepted Answer

Background suppression sensors are specifically designed to detect an object while ignoring the background. They use a technology that allows them to differentiate between the target object and the background based on the distance, ensuring that only the object within a certain range is detected.

Question 8

There are three basic methods of operating a photo switch: thru-beam, retro-reflective, and specular.

Accepted Answer

The three basic methods of operating a photo switch are thru-beam, retro-reflective, and diffuse. Specular is not a basic method of operating a photo switch; it relates more to the type of reflection from a surface.

Question 9

Photoelectric switches are contact sensors.

Accepted Answer

Photoelectric switches are non-contact sensors that use a beam of light to detect the presence or absence of an object.

Question 10

A(n) ____ is a signaling apparatus that may be audible or visual.&#10;A) communicator&#10;B) pilot light&#10;C) status light&#10;D) annunciator

Accepted Answer

An annunciator is a signaling apparatus that alerts users through audible or visual means, often used in control panels or systems to indicate status or alarms.

Question 11

Thru-beam sensing may be used over distances up to ____ feet.&#10;A) 10&#10;B) 100&#10;C) 250&#10;D) 700

Accepted Answer

The answer of Thru-beam sensing may be used over distances...

Question 12

The ____ sensor utilizes a focusing lens to create a focal point.&#10;A) retro-reflective&#10;B) broad-focus thru-beam&#10;C) fixed-focus reflective&#10;D) fixed-focus diffuse

Accepted Answer

The answer of The ____ sensor utilizes a focusing lens...

Question 13

A ____ sensor houses the transmitter and receiver in a single unit.&#10;A) diffuse&#10;B) thru-beam&#10;C) retro-reflective&#10;D) specular

Accepted Answer

The answer of A ____ sensor houses the transmitter and...

Question 14

There are essentially two different types of motor starters: the standard motor starter and the ____ motor starter.&#10;A) AC/DC&#10;B) multispeed&#10;C) reversing&#10;D) heavy-duty

Accepted Answer

The answer of There are essentially two different types of...

Question 15

Push buttons may operate on a momentary basis or be mechanically held.

Accepted Answer

The answer of Push buttons may operate on a momentary...

Deck 20: Motor Control Devices and Circuits