©JUSTTRACY EXAM SOLUTIONS
14/11/2024 14:24PM
Airframe Electricity Final ASA Updated
Exam Questions And Answers
Electric wire terminals for most aircraft applications must be what type?
A— Slotted.
B— Hook.
C— Ring. - answers✔✔C
If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage
regulator points remain open
A— depends on the load carried by the generator.
B— is controlled by the reverse-current cutout relay point clearance.
C— is increased when the external load is greater than the generator output. - answers✔✔A
What is a cause of generator brush arcing?
A— Seating brushes with No. 000 sandpaper.
B— Carbon dust particles.
C— Low spring tension. - answers✔✔C
What is required when operating two aircraft AC generators in parallel?
A— Amperes and frequency must both be equal.
B— Frequency and voltage must both be equal.
C— Amperes and voltage must both be equal. - answers✔✔
The only practical method of maintaining a constant voltage output from an aircraft generator
under varying conditions of speed and load is to vary the
A— strength of the magnetic field. B— number of conductors in the armature.
C— speed at which the armature rotates. - answers✔✔A
, ©JUSTTRACY EXAM SOLUTIONS
14/11/2024 14:24PM
The pole pieces or shoes used in a DC generator are a part of the
A— armature assembly.
B— field assembly.
C— brush assembly. - answers✔✔B
How many cycles of AC voltage are produced in a six-pole alternator of the revolving-field
type for each revolution of the rotor?
A— Four.
B— Three.
C— Six. - answers✔✔B
If the reverse current cutout relay contact points fail to open after the generator output has
dropped below battery potential, current will flow through the generator armature
A— in the normal direction and through the shunt field opposite the normal direction.
B— and the shunt field opposite the normal direction.
C— opposite the normal direction and through the shunt f ield in the normal direction. -
answers✔✔C
How does the magnetic brake used to stop rotation of an electric motor armature operate?
A— Centrifugal force releases a rotating brake cog from a stationary notch when the
armature reaches a certain speed and magnetic force re-engages the cog when the electrical
power is turned off.
B— A friction brake is applied by a magnet and released by a spring.
C— A friction brake is applied by a spring and released by a magnet. - answers✔✔C
In a generator, what eliminates any possible sparking to the brush guides caused by the
movement of the brushes within the holder? A— The brush pigtail.
B— Brush spring tension.
C— Undercutting the mica on the commutator. - answers✔✔A
, ©JUSTTRACY EXAM SOLUTIONS
14/11/2024 14:24PM
The commutator of a generator
A— changes direct current produced in the armature into alternating current as it is taken
from the armature.
B— changes alternating current produced in the armature into direct current as it is taken
from the armature.
C— reverses the current in the field coils at the proper time in order to produce direct current.
- answers✔✔B
An ammeter in a battery charging system is for the purpose of indicating the
A— amperage available for use.
B— total amperes being used in the airplane.
C— rate of current used to charge the battery. - answers✔✔C
Which of the following is not one of the purposes of interpoles in a generator?
A— Reduce field strength.
B— Overcome armature reaction. C— Reduce arcing at the brushes. - answers✔✔A
A voltage regulator controls generator output by
A— introducing a resistance in generator-to-battery lead in the event of overload.
B— shorting out field coil in the event of overload.
C— varying current flow to generator field coil. - answers✔✔C
Which type of DC generator is not used as an airplane generator?
A— Externally grounded.
B— Series wound.
C— Compound wound. - answers✔✔B
During ground operation, aircraft generator cooling is usually accomplished by
A— auxiliary air cooled through an air/fuel heat exchanger.
B— an integral fan.
14/11/2024 14:24PM
Airframe Electricity Final ASA Updated
Exam Questions And Answers
Electric wire terminals for most aircraft applications must be what type?
A— Slotted.
B— Hook.
C— Ring. - answers✔✔C
If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage
regulator points remain open
A— depends on the load carried by the generator.
B— is controlled by the reverse-current cutout relay point clearance.
C— is increased when the external load is greater than the generator output. - answers✔✔A
What is a cause of generator brush arcing?
A— Seating brushes with No. 000 sandpaper.
B— Carbon dust particles.
C— Low spring tension. - answers✔✔C
What is required when operating two aircraft AC generators in parallel?
A— Amperes and frequency must both be equal.
B— Frequency and voltage must both be equal.
C— Amperes and voltage must both be equal. - answers✔✔
The only practical method of maintaining a constant voltage output from an aircraft generator
under varying conditions of speed and load is to vary the
A— strength of the magnetic field. B— number of conductors in the armature.
C— speed at which the armature rotates. - answers✔✔A
, ©JUSTTRACY EXAM SOLUTIONS
14/11/2024 14:24PM
The pole pieces or shoes used in a DC generator are a part of the
A— armature assembly.
B— field assembly.
C— brush assembly. - answers✔✔B
How many cycles of AC voltage are produced in a six-pole alternator of the revolving-field
type for each revolution of the rotor?
A— Four.
B— Three.
C— Six. - answers✔✔B
If the reverse current cutout relay contact points fail to open after the generator output has
dropped below battery potential, current will flow through the generator armature
A— in the normal direction and through the shunt field opposite the normal direction.
B— and the shunt field opposite the normal direction.
C— opposite the normal direction and through the shunt f ield in the normal direction. -
answers✔✔C
How does the magnetic brake used to stop rotation of an electric motor armature operate?
A— Centrifugal force releases a rotating brake cog from a stationary notch when the
armature reaches a certain speed and magnetic force re-engages the cog when the electrical
power is turned off.
B— A friction brake is applied by a magnet and released by a spring.
C— A friction brake is applied by a spring and released by a magnet. - answers✔✔C
In a generator, what eliminates any possible sparking to the brush guides caused by the
movement of the brushes within the holder? A— The brush pigtail.
B— Brush spring tension.
C— Undercutting the mica on the commutator. - answers✔✔A
, ©JUSTTRACY EXAM SOLUTIONS
14/11/2024 14:24PM
The commutator of a generator
A— changes direct current produced in the armature into alternating current as it is taken
from the armature.
B— changes alternating current produced in the armature into direct current as it is taken
from the armature.
C— reverses the current in the field coils at the proper time in order to produce direct current.
- answers✔✔B
An ammeter in a battery charging system is for the purpose of indicating the
A— amperage available for use.
B— total amperes being used in the airplane.
C— rate of current used to charge the battery. - answers✔✔C
Which of the following is not one of the purposes of interpoles in a generator?
A— Reduce field strength.
B— Overcome armature reaction. C— Reduce arcing at the brushes. - answers✔✔A
A voltage regulator controls generator output by
A— introducing a resistance in generator-to-battery lead in the event of overload.
B— shorting out field coil in the event of overload.
C— varying current flow to generator field coil. - answers✔✔C
Which type of DC generator is not used as an airplane generator?
A— Externally grounded.
B— Series wound.
C— Compound wound. - answers✔✔B
During ground operation, aircraft generator cooling is usually accomplished by
A— auxiliary air cooled through an air/fuel heat exchanger.
B— an integral fan.
