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adjusted alkaline battery ammeter applied armature armature coil bars battery blown fuses brush holders capacitor cause checked circuit breaker clean code letters commutator conductors connected contacts correct Correlated filmstrip d-c motor damage detected direct current Direct-current disconnect electrical apparatus Electrical Insulation electrolyte emergency repair equipment exciter frequency grease ground-detecting heat Hence illustrated in Fig incoming machine indicated induction motor insulation resistance lamp lead-acid battery load located maintenance megohmmeter megohms Merchant Marine Academy meter mica moisture National Electrical Code neutral ohmmeter operating overheating Overload parallel pointer polarity poles position power factor rated voltage relay removed residual magnetism resistor reversed rheostat rotation rotor series field short circuit shown in Fig shunt field single-phase slip rings solvent specific gravity squirrel-cage starter stator coils switch synchronous motor temperature terminals tester three-phase transformer trouble U.S. Merchant Marine USOE/UWF ventilating ducts voltage voltmeter volts volts volts volts winding wound-rotor zero