Question 1

Electronic controls are commonly called ____.
A) discrete digital controls
B) direct analog controls
C) direct digital controls
D) discrete event controls

Accepted Answer

Direct digital controls (DDC) are a type of electronic control system used in building automation. They use microprocessors to manage and automate building systems such as HVAC, lighting, and security. DDC systems are capable of communicating with other systems to optimize building performance and reduce energy consumption.

Question 2

The controlled environment could be controlled by an array of ____ such as dampers, fans, variable-frequency drives.
A) direct digital controls
B) controlled output devices
C) controlled input devices
D) operational devices

Accepted Answer

Controlled output devices such as dampers, fans, variable-frequency drives are used to control the environment by adjusting the output based on the input from the control system.

Question 3

The pilot positioner has a main air supply that is governed by the ____.
A) internal switch
B) internal lockout
C) internal diaphragm
D) internal float

Accepted Answer

The main air supply of the pilot positioner is controlled by an internal diaphragm.

Question 4

In most system compressors, the compressors are controlled with a ____.
A) pressure switch
B) heat switch
C) limiter
D) governor

Accepted Answer

In most systems, the compressors are controlled with a pressure switch. The pressure switch monitors the pressure in the system and shuts off the compressor when it reaches a certain pressure limit, and turns it back on again when the pressure drops. This ensures that the compressor is not overworking and that the system is functioning properly.

Question 5

Controllers are devices that can measure some type of environmental parameter or a controlled variable and convert this parameter to a value that the controller can understand.

Accepted Answer

Controllers are devices that manage or regulate the behavior of other devices or systems, often using input from sensors that measure environmental parameters. Sensors, not controllers, are responsible for measuring and converting environmental parameters into understandable values.

Question 6

Today control output devices can receive signals as either analog or digital.

Accepted Answer

Control output devices, such as motors, can receive signals in both analog (continuous range of values) and digital (discrete values) formats.

Question 7

A device called a ____ is used to control the large volume of air in a air conditioning system.
A) pilot lockout
B) pilot positioner
C) pilot fixator
D) pilot engagement

Accepted Answer

A pilot positioner is a device that controls the position of the pilot valve, which in turn controls the volume of air in an air conditioning system. It ensures that the proper amount of air is flowing through the system to maintain desired conditions. Pilot lockout, fixator, and engagement are not related to air conditioning systems.

Question 8

Space temperature is the only temperature that is important in modern systems.

Accepted Answer

While space temperature is an important factor in modern systems, there are other temperatures that are also important, such as the temperature of the equipment or machinery being used, the temperature of fluids or gases being transported, and the temperature of the environment outside the building.

Question 9

In a(n) ____ loop, all changes happen within the loop.
A) open
B) modified-closed
C) modified-open
D) closed

Accepted Answer

In a closed loop, all changes or adjustments happen within the loop itself, allowing for self-regulation and automatic adjustments based on feedback.

Question 10

All control systems can be subdivided into ____, no matter how many controls there are.
A) throttle loops
B) control loops
C) control segments
D) sensor segments

Accepted Answer

Control systems can be subdivided into control loops, which consist of input sensors, a controller, and output actuators. Throttle loops and sensor segments are not applicable for all control systems, and control segments is not a commonly used term.

Question 11

The very first control systems were used to start and stop the various components.

Accepted Answer

The very first control systems were primitive and served basic functions such as turning components on and off.

Question 12

Controlling the water flow to the room's needs is called ____.
A) modulating flow
B) regulating flow
C) operating flow
D) systemic flow

Accepted Answer

Modulating flow refers to adjusting the flow of water to meet the specific needs or conditions of a room, such as temperature or humidity control.

Question 13

The temperature in the room is known as the ____ air temperature.
A) causal
B) associated
C) variable
D) ambient

Accepted Answer

The term "ambient" is commonly used to describe the temperature in a room or space, indicating the surrounding or prevailing conditions. The term "causal" pertains to the cause or reason for something, while "associated" refers to a connection or relationship between two things. "Variable" refers to something that can change or vary. None of these definitions accurately describe the temperature in a room.

