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Volume 2 - On-Site Power Flashcards

Generators

1
Q

What type of corrosion is known to be the most common and destructive and occurs when two different types of metal contact each other with moisture present?

Lesson 1 General Tasks (M2L1)

A

Galvanic

M2L1T1 - Principles of Corrosion Control (5.1)

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2
Q

Which is a temporary protection of painted or unpainted surfaces where the coating system has been damaged or removed?

Lesson 1 General Tasks (M2L1)

A

Compound

M2L1T1 - Principles of Corrosion Control (5.1)

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3
Q

Which mechanical removal type uses abrasive paper to remove light corrosion not deeply pitted into metal?

Lesson 1 General Tasks (M2L1)

A

Sanding

M2L1T1 - Principles of Corrosion Control (5.1)

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4
Q

Which common cleaning removal type combines mechanical force from spray with the reactions of the chemicals used in the solutions?

Lesson 1 General Tasks (M2L1)

A

Spray washing

M2L1T1 - Principles of Corrosion Control (5.1)

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5
Q

What is the purpose of installing engine pre-heating devices?

Lesson 1 General Tasks (M2L1)

A

To prevent damage caused by cold starts and rapid acceleration to rated RPM.

M2L1T2 - Types of Engine Pre-Heating Devices (5.2)

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6
Q

What is a weakness of the Direct Immersion (Coolant Type) pre-heating device?

Lesson 1 General Tasks (M2L1)

A

Heat loss over distances creates cold pockets.

M2L1T2 - Types of Engine Pre-Heating Devices (5.2)

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7
Q

Which method of coolant pre-heating functions strictly operates off on-board battery voltage?

Lesson 1 General Tasks (M2L1)

A

Fuel-fired

M2L1T2 - Types of Engine Pre-Heating Devices (5.2)

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8
Q

Which method of air pre-heating functions strictly operates off on-board batter voltage?

Lesson 1 General Tasks (M2L1)

A

Glow plugs

M2L1T2 - Types of Engine Pre-Heating Devices (5.2)

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9
Q

Which component is used to set the required charging profile depending on the battery type?

Lesson 1 General Tasks (M2L1)

A

Charging Quick Set Selector

M2L1T3 - Battery Charger Components and Theory of Operation (5.4.1)

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10
Q

Which component allows the user to select the battery pre-charge status?

Lesson 1 General Tasks (M2L1)

A

Maintainer Quick Set Selector

M2L1T3 - Battery Charger Components and Theory of Operation (5.4.1)

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11
Q

What will occur after connecting the charger and not making a charging quick set selection within 10 minutes?

Lesson 1 General Tasks (M2L1)

A

Will default to a safe maintainer mode.

M2L1T3 - Battery Charger Components and Theory of Operation (5.4.1)

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12
Q

After the battery has completed charging, the batter charger will enter which mode of operation?

Lesson 1 General Tasks (M2L1)

A

Conditioning Battery Mode

M2L1T3 - Battery Charger Components and Theory of Operation (5.4.1)

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13
Q

When the piston begins to travel downward in the cylinder, what occurs?

Lesson 2 Engine Fundamentals

A

Creates a vacuum.

M2L2T1 - Components and Theory of Operation of a Gasoline Engine (8.1.1)

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14
Q

When fuel is mixed with air and ignited by an electric spark from the ignition system, what occurs?

Lesson 2 Engine Fundamentals

A

Combustion

M2L2T1 - Components and Theory of Operation of a Gasoline Engine (8.1.1)

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15
Q

What is the purpose of the flywheel?

Lesson 2 Engine Fundamentals

A

Stores rotational energy to ensure rotation of the crankshaft.

M2L2T1 - Components and Theory of Operation of a Gasoline Engine (8.1.1)

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16
Q

If the piston reaches its upper limit of travel, what is it called?

Lesson 2 Engine Fundamentals

A

Top Dead Center.

M2L2T1 - Components and Theory of Operation of a Gasoline Engine (8.1.1)

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17
Q

How many complete revolutions of the crankshaft are required for a two-stroke engine?

Lesson 2 Engine Fundamentals

A

One

M2L2T2 - Two Stroke Engine (8.2.1.1)

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18
Q

What type of valves are located in the overhead valve train of a two-stroke diesel engine?

Lesson 2 Engine Fundamentals

A

Exhaust

M2L2T2 - Two Stroke Engine (8.2.1.1)

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19
Q

What supplies fresh air to the air box in a two-stroke diesel engine?

