Jeppensen Chapter 7 Section A part 3 Flashcards
If one lead from each winding of a three-phase alternator is connected to a common point, the stator is __________ connected and if the phases are connected end-to-end the stator is __________ connected.
Y,
delta
Modern jet aircraft typically use an __________ cooled__________ alternator.
air,
brushless
On jet aircraft a ____________________ ____________________ ____________________ unit is
used between the engine and the alternator to assure a constant frequency output.
constant speed drive
Alternators used on large aircraft generally supply __________ hertz, __________ phase alternating current.
400,
3
The most commonly used aircraft batteries are the __________-__________ battery and the __________-__________ battery.
lead-acid,
nickel-cadmium
The state of charge of a lead acid battery is determined by measuring the __________ __________ of the electrolyte.
specific gravity
The specific gravity of a fully charged lead-acid battery should be between __________ and __________ at 80 deg. Fahrenheit (27°C).
1.275,
1.300
The specific gravity of a discharged lead-acid battery is about __________.
1.150
The specific gravity of a lead-acid battery is checked with a __________.
hydrometer
The open circuit voltage of a lead-acid cell is approximately __________ volts.
2.1
Battery capacity is measured in __________-__________.
ampere-hours
The standard rating used to specify battery capacity is the __________-__________ rating.
5-hour discharge
Batteries must be kept __________ and the terminals must be kept __________ and free of __________.
clean,
tight,
corrosion
Corrosion and deposits can be removed from a lead-acid battery or battery box by scrubbing with a soft __________ __________ and a solution of __________ __________ and water.
bristle brush,
sodium bicarbonate
Care should be taken to avoid getting any baking soda in the cells of a lead-acid battery because baking soda __________ the electrolyte.
neutralizes
