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Midterm Units 13-20 > Unit 16 > Flashcards

Unit 16 Flashcards

1
Q

What are the three basic components that make up a control loop?

A

Sensor, controller and control device

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2
Q

What is the difference between a close loop and an open loop system?

A

Open: inputs are before the controller
Close: inputs are after the controller, and Kenmore accurately adjusted changes made at the controller

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3
Q

Active sensor and information back to the controller in terms of _______ or _______.

A

Mili-amps or volts

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4
Q

Determine if the device is a controller, control, device, or sensor

Damper

A

Controlled device

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5
Q

Determine if the device is a controller, control, device, or sensor

Thermistor

A

Sensor

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6
Q

Determine if the device is a controller, control, device, or sensor

Valves

A

Controlled device

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7
Q

Determine if the device is a controller, control, device, or sensor

Thermostat

A

Controller

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8
Q

Determine if the device is a controller, control, device, or sensor

Humidistat

A

Sensor

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9
Q

Determine if the device is a controller, control, device, or sensor

Variable speed motor

A

Controlled device

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10
Q

Determine if the device is a controller, control, device, or sensor

Proportional Integral Derivative

A

Controller

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11
Q

Determine if the device is a controller, control, device, or sensor

Anemometer

A

Sensor

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12
Q

A passive sensor sent information back to the controller in terms of ________.

A

Resistance

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13
Q

The section on/inside the controller allows the microprocessor or digital controller to read the incoming data 

A

Signal converter

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14
Q

Give two examples of a binary (digital) input

A

-High pressure switch and low pressure switch
-on or off
-left or right

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15
Q

T/F
The more poles a motor has the faster, the speed of the motor

A

False

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16
Q

T/F
The control device’s location determines if the control loop is open or closed

A

False

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17
Q

T/F
The small switches in the back of a thermostat are called dual in-line pair 

A

True

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18
Q

T/F
Pneumatic controls can be used to switch electrical circuits

A

True

19
Q

T/F
Control loops can only maintain one sensor input. If a room needs light intensity, temperature and humidity controlled, three control loops are required. 

A

True

20
Q

T/F
Space temperature is not the only temperature that is important in modern systems 

A

True

21
Q

What are four other temperatures that may be used to make an air-conditioning system operate, more efficiently and economical?

A

-Ambient temp
-Indoor temp
-Supply air temp
-Return air temp
-Motor winding temp
-Discharge line temp
-Suction line temp

22
Q

Questions 22-33
Use the diagram to picture an open or close loop system. Be able to place sensors in the right location to make them open or closed loop.

A
23
Q

The internal instructions on a control board are stored in the _________.

A

Central processing unit

24
Q

Draw a ladder diagram showing a thermostat closing on the rise to pass power to a control, relay and liquid line solenoid that are wired in parallel. System power is 120 V.

A
25
Q

What are two types of dryers used to remove moisture from the air used in a pneumatic control system? 

A

-refrigerated air drier
-inline desiccant filter drier

26
Q

How much change in output per degree of temperature change

A

Sensitivity

27
Q

Reduce electrical power consumption by shutting down or reducing use of equipment during slow periods

A

Load shed

28
Q

Controls that use solid-state semi conductors for electrical and electronic functions

A

Electronic control

29
Q

Consist of sensor, controller and controlled

A

Control loop

30
Q

Controlling the flow between maximum or no flow

A

Modulating flow

31
Q

A continuous signal with an infinite number of step

A

Analog signal

32
Q

Air used as a control

A

Pneumatic control

33
Q

Sensitivity of a Control, such as how much change in output signal per degree of temperature

A

Gain

34
Q

Electronic control that operates on very low voltages

A

DDC

35
Q

Load shedding or duty cycling to lower electrical power costs

A

Energy management

36
Q

Used to control large volume of air that must be used to operate large pneumatic devices

A

Pilot positioner

37
Q

Codes that read out on an electrical panel that tells technician what the problem is

A

Error codes

38
Q

Start up of a building AC or heating system whereby the system is started up earlier and allowed to run at reduced capacity for the purpose of recording a low demand metering for the billing period

A

Smart recovery

39
Q

Modulating flow means ______.
A, B, C, D multiple choice

A

Variable

40
Q

Is it normal to hear a hissing sound when walking by a pneumatic thermostat?

A

Yes. Although a constant loud hissing could mean an air leakage which will need to be addressed. 

41
Q

Temperature, pressure, flow, light and humidity are all examples of _______ inputs

A

Analog

42
Q

Convert 60°C to Fahrenheit

A

140°F


43
Q

Be able to draw ladder diagrams for given circuits (two different diagram examples)

A

Midterm Units 13-20 (2 decks)

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