Lesson 2 Engine Fundamentals

A

Blower

M2L2T2 - Two Stroke Engine (8.2.1.1)

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20
Q

When does the intake event begin on a two-stroke diesel engine?

Lesson 2 Engine Fundamentals

A

When the piston uncovers the intake ports.

M2L2T2 - Two Stroke Engine (8.2.1.1)

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21
Q

If coolant comes into direct contact with the cylinder liner, then what type of liner is used?

Lesson 2 Engine Fundamentals

A

A wet liner.

M2L2T3 - Four Stroke Diesel Engines (8.2.1.2)

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22
Q

If the cylinder head forms the top of the combustion chamber, then what component forms the bottom of the combustion chamber?

Lesson 2 Engine Fundamentals

A

The piston.

M2L2T3 - Four Stroke Diesel Engines (8.2.1.2)

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23
Q

What is the purpose of a four-stroke diesel engine?

Lesson 2 Engine Fundamentals

A

Convert the chemical energy of burning fuel into the mechanical energy of an engine.

M2L2T3 - Four Stroke Diesel Engines (8.2.1.2)

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24
Q

Which of the following is a major advantage of a diesel engine over gaseous engines?

Lesson 2 Engine Fundamentals

A

Fuel efficiency

M2L2T3 - Four Stroke Diesel Engines (8.2.1.2)

