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WorksheetsETC 605
Total questions: 40
Worksheet time: 7hrs 40mins
__________ is a device for making and breaking the connection in an electric circuit.
switch
wire
Toggle are basically _________ in nature, that will change its contact when pressed and will NOT return back to its initial state upon release.
momentary
maintained
The contact of this switch is NORMALLY ______.
OPEN
CLOSE
The contact of this switch is NORMALLY ______.
OPEN
CLOSE
Identify this type of switch.
pushbutton
toggle
rocker
selector
Identify this type of switch.
pushbutton
toggle
limit
selector
Identify this type of switch.
float
toggle
limit
selector
Identify this type of switch.
float
pressure
temperature
selector
Identify this type of switch.
float
pressure
temperature
flow
Identify this type of switch.
float
pressure
temperature
flow
In the limit switch shown in the picture, identify the name of the part labeled with number 1?
operator
cover
switch case
internal switch
When the valve reaches the its desired position, what will be the position of the correctly set limit switch?
open
close
half open
half close
In limit switches, it is the distance or angle that the actuator must go through to trip the contacts.
pre travel
post travel
mid travel
operating point
A part of limit switch containing the electrical contact mechanism.
switch body
switch contact
lever
The component containing the terminal screws or screw/clamp assembly necessary for wiring purposes.
switch body
switch contact
lever
terminals
_________ limit switches are often chosen for their precise operating abilities, small size and low cost.
Precision
Large
Tiny
This type of switch is _____ pole, _____ throw.
double; double
double; single
single; double
single; single
Automatically operated switches can be operated by process variables such as flow, level, temperature and pressure.
TRUE
FALSE
Mercury switches are replaced by REED switches due to __________ hazards.
environmental
physical
ergonomics
The ________ refers to the number of complete circuits that can pass thru the circuit at one time.
pole
throw
terminals
The OPENING of contact in a switch is called ________.
break
make
half break
half make
The CLOSING of contact in a switch is called ________.
break
make
half break
half make
REED relay contacts are activated by external __________.
magnet
battery
chemicals
pressure
A _________ switch uses changes in level of a liquid to open and close the contact.
float
pressure
temperature
In a pressure switch, the ________ spring is used to set the differential values.
compression
tension
contact
Identify the following part of a pressure switch.
compression spring
tension spring
contact
_______ switch are used to convert mechanical motion into an electrical signal and limit the actions of the process.
limit
pressure
temperature
A rod level limit switch is also called ________.
wobble stick
joystick
keyboard
This type of switch is _____ pole, _____ throw.
double; double
double; single
single; double
single; single
This type of switch is _____ pole, _____ throw.
double; double
double; single
single; double
single; single
_________ switch is a manual switch that is used to reverse the rotation of motors.
drum
level
limit
Which of the following is NOT a type of interlocking.
auxilliary
mechanical
pushbutton
level
A __________ is a bank of normally close and normally open switches that are controlled by a single lever or handle.
joystick
wobble stick
What type of interlocking provides electrical isolation of the opposing energized coil?
auxilliary
mechanical
pushbutton
What type of limit switch actuator is used on limit switches with maintained contact switching?
rod lever
forked type
adjustable roller
Load that the switch can handle without making or breaking the load.
Continuous rating
Interrupting rating
overload rating
When a switch will make or break, an ________ will then occur across the contacts which will tend to heat and burn them.
arc
moisture
dust
________return limit switches have no spring return mechanism, it relies on its weight to return it to its free position
Gravity
REED
Magnetic
The position of the actuator at which the contacts return to their original state
Release point
Operating point
Differential point
Ability of a switch to repeat its characteristics precisely from one operation to the next operation
Repeat accuracy
travel return
operating force
