[ILM] 104A

Question 1

R->
G->
Y ->
W ->
C ->

Answer 1

main power
fan on/off - green
cooling - blue
heat - black
common - white

Question 2

1. open loop is
2. closed loop is

Answer 2

1. manual and has NO FEEDBACK
2. automatic and has feedback

Question 3

Internally powered

Answer 3

requires no power external to the system

Question 4

pneumatic

Answer 4

operates by means of air pressure that a compressor supplies

Question 5

electromechanical

Answer 5

operates by means of electricity and its components are connected by electrical wires

Question 6

electronic

Answer 6

operates by means of electricity, but uses electronic elements, such as trasistors

Question 7

hybrid

Answer 7

may contain components from any of the other categories and is also considered a power source-based system

Question 8

control system modes

Answer 8

1. on/off
2. multi-position
3. floating - (dead control zone)
4. proportional or modulating

Question 9

floating control

Answer 9

usually tri-state

1. switch 1 is ON; switch 2 is OFF
2. switch 1 is OFF; switch 2 is ON
3. switch 1 is OFF; switch 2 is OFF

switch 1 & 2 are NEVER ON at the same time

Question 10

proportional analog signal

Answer 10

0 to 10 vdc
2 to 10 vdc
4 to 20 maDC

Question 11

Proportional (P) contains

Answer 11

no signal conditioning or algorithm

Question 12

Proportional Integral (PI) contains

Answer 12

time algorithm

Question 13

Proportional Integral Derivative (PID) contains

Answer 13

time and temperature algorithms

Question 14

Miscommunication or inaccurate use or term causes

Answer 14

1. unnecessary costs
2. equipment damages
3. civil litigation
4. government intervention
5. bodily injury to equipment users

Question 15

the energy that the control system manipulates to cause a change in the controlled medium

Answer 15

control agent

Question 16

a movable plate within a vessel or chamber that starts, stops, or varies the volume of air entering, leaving, or passing through that vessel or chamger

Answer 16

damper

Question 17

a two position or on/off control system; non-variable

Answer 17

digital

Question 18

a control system that is continuously variable

Answer 18

analog

Question 19

direct acting

Answer 19

the output signal changes in the same direction that the controlled or measured variable changes
ex) an increase in resistance from an increase of temperature

Question 20

reverse acting

Answer 20

the output signal changes in the opposite direction to the controlled or measured variable changes
ex) an increase in the controlled or measured variable results in a decreased output signal

Question 21

low limit control

Answer 21

a device that normally monitors the condition of the controlled medium and interrupts system operation if the monitored condition drops below the desired minimum value

Question 22

Peltier effect

Answer 22

cooling seats

Question 23

resistance temperature detector (RTD)

Answer 23

a temp sensor that operates on changes in electrical resistance based on RTD temp changes

Question 24

thermocouple

Answer 24

a device for measuring temp whenever 2 junctions of 2 dissimilar metals in an electric circuit are at different temperatures

Question 25

thermistor

Answer 25

a heat sensitive resistor with a resistance change based on temp changes

Question 26

transducer

Answer 26

an electronic pressure sensor utilizing piezoelectric counter emf to create measurable impedance in a control loop

Question 27

electrical drawings

Answer 27

connection diagram
schematic diagram = ladder diagram

Question 28

important point of schematic diagram

Answer 28

every line diagram or rung MUST have at least one load