EGR 450 Final Exam with Complete Solutions
Inventor of electrochemical relay
Joseph Henry
Who won the war on currents?
George Westinghouse
For safety, is it better to use 2 wire or 3 wire control?
3 wire
Invention of the PLC is commonly attribute to?
Richard Morley
What device handles the most current between a relay, solenoid, and contactor?
contactor
HP rated relay (high amp & power)
Form C contact has
both one normally open and one normally closed contact
Form B contact has
normally closed contacts
Form A contact has
normally open contacts
,Relay
has at least one set of contacts
symbol is circle with lines on either side
How it works: electromagnetic (coil and core), armature w contacts, spring (design dependent)
yoke (design dependent)
Solenoid
has a valve and a plunger and coil
symbol is zig zag with lines
ex. keycard door release, pneumatic/hydraulic valves
Diff between wiring diagrams and schematics
wiring diagrams show physical relationships
schematics show plan and function but not physical layout (more similar to ladder layout)
a PNP sensor is...
current sourcing
an NPN sensor is...
current sinking
, What sensors do NOT typically have hard/dry contacts?
relay outputs
inductive prox switch
capacitive switch
relay output module
What sensors typically have hard/dry contacts?
limit switch
What sensor (switch) type creates an electromagnetic field
inductive proximity
To trip a reed relay we would use a...
magnet
The inductive proximity sensors we use in lab are made by
Turck
IEC61131-3 Specified Programming Languages
Ladder diagrams
Instruction Lists
Sequential Function Charts
Structured Text
Function Block Diagram
3 Publications we subscribed to
Inventor of electrochemical relay
Joseph Henry
Who won the war on currents?
George Westinghouse
For safety, is it better to use 2 wire or 3 wire control?
3 wire
Invention of the PLC is commonly attribute to?
Richard Morley
What device handles the most current between a relay, solenoid, and contactor?
contactor
HP rated relay (high amp & power)
Form C contact has
both one normally open and one normally closed contact
Form B contact has
normally closed contacts
Form A contact has
normally open contacts
,Relay
has at least one set of contacts
symbol is circle with lines on either side
How it works: electromagnetic (coil and core), armature w contacts, spring (design dependent)
yoke (design dependent)
Solenoid
has a valve and a plunger and coil
symbol is zig zag with lines
ex. keycard door release, pneumatic/hydraulic valves
Diff between wiring diagrams and schematics
wiring diagrams show physical relationships
schematics show plan and function but not physical layout (more similar to ladder layout)
a PNP sensor is...
current sourcing
an NPN sensor is...
current sinking
, What sensors do NOT typically have hard/dry contacts?
relay outputs
inductive prox switch
capacitive switch
relay output module
What sensors typically have hard/dry contacts?
limit switch
What sensor (switch) type creates an electromagnetic field
inductive proximity
To trip a reed relay we would use a...
magnet
The inductive proximity sensors we use in lab are made by
Turck
IEC61131-3 Specified Programming Languages
Ladder diagrams
Instruction Lists
Sequential Function Charts
Structured Text
Function Block Diagram
3 Publications we subscribed to
