Opposites attract
this type of magnet is produced by the flow of electric current
Electromagnet
a turning or twisting force that causes an object to move
Torque
a device with a fusible link that melts and opens when an overcurrent exists
Fuse
A(n) ? condition causes the current to rise hundreds of times higher than normal at a very fast rate.
Short Circuit
Motors are found in the code book in article?
430
Sprinkler head locations can be found on this print.
RCP
What is the abbreviation for the power rating of a motor on the nameplate?
HP
current in a conductor creates a what around the conductor
Magnetic field
the rotating moving part of an alternator or generator or motor consisting of a core and windings
Rotor
a set of fuses or circuit breakers added to provide overcurrent protection of a switch circuit is called
Overcurrent protection device / OCPD
A __?____ is an unintentional connection between an ungrounded conductor and any grounded raceway, box, enclosure, or fitting.
Ground Fault
Overcurrent Protection is found in the code book in article?
240
The maximum amount of #10 AWG THHN wires that can be pulled in a 3/4" EMT is?
10
The ? rating of a motor is abbreviated Hz.
Frequency
an electromagnetic device that converts electrical energy into a linear mechanical force that moves a plunger within a coil
Solenoid
this type of motor is an induction motor with the squirrel cage conductor bars replaced with coils of wire and with added slippers brushes and a resistor circuit
wound rotor motor
a dual element fuse that can detect and remove a short circuit almost instantly but allows small overloads to exist for a short period of time
Time delay fuse/ TDF
A(n) ? condition causes the current to rise hundreds of times higher than normal at a very fast rate.
Short Circuit
This type of OCPD does not need to be maintained.
Fuses
A GFCI receptacle will trip at this current amount.
A motor's nameplate voltage rating is the ? voltage that should be connected to the motor for best operating performance.
Optimal
the ability of an inductor (coil) in one circuit to induce a voltage in another circuit or conductor is called what
Mutual Induction
This type of motor spins at the same speed as the magnetic field. It can also function as an alternator and is commonly used in electric vehicles.
Synchronous Motor
the maximum amount of current that can be safely applied to an ocpd while still maintaining its physical integrity when reacting to fault currents
Interruption rating
A(n) ? in a motor is caused by a load that exceeds the full-load rating of the motor.
Overload
During typical motor operation current will be highest during motor startup. This is called the ___?___ current?
Locked Rotor
The grounded conductor is this color.
Grey or White
How are motors designed to operate for unlimited periods marked on the nameplate?
Cont
when an AC source voltage rises and the magnetic field expands around conductors an opposing voltage is induced in the circuit
CEMF or counter electromotive force or back emf
this type of motor is an electric motor that uses the principles of mutual induction to develop current and torque in the rotor
Induction motor
this type of circuit breaker has a delay in time between the fault and when the CB operates. However, the larger the overload or fault, the faster the device operates.
Inverse-time circuit breaker/ ITCB
Which type of overload occurs when a motor draws much more current than its full-load current during startup?
Temporary Overload
The number of electrical degrees in one rotor revolution depends on the number of ? in the motor.
Poles
An extension ladder should be set up away from the wall at this ratio.
4:1
The actual voltage applied to a motor should be within plus or minus ? of the motor's nameplate rated voltage.
10%