Question 1

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 used in a variety of applications, including aviation and industrial settings, to alert operators to specific issues or conditions. Annunciators may have audible or visual components.

Question 2

Which object characteristics are most easily detected with a 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 best with light-colored and smooth surfaces because they reflect more light back to the sensor. Dark-colored and rough surfaces absorb more light, making it difficult for a diffuse sensor to detect them accurately.

Question 3

A(n) ____ 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

A retro-reflective sensor houses the transmitter and receiver in a single unit.

Question 4

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 5

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

Accepted Answer

A contactor is designed for heavy-duty applications and typically has larger contacts and can handle higher current loads than a standard relay.

Question 6

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 standard motor starter simply turns the motor on and off, while the reversing motor starter allows the motor to run in both directions. The AC/DC and multispeed motor starters are also useful in certain applications, but they are not the only other type of motor starter, and the question specifically asks for the other type. The heavy-duty motor starter is not a distinct type of starter, but rather refers to starters that are designed for larger or more demanding motors.

Question 7

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

Accepted Answer

This statement is true. Photoelectric switches typically contain a transmitter, which emits a beam of light, a receiver, which detects the light beam and produces a signal, and a switching device, which reacts to the signal and causes an action to occur, such as turning on a light or opening a door.

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

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) Standard diffuse&#10;D) Retro-reflective

Accepted Answer

A background suppression sensor is designed to only detect objects within a specific distance range while ignoring the background. This is achieved through the use of specialized optics or algorithms that filter out extraneous signals. Wide-angle diffuse and standard diffuse sensors are more general purpose and would not be as effective in this specific application. Retro-reflective sensors rely on the object reflecting the sensor's beam back to the receiver and would not work well if the background is reflective as well.

Question 10

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 11

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 12

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

Accepted Answer

The answer of A capacitive proximity switch cannot sense nonconductive...

Question 13

____ 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

The answer of ____ switches are automatic devices that consist...

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

The answer of Rotary switches are sometimes known as ____...

Deck 20: Motor Control Devices and Circuits