Circuit Protection
What is the advantage of a current limiter?
It will take overload for a short period.
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 is referred to as a
single-pole, single-throw (SPST), two-position switch.
The purpose of a rectifier in an electrical system is to change
AC to DC
To what depth is the mica insulation between the commutator bars of a DC generator undercut?
Equal to the width of the mica.
What is the maximum amount of time a circuit can be in operation and still be an intermittent duty circuit?
2 minutes
Aircraft fuse capacity is rated in
Amperes
Microswitches are used primarily as limit switches to
control electrical units automatically
Some electric motors have two sets of field windings wound in opposite directions so that the
motor can be operated in either direction.
During ground operation, aircraft generator cooling is usually accomplished by
Integral Fan
In aircraft electrical systems, automatic reset circuit breakers
should not be used as circuit protective devices.
Electric circuits are protected from overheating by
Fuses
If one switch is used to control all navigation lights, the lights are most likely connected
parallel to each other and in series with the switch
If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open
depends on the load carried by the generator.
What are the major parts of a DC motor?
Armature assembly, field assembly, brush assembly, and end frame.
The poles of a generator are laminated to
reduce eddy current losses.
What is the advantage of a circuit breaker when compared to a fuse?
lt is resettable and reusable.
A certain switch is described as a single-pole, double-throw (SPDT) switch. The throw of a switch indicates the number of
Circuits each pole can complete through the switch
What is a cause of generator brush arcing?
Low spring tension
If the positive field lead between a generator and a generator control panel breaks and is shorted while the engine is running, a voltmeter connected to generator out-put would indicate
Residual Voltage
When handling a high voltage capacitor in an electrical circuit, be sure it
is fully discharged before removing it from the circuit.
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 kind of switch should you install in a single wire circuit that required the switch to be manually held in the ON position?
SPST two position switch (NO)
The starting current of a series-wound DC motor, in passing through both the field and armature windings, produces a
high starting torque.
What is a method used for restoring generator field residual magnetism?
Flash the fields
The voltage in an AC transformer secondary that contains twice as many loops as the primary will be
Greater and the amperage less than in the primary