16

Question 1

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

Answer 1

Controlled output device

Question 2

Internal instructions stored in a microprocessor.

Answer 2

Algorithms

Question 3

Sensor is located upstream of the controlled medium.

Answer 3

Open control loop

Question 4

Sends information back to the controller in terms of resistance.

Answer 4

Passive sensors

Question 5

Information from sensors is converted from analog (modulating) to a digital (on/off)
Binary format

Answer 5

Signal converter

Question 6

Measures the change in conditions.

Answer 6

Sensors

Question 7

Sensor is located downstream in the controlled medium.

Answer 7

Closed control loop

Question 8

Part of the digital controller where information, rules and mathematical information
for controlling the system, are stored.

Answer 8

Memory

Question 9

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

Answer 9

Active sensors

Question 10

Bills the owner at the power rate for the month based on the highest usage for some
time span.

Answer 10

Demand metering

Question 11

Inputs to the controller are one of two opposing conditions such as yes/no or on/off.

Answer 11

Binary (digital)

Question 12

Have a range of inputs/values over any given time period. When the values are
displayed on a graph, the results are non-linear.

Answer 12

Analog

Question 13

The data route in a control loop that usually travels from the control medium’s sensor to the controller, then to the controlled device and back into the controlled process to the sensor again in the control point.

Answer 13

Feedback loop

Question 14

Conditioned space

Answer 14

Controlled environment

Question 15

Sensor placed in the controlled environment or upstream of the controlled environment. The actual value of the controlled variable at a particular point in time.

Answer 15

Control point

Question 16

Term used to describe the sensitivity of a control.

Answer 16

Gain

Question 17

Passive sensors are limited in how far they can be located from the controller because of the resistance of the wire connecting the sensor to the controller. T/F

Answer 17

T

Question 18

The controlled device measures the change in conditions. T/F

Answer 18

F

Question 19

The downside of using a local water supply and coil to dry air used in a pneumatic control system is that the water supply may not be cold enough to remove the correct amount of water from the air. T/F

Answer 19

T

Question 20

The speed of a motor can be determined by how many poles a motor has. The
more poles, the slower the speed. T/F

Answer 20

T

Question 21

Examples of digital inputs are temperature, pressure humidity flow and light. T/F

Answer 21

F

Question 22

If the controlled output device is digital, the signal converter will convert analog
data to digital data. T/F

Answer 22

T

Question 23

Pneumatic controls may be used to switch electrical circuits or electrical circuits
may be used to switch pneumatic control circuits on/off. T/F

Answer 23

T

Question 24

The sensor is the device that responds to data output from the controller. T/F

Answer 24

F

Question 25

The sensor and controller are often in the same device. T/F

Answer 25

T

Question 26

In an open control loop, all changes happen within the loop. T/F

Answer 26

T

Question 27

Space temperature is the only temperature that is important in modern systems. T/F

Answer 27

F

Question 29

The low voltage control wires are installed at the factory. T/F

Answer 29

F