Module 9 Flashcards
Electric circuits are protected from overheating by means of?
Fuses
The three types of Circuit Protection devices most commonly used in aircraft circuits are?
Fuses,Circuit breakers, current limiters
Aircraft fuse capacity is rated in?
Amps
What is an important factor in selecting aircraft fuses?
The the capacity matches the circuit requirements
A circuit protection device called a current limiter is essentially a slow blow fuse and is designed to be used in?
heavy power circuits
What is the advantage of a current limiter?
It will accept overload for a certain amount of time
A circuit breaker is installed in an aircraft electrical system primarily to protect the?
Circuit
The circuit breaker in the the instrument lighting system protects the?
Wiring system from too much current.
What is the advantage of a circuit breaker when compared to a fuse?
Resettable & reusable
In aircraft electrical systems automatic reset circuit breakers?
Should not be used in circuit protection.
A thermal switch or thermal protector as used in an electrical motor, is designed to:
open the circuit & protect the motor from overheating by allowing it to cool down.
The normal rating of electrical switches refers to continuous _________ rating with the contacts _________
current, closed
What is the purpose of the selection of De-rated switches for known continuous load current applications?
Better efficiency & longer life
The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an On position and an Off position, with no additional positions possible. This switch would be referred to as a ?
Single pole, Single throw two position switch.
What kind of switch should you install in a single wire circuit that required the switch to be manually held in the on position?
Single pole, single throw two position normally open switch
A certain switch is described as a single-pole double-throw switch (SPDT). The “Throw” of a switch indicated the number of:
circuits each pole can complete through the switch.
Circuits that must be operated only in an Emergency, or whose inadvertent activation could endanger a system, frequently employ?
Guarded switches
An aircraft electrical circuit control relay is?
An electrically operated switch.
A battery-generator system provides direct current, on installations requiring alternating current from the battery-generator system it is necessary to have?
An inverter
Static inverters are electronic devices that change DC to AC with the use of
An oscillator
The purpose of a rectifier in an electrical system is to change:
AC to DC
Certain transport aircraft use AC electrical power for all normal operation and battery-furnished DC electrical power for standby emergency use. In aircraft of this type that operate no DC generators, the batteries are kept charged by
Rectifiers
Aircraft which operate only AC generators (alternators) as a primary source of electrical power normally provide current suitable for battery charging through the use oF?
Stepdown transformer & rectifier
A typical application for Zener diodes is?
As voltage regulators
