Unit 20 Quiz Flashcards
Made of very hard steel. Used to secure the assembly to the motor shaft.
Keyway
Broken motor winding indicated by “OL” when checked with an ohmmeter.
Open Winding
When a 3-phase motor is trying to run on two power leads.
Single phasing
Tool used to remove a pulley from a shaft.
Pulley puller
Windings touch each other where the insulation is worn.
Winding short circuit
Combining of a material with oxygen to form a different substance which results in the deterioration of the original substance. Acts as electrical resistance.
Oxidation
Used to check the condition of wire insulation and oil within a motor or compressor.
Megohmmeter
Shuts the furnace or boiler down when temperature in the furnace becomes excessive.
High limit control
Provides a better bond between the motor and whatever assembly is attached to the shaft.
Set screw
Strain on the drive mechanism shaft bearings and/or the driven shaft bearings can be prevented by doing this procedure.
Pulley alignment
Short circuit from motor winding to the frame of the motor.
Winding to ground short circuit
The proper connection between electrical installation systems via a conductor to the buried plate/rod in the earth.
Ground/earth
How should a capacitor be properly discharged according to chapter 20?
By shorting one terminal to the other with a 20,000 ohms, 5 watt Resistor.
What is the minimum information required for setting belt tension?
Belt size, drive/driven pulley diameters.
When testing a run capacitor under load, measure the amperage reading between the _________.
Capacitor and start winding terminal.