Deck 16: Advanced Automatic Controlsdirect Digital Controls Ddc and Pneumatics

Question 1

Electronic controls are commonly called ____.

A) discrete digital controls
B) direct analog controls
C) direct digital controls
D) discrete event controls

Answer 1

C

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

Answer 2

B

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

Answer 3

C

Question 4

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

A) pressure switch
B) heat switch
C) limiter
D) governor

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.

Question 6

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

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

Question 8

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

Question 9

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

A) open
B) modified-closed
C) modified-open
D) closed

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

Question 11

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

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

Question 13

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

A) causal
B) associated
C) variable
D) ambient

Question 14

____ control systems were used before electronics.

A) Pneumatic
B) Manual
C) Digital
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

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

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

Question 18

Modern control systems only have on-off control capability.

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

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

Question 21

DDC is a control process in which a microprocessor, acting as a digital controller, constantly updates a database of internal information.

Question 22

_______________________ send information back to the controller in terms of resistance (ohms).

Question 23

The _______________ system actually changes or conditions a signal in three steps.

Question 24

The ____________________ is the device that responds to a change in conditions.

Question 25

__________________________ send information back to the controller in terms of milliamps (mA) or volts.

Question 26

________________ is the part of the digital controller where this information is stored.

Question 27

What are the basic types of controls being installed today to control large systems?

Question 28

List the types of driers often used to dry control air located in a storage tank..

Question 29

Thermostat has some small switches in the back that are called ____________________ switches that allow the technician to set this thermostat up for the particular piece of equipment that it is controlling.

Question 30

What are some of the features of a thermostat?

Question 31

List three temperatures that may be important when testing equipment.

Question 32

What are the advantages of using pneumatic controls?

Question 33

____________________ driers use some of the same products that refrigerant driers use, silica gel or molecular sieve as an adsorbent.

Question 34

In a home air-conditioning system, the ____________________ is the sensor.

Question 35

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