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25
Seals are comprised of what? ## Footnote Lesson 2 Engine Fundamentals
High grade flexible rubber compounds. ## Footnote M2L2T4 - Replace Engine Seals and Gaskets (8.2.4.6)
26
What should be done to prevent cross threading? ## Footnote Lesson 2 Engine Fundamentals
Start all fasteners by hand before tightening with tools. ## Footnote M2L2T4 - Replace Engine Seals and Gaskets (8.2.4.6)
27
What is the purpose of a gasket? ## Footnote Lesson 2 Engine Fundamentals
Provides a mechanical seal between non-rotating parts. ## Footnote M2L2T4 - Replace Engine Seals and Gaskets (8.2.4.6)
28
When should gasket sealant be used? ## Footnote Lesson 2 Engine Fundamentals
Only as directed. ## Footnote M2L2T4 - Replace Engine Seals and Gaskets (8.2.4.6)
29
Which of these will cause a loss of coolant? ## Footnote Lesson 2 Engine Fundamentals
Faulty radiator cap. ## Footnote M2L2T5 - Gasoline Engine Malfunctions (8.1.2)
30
If a gasoline engine lubricating system is showing low oil pressure, which will NOT be the cause? ## Footnote Lesson 2 Engine Fundamentals
Low level of urea. ## Footnote M2L2T5 - Gasoline Engine Malfunctions (8.1.2)
31
What is a common cause of high temperature coolant system malfunction? ## Footnote Lesson 2 Engine Fundamentals
Thermostat stuck closed. ## Footnote M2L2T5 - Gasoline Engine Malfunctions (8.1.2)
32
In a gasoline engine, what would cause a lower power output in relation to the intake and exhaust system? ## Footnote Lesson 2 Engine Fundamentals
Restricted intake or silencer. ## Footnote M2L2T5 - Gasoline Engine Malfunctions (8.1.2)
33
What is one cause of air in the fuel lines? ## Footnote Lesson 2 Engine Fundamentals
Running out of fuel ## Footnote M2L2T6 - Diesel Engine Malfunctions (8.2.2)
34
What can “knock”? ## Footnote Lesson 2 Engine Fundamentals
Over advanced time of the injector ## Footnote M2L2T6 - Diesel Engine Malfunctions (8.2.2)
35
What will cause a generator to wet stack? ## Footnote Lesson 2 Engine Fundamentals
Insufficient load ## Footnote M2L2T6 - Diesel Engine Malfunctions (8.2.2)
36
EPA standards may require what to be used? ## Footnote Lesson 2 Engine Fundamentals
Diesel exhaust fluid ## Footnote M2L2T6 - Diesel Engine Malfunctions (8.2.2)
37
What component moves oil from the oil pan and delivers it throughout the engine? ## Footnote Lesson 3 Engine Lubrication System
Oil Pump ## Footnote M2L3T1 - Engine Lubrication System Components & Theory of Operations (10.1)
38
What is the purpose of an oil filter? ## Footnote Lesson 3 Engine Lubrication System
To remove unwanted contaminates. ## Footnote M2L3T1 - Engine Lubrication System Components & Theory of Operations (10.1)
39
What is the purpose of the oil cooler? ## Footnote Lesson 3 Engine Lubrication System
To remove excess heat from oil to help retain the lubricating qualities of the oil. ## Footnote M2L3T1 - Engine Lubrication System Components & Theory of Operations (10.1)
40
Which component stabilizes oil pressure at all speeds? ## Footnote Lesson 3 Engine Lubrication System
Oil Pressure Relief Valve ## Footnote M2L3T1 - Engine Lubrication System Components & Theory of Operations (10.1)
41
What component will be used to air in a cold engine start? ## Footnote Lesson 4 Engine Fuel System
Choke ## Footnote M2L4T1 - Gas Fuel System Components and Theory of Operation (11.1.1)
42
Which of these does NOT provide a form of fuel filtration? ## Footnote Lesson 4 Engine Fuel System
Reverse-osmosis ## Footnote M2L4T1 - Gas Fuel System Components and Theory of Operation (11.1.1)
43
When would a fuel transfer pump be used? ## Footnote Lesson 4 Engine Fuel System
When gravity feed will not be possible or practical. ## Footnote M2L4T1 - Gas Fuel System Components and Theory of Operation (11.1.1)
44
What is the function of the intake valves? ## Footnote Lesson 4 Engine Fuel System
To control the entry of the air/fuel mixture into the combustion chambers. ## Footnote M2L4T1 - Gas Fuel System Components and Theory of Operation (11.1.1)
45
What function of the fuel system breaks up the fuel into smaller particles? ## Footnote Lesson 4 Engine Fuel System
Atomization ## Footnote M2L4T2 - Diesel Fuel System Components and Theory of Operation (11.2.1)
46
Which type of fuel lines are standard wire-braided hose with an inner lining? ## Footnote Lesson 4 Engine Fuel System
Medium weight lines ## Footnote M2L4T2 - Diesel Fuel System Components and Theory of Operation (11.2.1)
47
Which fuel injection system is designed for applications with relatively broad speed requirements? ## Footnote Lesson 4 Engine Fuel System
Distribution Fuel System ## Footnote M2L4T2 - Diesel Fuel System Components and Theory of Operation (11.2.1)
48
A mechanical fuel pump is actuated by what? ## Footnote Lesson 4 Engine Fuel System
Camshaft ## Footnote M2L4T2 - Diesel Fuel System Components and Theory of Operation (11.2.1)
49
