ASA Powerplant Oral Study Guide (All Questions) Most Recent
Exam 2026 Actual Complete Real Exam Questions With
Correct Answers ( Verified Answers) Already Graded A+ |
Guaranteed Success!! | Newest Exam | Just Released!!
What is the purpose of the shielding that is used to encase
some electrical wires? - ANSWER-Shielding intercepts radiated
electromagnet energy and carries it to ground so it will not
interfere with any nearby sensitive electronic equipment.
Why must a switch be derated if it is used in a circuit
controlling a DC electric
motor? - ANSWER-The initial current flowing into a DC electric
motor is much
higher than the current the motor uses after the armature.
begins to rotate
Because of this high inrush current, the controlling switches
must be derated.
What is used as the rectifier to produce direct current in a
DC generator? -
ANSWER-Brushes and a
commutator.
How does a vibrator-type voltage regulator control the output
voltage of a DC generator? - ANSWER-The strength of the
magnetic field produced in the voltage regulator relay is
proportional to the generator output voltage. When the voltage
,rises above the regulated value, the relay pulls the contacts
open and inserts a resistor in the generator field circuit. The
contacts vibrate open and closed, putting the resistor in and
out of the field circuit to control the amount of voltage the
generator produces.
What is meant by paralleling the generators of a twin-engine
aircraft? - ANSWER-Adjusting the voltage of the generators so
they will share the electrical load equally.
What is meant by flashing the field of a DC generator? -
ANSWER-Restoring the residual magnetism to the frame of a
generator by passing battery current through the field coils in
the same direction it flows when the generator is producing
current.
What kind of rectifier is used in a DC alternator of the type that
is used on most
of the modern light airplanes? - ANSWER-A full-wave, three-
phase rectifier
made up of six silicon
diodes.
What is used to maintain a constant frequency of the
alternating current that is produced by an AC alternator driven
by an aircraft turbine engine? – ANSWER-A hydraulic constant-
speed drive unit between the engine and the alternator.
,What three things must be synchronized before a three-phase
AC generator
can be connected to a bus that is being served by another
generator? -
ANSWER-The voltage, the frequency, and the phase rotation of
the generators.
What must be done to reverse the direction of rotation of the
armature of a DC
electric motor? - ANSWER-The current flow must be
reversed through the
armature or the field windings, but not through
both of them.
Does a series-wound DC motor have a high or a low
starting torque? -
ANSWER-A high starting
torque.
Which aircraft electrical circuit does not normally contain
a fuse or circuit
breaker? - ANSWER-The starter
motor circuit.
When removing a battery from an aircraft, which connection
should be removed
first? - ANSWER-The ground connection must be
disconnected first and
, connected
last.
What is meant by the effective voltage of sine wave alternating
current? - ANSWER-The value of the alternating current that is
needed to produce the same amount of heat as this value of
direct current.
What is a starter-generator that is used with many of the
smaller gas turbine engines? - ANSWER-A single-engine-
mounted component that serves as a starter for starting the
turbine engine. When the engine is running, the circuitry can be
shifted so it acts as a compound-wound generator.
When should aircraft wiring be installed in a conduit? -
ANSWER-When the wiring passes through an area in the
aircraft where open wiring could likely be damaged, such as
through a wheel well.
What is meant by the viscosity of engine lubricating oil? -
ANSWER-The
resistance of the oil to
flow.
What is meant by a wet sump lubrication system? -
ANSWER-A lubrication
system in which the oil is carried inside the
engine itself.
Exam 2026 Actual Complete Real Exam Questions With
Correct Answers ( Verified Answers) Already Graded A+ |
Guaranteed Success!! | Newest Exam | Just Released!!
What is the purpose of the shielding that is used to encase
some electrical wires? - ANSWER-Shielding intercepts radiated
electromagnet energy and carries it to ground so it will not
interfere with any nearby sensitive electronic equipment.
Why must a switch be derated if it is used in a circuit
controlling a DC electric
motor? - ANSWER-The initial current flowing into a DC electric
motor is much
higher than the current the motor uses after the armature.
begins to rotate
Because of this high inrush current, the controlling switches
must be derated.
What is used as the rectifier to produce direct current in a
DC generator? -
ANSWER-Brushes and a
commutator.
How does a vibrator-type voltage regulator control the output
voltage of a DC generator? - ANSWER-The strength of the
magnetic field produced in the voltage regulator relay is
proportional to the generator output voltage. When the voltage
,rises above the regulated value, the relay pulls the contacts
open and inserts a resistor in the generator field circuit. The
contacts vibrate open and closed, putting the resistor in and
out of the field circuit to control the amount of voltage the
generator produces.
What is meant by paralleling the generators of a twin-engine
aircraft? - ANSWER-Adjusting the voltage of the generators so
they will share the electrical load equally.
What is meant by flashing the field of a DC generator? -
ANSWER-Restoring the residual magnetism to the frame of a
generator by passing battery current through the field coils in
the same direction it flows when the generator is producing
current.
What kind of rectifier is used in a DC alternator of the type that
is used on most
of the modern light airplanes? - ANSWER-A full-wave, three-
phase rectifier
made up of six silicon
diodes.
What is used to maintain a constant frequency of the
alternating current that is produced by an AC alternator driven
by an aircraft turbine engine? – ANSWER-A hydraulic constant-
speed drive unit between the engine and the alternator.
,What three things must be synchronized before a three-phase
AC generator
can be connected to a bus that is being served by another
generator? -
ANSWER-The voltage, the frequency, and the phase rotation of
the generators.
What must be done to reverse the direction of rotation of the
armature of a DC
electric motor? - ANSWER-The current flow must be
reversed through the
armature or the field windings, but not through
both of them.
Does a series-wound DC motor have a high or a low
starting torque? -
ANSWER-A high starting
torque.
Which aircraft electrical circuit does not normally contain
a fuse or circuit
breaker? - ANSWER-The starter
motor circuit.
When removing a battery from an aircraft, which connection
should be removed
first? - ANSWER-The ground connection must be
disconnected first and
, connected
last.
What is meant by the effective voltage of sine wave alternating
current? - ANSWER-The value of the alternating current that is
needed to produce the same amount of heat as this value of
direct current.
What is a starter-generator that is used with many of the
smaller gas turbine engines? - ANSWER-A single-engine-
mounted component that serves as a starter for starting the
turbine engine. When the engine is running, the circuitry can be
shifted so it acts as a compound-wound generator.
When should aircraft wiring be installed in a conduit? -
ANSWER-When the wiring passes through an area in the
aircraft where open wiring could likely be damaged, such as
through a wheel well.
What is meant by the viscosity of engine lubricating oil? -
ANSWER-The
resistance of the oil to
flow.
What is meant by a wet sump lubrication system? -
ANSWER-A lubrication
system in which the oil is carried inside the
engine itself.
