DC
What type of DC motor is best for desirable speed control?
Shunt Motor
What needs to be energized in order for a relay to take its contact states from "normal" to "energized" states?
The Coil
How would one reverse rotation of a 3-phase motor?
Switch two of the three leads.
A float/level switch measures what?
Level of liquid
What is the most common type of lamp today?
LED
What type of DC motor should be used for large amounts of torque as well as desirable speed control?
Compound DC Motor
What would be the cause of a relay failing to drop out?
The coil is still energized
What is the most common type of 3-phase induction motor?
Squirrel Cage
PSI
What is the fixture type called when hanging from the ceiling?
The part of a DC motor that makes electrical contact with the commutator to provide continuous voltage is the?
Brushes
What a relay coil is energized, the movable contacts move based on the principal of?
Electromagnetism
What type of 3-phase induction motor is best for frequent start/stops?
Wound-rotor motor
What flow switch measures what before switching states?
Gallons per m/s
What type of lighting fixture is behind a wall/ceiling?
Recessed
Large DC motors require that a starting _____ be placed in series with the motor armature.
Resistance
The enclosure for a low-voltage switching system in a residential installation should be
Readily accessible but hidden from sight
In an induction motor, what percentage does the rotor lag synchronicity?
10%
What switch is used to open/close a circuit for a blower motor in a freezer?
Temperature switch
What is a lamps brightness measure in?
Lumens
When starting a DC series motor, how much greater is the torque upon start up?
500%
What is the purpose of a shading coil in a contactor?
To prevent chatter and hum
What type of motor is used when we need synchronicity from no load to full load applications?
A switch that is said to allow current through when not energized is said to be?
Normally Closed