What happens to air velocity when it passes over the fins of air-cooled engines? ## Footnote Lesson 5 Engine Cooling System
Slows down. ## Footnote M2L5T1 - Coolant System Components and Theory of Operations (12.1)
50
The centrifugal water pump draws coolant into the center of the impeller and then? ## Footnote Lesson 5 Engine Cooling System
Throws coolant at high velocity into the surround casing. ## Footnote M2L5T1 - Coolant System Components and Theory of Operations (12.1)
51
What is the purpose of the additive within the coolant filters? ## Footnote Lesson 5 Engine Cooling System
To condition the coolant to minimize scale build up. ## Footnote M2L5T1 - Coolant System Components and Theory of Operations (12.1)
52
When the pressure in the cooling system exceeds the maximum valve pressure, the radiator cap? ## Footnote Lesson 5 Engine Cooling System
Diverts coolant to the expansion tank. ## Footnote M2L5T1 - Coolant System Components and Theory of Operations (12.1)
53
If left untreated, cavitation can cause what in a cooling system? ## Footnote Lesson 5 Engine Cooling System
Pinholes in the liner allowing coolant to leak through. ## Footnote M2L5T2 - Coolant Additives (12.7)
54
Supplement coolant additives are water-soluble chemical compounds that protect metal surfaces of the cooling system against? ## Footnote Lesson 5 Engine Cooling System
Damage and corrosion. ## Footnote M2L5T2 - Coolant Additives (12.7)
55
Conventional antifreezes use what type of additives to achieve corrosion and scale protection? ## Footnote Lesson 5 Engine Cooling System
Inorganic ## Footnote M2L5T2 - Coolant Additives (12.7)
56
What is used to determine if the correct amount of coolant additives exist within the cooling system? ## Footnote Lesson 5 Engine Cooling System
Test strips ## Footnote M2L5T2 - Coolant Additives (12.7)
57
What air cleaner has air travel through two filters before entering the intake piping? ## Footnote Lesson 6 Engine Intake and Exhaust System
Two-stage cleaner ## Footnote M2L6T1 - Intake and Exhaust Components and Theory of Operations (14.1)
58
If cooling air passes over intake air, then this is a/an? ## Footnote Lesson 6 Engine Intake and Exhaust System
Air-to-air aftercooler ## Footnote M2L6T1 - Intake and Exhaust Components and Theory of Operations (14.1)
59
What type of silencer is efficient at mitigating low to mid frequency noise only? ## Footnote Lesson 6 Engine Intake and Exhaust System
Reactive ## Footnote M2L6T1 - Intake and Exhaust Components and Theory of Operations (14.1)
60
What is the end product if DEF is used in conjunction with an SCR Catalyst in a diesel exhaust system? ## Footnote Lesson 6 Engine Intake and Exhaust System
Nitrogen and water ## Footnote M2L6T1 - Intake and Exhaust Components and Theory of Operations (14.1)
61
In order for the engine control unit to understand a sensor signal it must first be converted into? ## Footnote Lesson 7 Engine Governing System
Digital ## Footnote M2L7T1 - Electronic Governors (13.1.1)
62
Which of the following functions of an electronic governing system comes after sensing? ## Footnote Lesson 7 Engine Governing System
Computing ## Footnote M2L7T1 - Electronic Governors (13.1.1)
63
Why are electronic governors used instead of mechanical? ## Footnote Lesson 7 Engine Governing System
Easier to tune and change preselected speeds. ## Footnote M2L7T1 - Electronic Governors (13.1.1)
64
In order to supply a utility with a certain amount of power, the ECU must be set to what? ## Footnote Lesson 7 Engine Governing System
Droop Base Load ## Footnote M2L7T1 - Electronic Governors (13.1.1)
65
What capability does the battery have? ## Footnote Lesson 8 Engine DC Electrical
Stores chemical energy and converts it into electrical energy. ## Footnote M2L8T1 - DC Electrical System Components and Theory of Operation (9.1)
66
Which component of the Starting System uses low amperage to operate a high amperage component? ## Footnote Lesson 8 Engine DC Electrical
The start switch and crank relay ## Footnote M2L8T1 - DC Electrical System Components and Theory of Operation (9.1)
67
Which component engages the pinion gear? ## Footnote Lesson 8 Engine DC Electrical
Starter solenoid ## Footnote M2L8T1 - DC Electrical System Components and Theory of Operation (9.1)
68
The MPU, crank positioning sensor and the cam positioning sensor all perform what function? ## Footnote Lesson 8 Engine DC Electrical
Sense the engine speed during startup ## Footnote M2L8T1 - DC Electrical System Components and Theory of Operation (9.1)
69
What is the purpose of a battery? ## Footnote Lesson 8 Engine DC Electrical
Store chemical energy and convert it into electrical energy when connected to a load. ## Footnote M2L8T2 - Types of Batteries (9.5.1)
70
What is used as an electrolyte solution in a lead-acid batter? ## Footnote Lesson 8 Engine DC Electrical
A mixture of water and sulfuric acid ## Footnote M2L8T2 - Types of Batteries (9.5.1)