Question 14

____ control systems were used before electronics.
A) Pneumatic
B) Manual
C) Digital
D) Mechanical

Accepted Answer

Before electronics, control systems were commonly operated using either pneumatic or mechanical means. Pneumatic systems use compressed air or gas to control motion or pressure, while mechanical systems rely on physical components such as levers and gears. Therefore, the best choices are A) Pneumatic and D) Mechanical.

Question 15

____, usually housed internally inside the controller, convert the information from either analog to digital (A/D) or digital to analog (D/A) format.
A) Signal converters
B) Transceivers
C) Signal processors
D) Signal managers

Accepted Answer

Signal converters convert analog signals to digital or digital signals to analog. Transceivers are used for transmitting and receiving signals, signal processors manipulate signals, and signal managers generally do not exist as a specified component in a controller.

Question 16

A ____ is either in the pressure reducer or in the downstream side of the system to ensure that the control air pressure does not exceed about 30 psig.
A) blowback valve
B) relief valve
C) pulldown valve
D) pressure valve

Accepted Answer

A relief valve is designed to relieve pressure in a system once it reaches a certain point, in this case, approximately 30 psig, preventing damage or failure to the system. The other options are not commonly used in control air systems.

Question 17

Pneumatic controls must have a permanent air supply that is ____.
A) clean and moist
B) clean and warm
C) warm and dry
D) clean and dry

Accepted Answer

Pneumatic controls require a clean and dry air supply to ensure their proper functioning. Moisture or humidity in the air supply can lead to rust and corrosion, which can cause damage to the control components. Similarly, warm or heated air can cause expansion and contraction in the control lines, leading to leaks and inaccurate readings. Hence, a clean and dry air supply is mandatory for the safe and efficient operation of pneumatic controls.

Question 18

Modern control systems only have on-off control capability.

Accepted Answer

Modern control systems have advanced control capabilities, including proportional, integral, derivative (PID) control, adaptive control, and model predictive control. On-off control is a basic type of control that simply switches a device on or off based on a set point or threshold, and is typically used in simple applications.

Question 19

A ____ reacts to stop, start, or modulate the flow of water, air, or refrigerant to the system or conditioned space
A) sensor
B) controller
C) controlled device
D) none of the above

Accepted Answer

A controlled device is the best choice because sensors detect changes and controllers dictate what actions to take, but controlled devices are the physical components that actually carry out those actions, such as valves or dampers, to stop, start, or modulate the flow of water, air, or refrigerants.

Question 20

Most system compressors provide ____ psig of air pressure to the storage tank.
A) 90 to 100
B) 90 to 125
C) 100 to 125
D) 100 to 150

Accepted Answer

The answer of Most system compressors provide ____ psig of...

Quiz 16: Advanced Automatic Controlsdirect Digital Controls Ddc and Pneumatics

Electronic controls are commonly called ____.

The controlled environment could be controlled by an array of ____ such as dampers, fans, variable-frequency drives.

The pilot positioner has a main air supply that is governed by the ____.

In most system compressors, the compressors are controlled with a ____.

Controllers are devices that can measure some type of environmental parameter or a controlled variable and convert this parameter to a value that the controller can understand.

Today control output devices can receive signals as either analog or digital.

A device called a ____ is used to control the large volume of air in a air conditioning system.

Space temperature is the only temperature that is important in modern systems.

In a(n) ____ loop, all changes happen within the loop.

All control systems can be subdivided into ____, no matter how many controls there are.

The very first control systems were used to start and stop the various components.

Controlling the water flow to the room's needs is called ____.

The temperature in the room is known as the ____ air temperature.

____ control systems were used before electronics.

____, usually housed internally inside the controller, convert the information from either analog to digital (A/D) or digital to analog (D/A) format.

A ____ is either in the pressure reducer or in the downstream side of the system to ensure that the control air pressure does not exceed about 30 psig.

Pneumatic controls must have a permanent air supply that is ____.

Modern control systems only have on-off control capability.

A ____ reacts to stop, start, or modulate the flow of water, air, or refrigerant to the system or conditioned space

Most system compressors provide ____ psig of air pressure to the storage tank.