A&P - POWERPLANT ORAL (JEPPESEN)
NEWEST 2025-2026 ACTUAL EXAM
GRADED A+
What is the purpose of the interconnecting tubes attached
between can-type combustion chambers? Correct Answer For
flame propagation during start.
What functions do axial flow turbine nozzles perform? Correct
Answer They direct the mass airflow to drive the turbine rotor at a
specific angle.
How is thermal stress relieved on a turbine disc? Correct Answer
By directing bleed air onto the face of the disk, or by grooves
being cut in the disk.
What is shaft horsepower? Correct Answer It is an indication of
the torque developed by a turboprop or turboshaft engine.
What is fan blade shingling? Correct Answer It is the overlapping
of the midspan shrouds of the fan blade.
,Name the three components on the induction system of a
reciprocating engine. Correct Answer The air scoop, carburetor or
fuel control, and the intake manifold.
What could happen if the induction system becomes obstructed?
Correct Answer The engine may not be able to produce its rated
power or it may not run at all. This may also be an indication of a
dirty air inlet filter.
How does induction icing affect engine performance? Correct
Answer It causes a reduction in power and possible erratic
operation.
How is induction icing categorized? Correct Answer As impact ice,
fuel evaporation ice, and throttle ice.
What is the common method used to prevent induction system ice
in a reciprocating engine? Correct Answer Raise the temperature
of induction air with a preheater.
What causes fuel evaporation ice? Correct Answer Fuel
evaporation ice is formed because of the decrease in air
temperature resulting from evaporation of the fuel after it is
introduced into the air stream.
,Is carburetor throttle ice more likely to occur at a higher or lower
power setting? Why? Correct Answer At a lower power setting
because the throttle is partly closed, offering a larger surface area
for ice accumulation.
What is a split compressor system? Correct Answer Also called
dual or twin spool compressors, these are connected to the
turbine section with two rotor shafts, one inside the other.
What are the different types of combustion chambers used in
turbine engines? Correct Answer Can, annular, can-annular, and
reverse flow annular.
Name the major components in a gas turbine engine. Correct
Answer Air inlet, compressor section, combustion section, turbine
section, exhaust section, gearbox and accessory section.
What prevents the combustion chambers from burning? Correct
Answer Cooling air along the inside of the liner.
What may be the indication of leaking intake pipes? Correct
Answer The engine runs rough at low r.p.m.
What happens to engine power when the carburetor heat is
applied? Correct Answer There is a noticeable drop in power.
, What could happen if carburetor heat is applied at high engine
power settings? Correct Answer Detonation.
Where does the APU get its fuel supply? Correct Answer From
one of the aircraft's main fuel tanks.
What are two types of supercharged induction systems? Correct
Answer Internally driven and externally driven.
How and at what point does an internally driven supercharger
boost air pressure? Correct Answer An (engine-driven) impeller
compresses the fuel/air mixture after it leaves the carburetor.
What is used to power a turbocharger? Correct Answer Engine
exhaust gas directed onto the turbocharger turbine.
What could result if the waste gate on a turbocharger system
does not close fully? Correct Answer The engine may not be able
to produce its rated power at certain altitudes, and the aircraft
may not be capable of reaching critical altitude.
What function does a turbocharger waste gate perform? Correct
Answer It controls the amount of exhaust gas either into or around
NEWEST 2025-2026 ACTUAL EXAM
GRADED A+
What is the purpose of the interconnecting tubes attached
between can-type combustion chambers? Correct Answer For
flame propagation during start.
What functions do axial flow turbine nozzles perform? Correct
Answer They direct the mass airflow to drive the turbine rotor at a
specific angle.
How is thermal stress relieved on a turbine disc? Correct Answer
By directing bleed air onto the face of the disk, or by grooves
being cut in the disk.
What is shaft horsepower? Correct Answer It is an indication of
the torque developed by a turboprop or turboshaft engine.
What is fan blade shingling? Correct Answer It is the overlapping
of the midspan shrouds of the fan blade.
,Name the three components on the induction system of a
reciprocating engine. Correct Answer The air scoop, carburetor or
fuel control, and the intake manifold.
What could happen if the induction system becomes obstructed?
Correct Answer The engine may not be able to produce its rated
power or it may not run at all. This may also be an indication of a
dirty air inlet filter.
How does induction icing affect engine performance? Correct
Answer It causes a reduction in power and possible erratic
operation.
How is induction icing categorized? Correct Answer As impact ice,
fuel evaporation ice, and throttle ice.
What is the common method used to prevent induction system ice
in a reciprocating engine? Correct Answer Raise the temperature
of induction air with a preheater.
What causes fuel evaporation ice? Correct Answer Fuel
evaporation ice is formed because of the decrease in air
temperature resulting from evaporation of the fuel after it is
introduced into the air stream.
,Is carburetor throttle ice more likely to occur at a higher or lower
power setting? Why? Correct Answer At a lower power setting
because the throttle is partly closed, offering a larger surface area
for ice accumulation.
What is a split compressor system? Correct Answer Also called
dual or twin spool compressors, these are connected to the
turbine section with two rotor shafts, one inside the other.
What are the different types of combustion chambers used in
turbine engines? Correct Answer Can, annular, can-annular, and
reverse flow annular.
Name the major components in a gas turbine engine. Correct
Answer Air inlet, compressor section, combustion section, turbine
section, exhaust section, gearbox and accessory section.
What prevents the combustion chambers from burning? Correct
Answer Cooling air along the inside of the liner.
What may be the indication of leaking intake pipes? Correct
Answer The engine runs rough at low r.p.m.
What happens to engine power when the carburetor heat is
applied? Correct Answer There is a noticeable drop in power.
, What could happen if carburetor heat is applied at high engine
power settings? Correct Answer Detonation.
Where does the APU get its fuel supply? Correct Answer From
one of the aircraft's main fuel tanks.
What are two types of supercharged induction systems? Correct
Answer Internally driven and externally driven.
How and at what point does an internally driven supercharger
boost air pressure? Correct Answer An (engine-driven) impeller
compresses the fuel/air mixture after it leaves the carburetor.
What is used to power a turbocharger? Correct Answer Engine
exhaust gas directed onto the turbocharger turbine.
What could result if the waste gate on a turbocharger system
does not close fully? Correct Answer The engine may not be able
to produce its rated power at certain altitudes, and the aircraft
may not be capable of reaching critical altitude.
What function does a turbocharger waste gate perform? Correct
Answer It controls the amount of exhaust gas either into or around