71
Specific gravity is affected by what two things? ## Footnote Lesson 8 Engine DC Electrical
State of charge and temperature ## Footnote M2L8T2 - Types of Batteries (9.5.1)
72
Which type of battery is constructed of fine, highly porous, micro-fiber glass separators to absorb the electrolyte? ## Footnote Lesson 8 Engine DC Electrical
Absorbed Glass Mat ## Footnote M2L8T2 - Types of Batteries (9.5.1)
73
When would static ground be utilized? ## Footnote Lesson 9 Grounding Fundamentals
While offloading fuel into a storage tank. ## Footnote M2L9T1 - Types of Grounds (7.1)
74
Why are static grounds used? ## Footnote Lesson 9 Grounding Fundamentals
To prevent static electricity from reaching sparking potential. ## Footnote M2L9T1 - Types of Grounds (7.1)
75
Which type of grounding radiates wires horizontally from a central point? ## Footnote Lesson 9 Grounding Fundamentals
Star Grounds ## Footnote M2L9T1 - Types of Grounds (7.1)
76
Which of the following is best example of an equipment ground? ## Footnote Lesson 9 Grounding Fundamentals
Driven electrodes with a resistance value of 5 Ohms. ## Footnote M2L9T1 - Types of Grounds (7.1)
77
Why are electrical systems and equipment grounded? ## Footnote Lesson 9 Grounding Fundamentals
Protect personnel, equipment and facility cabling. ## Footnote M2L9T2 - Principles of Grounding (7.2)
78
Electrical systems are grounded to prevent surges due to _____, line surges and unintentional contact with higher voltage lines? ## Footnote Lesson 9 Grounding Fundamentals
Lightning ## Footnote M2L9T2 - Principles of Grounding (7.2)
79
For a system to be considered grounded, it must? ## Footnote Lesson 9 Grounding Fundamentals
Have at least one conductor or point intentionally grounded. ## Footnote M2L9T2 - Principles of Grounding (7.2)
80
Which grounding principles is defined below? Protects personnel from shock, electrocution, fire and explosion hazards by equalizing the potential between ground and any normally non-current carrying conductive materials. ## Footnote Lesson 9 Grounding Fundamentals
Personal and Equipment Safety ## Footnote M2L9T2 - Principles of Grounding (7.2)
81
What boding method is used to connect components separated by distance and can be solid, stranded, braided, bare or insulated? ## Footnote Lesson 9 Grounding Fundamentals
Jumper Wire ## Footnote M2L9T3 - Bonding (7.6)
82
Which of the following is NOT a reason for bonding equipment? ## Footnote Lesson 9 Grounding Fundamentals
Provide alternate current carrying conductor. ## Footnote M2L9T3 - Bonding (7.6)
83
When bonding electrical system components, which of the following methods is appropriate? ## Footnote Lesson 9 Grounding Fundamentals
Exothermic welding ## Footnote M2L9T3 - Bonding (7.6)
84
What bonding method utilizes rigid plates that can be used to span a gap to connect two or more components of an electrical system? ## Footnote Lesson 9 Grounding Fundamentals
Terminal bars ## Footnote M2L9T3 - Bonding (7.6)
85
Which alternator component(s) help(s) to maintain stable voltage during load changes? ## Footnote Lesson 10 AC Generating System
Damper Windings ## Footnote M2L10T1 - Alternators (15.1.1)
86
Which alternator connection has three phase leads and a neutral? ## Footnote Lesson 10 AC Generating System
WYE ## Footnote M2L10T1 - Alternators (15.1.1)
87
What exciter component rotates and provides AC voltage to the rectifier components? ## Footnote Lesson 10 AC Generating System
Exciter Armature ## Footnote M2L10T1 - Alternators (15.1.1)
88
How many degrees apart is each phase winding in a three-phase alternation positioned? ## Footnote Lesson 10 AC Generating System
120 degrees ## Footnote M2L10T1 - Alternators (15.1.1)
89
If voltage output goes to zero, what will happen to the voltmeter? ## Footnote Lesson 10 AC Generating System
The power to the meter will also go to zero and read 0 VAC. ## Footnote M2L10T2 - AC Generating System Controls (15.3.1)
90
If a transformer uses two inductors, then it is said to be what kind of transformer? ## Footnote Lesson 10 AC Generating System
Potential transformer ## Footnote M2L10T2 - AC Generating System Controls (15.3.1)
91
If the Power Factor meter indicates to the left, then the load is _____, and is said to be _____. ## Footnote Lesson 10 AC Generating System
Lagging, inductive. ## Footnote M2L10T2 - AC Generating System Controls (15.3.1)
92
If the Automatic Voltage Regulator computed a positive error signal, then how would that affect the stator’s output voltage? ## Footnote Lesson 10 AC Generating System
The voltage would decrease. ## Footnote M2L10T2 - AC Generating System Controls (15.3.1)
93
Which type of protective device provides a time delay and must be replaced when actuated? ## Footnote Lesson 10 AC Generating System
Fuse ## Footnote M2L10T3 - Protective Devices (15.4.1)
94
If a circuit has higher amperage or volt ratings, then what type of fuse will be used? ## Footnote Lesson 10 AC Generating System
