ASA POWERPLANT ORAL STUDY GUIDE (ALL QUESTIONS)
MOST RECENT EXAM FREQUENTLY MOST TESTED
QUESTIONS AND CORRECT ANSWERS ( EXPERT VERIFIED
AND DETAILED ANSWERS) FOR QUARANTEED PASS | A+
GRADED | LATEST UPDATE 2026 !!! GET IT 100%
ACCURATE!!
At what point in a turbine engine is the temperature the highest? -
ANSWER-At the inlet to the high-pressure turbine.
At what speed does the camshaft turn, relative to the crankshaft speed in a
horizontally opposed engine? - ANSWER-The camshaft turns at one half of
the crankshaft speed.
Can a thermal switch-type fire detection system indicate a general overheat
condition? - ANSWER-No, this is a spot-type fire detection system, and it
cannot indicate an overheat indication.
Can a thermocouple-type fire detection system indicate a general overheat
condition? - ANSWER-No, this is a rate-of-temperature-rise-type of system,
and it cannot indicate a general overheat condition.
Do the counterweights on a propeller tend to move the blades toward high
pitch or toward low pitch? - ANSWER-Toward high pitch.
,Does a break in a continuous-loop fire detection system keep the system
from detecting a fire? - ANSWER-No, the unit will show a fault when it is
tested, but it will still warn of a fire.
Does a series-wound DC motor have a high or a low starting torque? -
ANSWER-A high starting torque.
Does centrifugal twisting moment on a propeller blade tend to move the
blades toward high pitch or toward low pitch? - ANSWER-Toward low pitch.
Does the application of carburetor heat cause the fuel-air mixture to
become richer or to become leaner? - ANSWER-Heated air causes the
fuel-air mixture to become richer.
Does the fuel-air mixture provided by a float carburetor become richer or
leaner as the aircraft goes up in altitude? - ANSWER-If the mixture is not
adjusted, it will become richer as the aircraft gains in altitude.
Does the fuel-air mixture provided by a float carburetor become richer or
leaner when carburetor heat is applied? - ANSWER-The mixture becomes
richer when carburetor heat is applied.
Does the pressure-type continuous-element fire detector system detect a
general overheat condition, as well as a fire? - ANSWER-Yes, a high
temperature on a small portion of the sensor or a lower temperature over
the entire sensor will cause it to release enough gas to close the diaphragm
switch and warn of a fire.
,Does the tachometer of a geared reciprocating engine indicate the speed of
the crank shaft or of the propeller shaft? - ANSWER-The speed of the
crankshaft.
How are electrical wires protected where they pass through an area of high
temperature? - ANSWER-Wires passing through these areas are insulated
with high temperature insulation, and the wires are enclosed in some type
of protective conduit.
How are the turbine inlet guide vanes and the first-stage turbine blades in
some turbine engines cooled? - ANSWER-High-pressure compressor bleed
air flows through the hollow guide vanes an hollow turbine blades.
How can a mechanic determine the state of charge of the HRD bottles of
fire extinguishing agent? - ANSWER-A pressure gage on the bottle shows
the pressure of the contents of the bottle.
How do some turbine engines prevent ice formation on the inlet guide
vanes? - ANSWER-Hot compressor bleed air flows through hollow inlet
guide vanes.
How does a noise suppressor reduce the amount of noise produced by a
turbojet engine? - ANSWER-It breaks up the low-frequency vibrations in the
exhaust stream and converts them into higher frequencies. These high
frequencies are dissipated by the air more easily than low frequencies.
How does a power recovery turbine increase the power of a reciprocating
engine? - ANSWER-Exhaust-driven velocity turbines are coupled through a
hydraulic drive to the engine crankshaft. Energy that would normally be lost
, is used to drive the turbines, and the turbines assist in turning the
crankshaft.
How does a torquemeter actually measure the torque produced by an
engine? - ANSWER-A torquemeter is actually an oil pressure gage. The
pressure it measures is produced in a torque sensor and is proportional to
the amount of strain in the torsional shaft that drives the reduction gears of
the turboprop engine.
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.
How does an engine air inlet vortex destroyer help prevent foreign object
damage to the engine? - ANSWER-A high-velocity stream of compressor
bleed air is blown out in front of the engine to break up the vortices that
form in front of the engine when it is operating at high power on the ground.
How does metallic sodium in an exhaust valve aid in transferring heat? -
ANSWER-The sodium melts when the engine is running, and it sloshes up
and down as the valve operates. The sodium picks up heat from the valve
head and carries it into the stem so it can be transferred to the cylinder
head and dissipated into the air.
