Aircraft Electrical Systems Flashcards
What is meant by a trip free circuit breaker?
A circuit breaker that cannot be closed while a fault exists regardless of the position of the operating handle.
What is meant by a slow blow fuse?
A fuse that will allow more current than its rating to flow for a short period of time but will open the circuit if more than its rated current continues to flow.
What is the function of a fuse or circuit breaker in an aircraft electrical circuit.
it protects the wiring from an excess of current, it will open the circuit if enough current flows to heat the wire.
What are two principles upon which circuit breakers operate?
Magnetic circuit breakers open a circuit when the current creates a strong enough magnetic field. Thermal circuit breakers open a circuit when the current causes enough heat.
What circuit in an aircraft electrical system is not required to have a circuit protective device?
the main circuit for starter motors,used during starting only .
Is an automatic reset circuit breaker approved for aircraft electrical circuits?
No, a manual operation is needed to restore service after the circuit breaker has tripped.
How does a vibrator type voltage regulator maintain constant voltage?
When the voltage rises above the desired value, an electromagnetic relay opens and inserts a resistor in the generator field circuit, decreasing the field current and lowering the generator output voltage.
What two components are normally housed with a vibrator voltage regulator in a single unit generator control?
a current limiter and a reverse current cutout relay.