Catridge ## Footnote M2L10T3 - Protective Devices (15.4.1)
95
If current rises above the amperage rating on a fuse link, what will happen? ## Footnote Lesson 10 AC Generating System
Heat from passing current melts the fuse link. ## Footnote M2L10T3 - Protective Devices (15.4.1)
96
Why would a piece of equipment be equipped with a thermal-magnetic circuit breaker? ## Footnote Lesson 10 AC Generating System
The breaker is capable of handling larger overloads. ## Footnote M2L10T3 - Protective Devices (15.4.1)
97
The Air Force Form 487 (Generator Operating Log) is used to? ## Footnote Lesson 11 Real Property Installed Equipment (Generators)
Record operating data, the condition of engine/generator systems, discrepancies, corrective actions taken and to determine the need for maintenance. ## Footnote M2L11T1 - Real Property Installed Equipment (N/A)
98
Upon starting the engine, check for excessive smoke. Why? ## Footnote Lesson 11 Real Property Installed Equipment (Generators)
Because this is indicative of malfunctions in either the fuel or intake system. ## Footnote M2L11T1 - Real Property Installed Equipment (N/A)
99
If possible, why should an infrared scan of inner equipment be accomplished on an AC system? ## Footnote Lesson 11 Real Property Installed Equipment (Generators)
To detect loose connections, imbalanced circuits, damaged switches, and material defects unseen by the naked eye. ## Footnote M2L11T1 - Real Property Installed Equipment (N/A)
100
If facility loads are not sufficient in bringing the generator to the required load level, then what should be done? ## Footnote Lesson 11 Real Property Installed Equipment (Generators)
Augment with a load bank to comply with regulations and requirements. ## Footnote M2L11T1 - Real Property Installed Equipment (N/A)
101
Which component moves the contact assemblies between Source 1 and Source 2? ## Footnote Lesson 12 Automatic Transfer Switches
Linear Actuator ## Footnote M2L12T1 - Components and Theory of Operations of Automatic Transfer Switches (17.1)
102
How long is the Time Delay Normal to Emergency (TDNE) adjustable for? ## Footnote Lesson 12 Automatic Transfer Switches
0 to 120 seconds ## Footnote M2L12T1 - Components and Theory of Operations of Automatic Transfer Switches (17.1)
103
Which component houses a microprocessor that controls all ATS functions? ## Footnote Lesson 12 Automatic Transfer Switches
Digital Control Board ## Footnote M2L12T1 - Components and Theory of Operations of Automatic Transfer Switches (17.1)
104
Which ATS command is used to start the generator? ## Footnote Lesson 12 Automatic Transfer Switches
TDES ## Footnote M2L12T1 - Components and Theory of Operations of Automatic Transfer Switches (17.1)
105
What will happen if the generator’s voltage is incompatible with the electrical service? ## Footnote Lesson 12 Automatic Transfer Switches
Equipment will burn up or operate incorrectly. ## Footnote M2L12T2 - Compatibility Between Transfer Switch, Generator, and Electrical Service (17.8)
106
Which of the following does NOT need to be known to complete a load survey? ## Footnote Lesson 12 Automatic Transfer Switches
Open transition or closed transition. ## Footnote M2L12T2 - Compatibility Between Transfer Switch, Generator, and Electrical Service (17.8)
107
Why must the transfer switch have a switched neutral? ## Footnote Lesson 12 Automatic Transfer Switches
To protect the generator from ground faults occurring on the utility. ## Footnote M2L12T2 - Compatibility Between Transfer Switch, Generator, and Electrical Service (17.8)
108
In order for the facility load to operate properly, the generator and transfer switch must do what? ## Footnote Lesson 12 Automatic Transfer Switches
Provide the same number of phases as the electrical service. ## Footnote M2L12T2 - Compatibility Between Transfer Switch, Generator, and Electrical Service (17.8)
109
What are PLC’s replacing? ## Footnote Lesson 12 Automatic Transfer Switches
Electromechanical relays ## Footnote M2L12T3 - Programmable Logic Controllers: Components and Theory of Operation (17.10)
110
How is power supplied to single unit PLC’s? ## Footnote Lesson 12 Automatic Transfer Switches
Internally ## Footnote M2L12T3 - Programmable Logic Controllers: Components and Theory of Operation (17.10)
111
What hosts the PLC logic, memory and communications? ## Footnote Lesson 12 Automatic Transfer Switches
Central Processing Unit ## Footnote M2L12T3 - Programmable Logic Controllers: Components and Theory of Operation (17.10)
112
What was invented to ease the transition for technicians programming PLC’s, while they replaced mechanical relay logic systems? ## Footnote Lesson 12 Automatic Transfer Switches
Ladder Logic ## Footnote M2L12T3 - Programmable Logic Controllers: Components and Theory of Operation (17.10)

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