How does the automatic mixture control in a pressure carburetor keep the
fuel-air mixture constant as the aircraft changes altitude? - ANSWER-It
MOST RECENT EXAM FREQUENTLY MOST TESTED
QUESTIONS AND CORRECT ANSWERS ( EXPERT VERIFIED
AND DETAILED ANSWERS) FOR QUARANTEED PASS | A+
GRADED | LATEST UPDATE 2026 !!! GET IT 100%
ACCURATE!!
At what point in a turbine engine is the temperature the highest? -
ANSWER-At the inlet to the high-pressure turbine.
At what speed does the camshaft turn, relative to the crankshaft speed in a
horizontally opposed engine? - ANSWER-The camshaft turns at one half of
the crankshaft speed.
Can a thermal switch-type fire detection system indicate a general overheat
condition? - ANSWER-No, this is a spot-type fire detection system, and it
cannot indicate an overheat indication.
Can a thermocouple-type fire detection system indicate a general overheat
condition? - ANSWER-No, this is a rate-of-temperature-rise-type of system,
and it cannot indicate a general overheat condition.
Do the counterweights on a propeller tend to move the blades toward high
pitch or toward low pitch? - ANSWER-Toward high pitch.
,Does a break in a continuous-loop fire detection system keep the system
from detecting a fire? - ANSWER-No, the unit will show a fault when it is
tested, but it will still warn of a fire.
Does a series-wound DC motor have a high or a low starting torque? -
ANSWER-A high starting torque.
Does centrifugal twisting moment on a propeller blade tend to move the
blades toward high pitch or toward low pitch? - ANSWER-Toward low pitch.
Does the application of carburetor heat cause the fuel-air mixture to
become richer or to become leaner? - ANSWER-Heated air causes the
fuel-air mixture to become richer.
Does the fuel-air mixture provided by a float carburetor become richer or
leaner as the aircraft goes up in altitude? - ANSWER-If the mixture is not
adjusted, it will become richer as the aircraft gains in altitude.
Does the fuel-air mixture provided by a float carburetor become richer or
leaner when carburetor heat is applied? - ANSWER-The mixture becomes
richer when carburetor heat is applied.
Does the pressure-type continuous-element fire detector system detect a
general overheat condition, as well as a fire? - ANSWER-Yes, a high
temperature on a small portion of the sensor or a lower temperature over
the entire sensor will cause it to release enough gas to close the diaphragm
switch and warn of a fire.
,Does the tachometer of a geared reciprocating engine indicate the speed of
the crank shaft or of the propeller shaft? - ANSWER-The speed of the
crankshaft.
How are electrical wires protected where they pass through an area of high
temperature? - ANSWER-Wires passing through these areas are insulated
with high temperature insulation, and the wires are enclosed in some type
of protective conduit.
How are the turbine inlet guide vanes and the first-stage turbine blades in
some turbine engines cooled? - ANSWER-High-pressure compressor bleed
air flows through the hollow guide vanes an hollow turbine blades.
How can a mechanic determine the state of charge of the HRD bottles of
fire extinguishing agent? - ANSWER-A pressure gage on the bottle shows
the pressure of the contents of the bottle.
How do some turbine engines prevent ice formation on the inlet guide
vanes? - ANSWER-Hot compressor bleed air flows through hollow inlet
guide vanes.
How does a noise suppressor reduce the amount of noise produced by a
turbojet engine? - ANSWER-It breaks up the low-frequency vibrations in the
exhaust stream and converts them into higher frequencies. These high
frequencies are dissipated by the air more easily than low frequencies.
How does a power recovery turbine increase the power of a reciprocating
engine? - ANSWER-Exhaust-driven velocity turbines are coupled through a
hydraulic drive to the engine crankshaft. Energy that would normally be lost
, is used to drive the turbines, and the turbines assist in turning the
crankshaft.
How does a torquemeter actually measure the torque produced by an
engine? - ANSWER-A torquemeter is actually an oil pressure gage. The
pressure it measures is produced in a torque sensor and is proportional to
the amount of strain in the torsional shaft that drives the reduction gears of
the turboprop engine.
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.
How does an engine air inlet vortex destroyer help prevent foreign object
damage to the engine? - ANSWER-A high-velocity stream of compressor
bleed air is blown out in front of the engine to break up the vortices that
form in front of the engine when it is operating at high power on the ground.
How does metallic sodium in an exhaust valve aid in transferring heat? -
ANSWER-The sodium melts when the engine is running, and it sloshes up
and down as the valve operates. The sodium picks up heat from the valve
head and carries it into the stem so it can be transferred to the cylinder
head and dissipated into the air.
How does the automatic mixture control in a pressure carburetor keep the
fuel-air mixture constant as the aircraft changes altitude? - ANSWER-It
