02AF3 - POWERPLANT WRITTEN EXAM
PRACTICE TEST EXAM QUESTIONS
AND ANSWERS | 2026 UPDATE | 100%
CORRECT.
Carburetor - ANS What part of an aircraft in flight will begin to accumulate ice before any
other?
High-heat intensity. - ANS The capacitor-type ignition system is used almost universally on
turbine engines primarily because of its high voltage and...
a) ...low amperage.
b) ...long life.
c) ...high-heat intensity.
Oil control rings on the pistons. - ANS Excessive oil is prevented from accumulating on the
cylinder walls of a reciprocating engine by...
a) ...oil control rings on the pistons.
b) ...internal engine pressure bleeding past the ring grooves.
c) ...the design shape of the piston skirt.
During overhaul. - ANS Lube system last chance filters in turbine engines are usually
cleaned...
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 48
,a) ...during overhaul.
b) ...during 100-hour inspections.
c) ...during annual inspection.
Density of air in the cylinder increases. - ANS As manifold pressure increases in a
reciprocating engine, the...
a) ...density of air in the cylinder increases.
b) ...volume of air in the cylinder increases.
c) ...weight of the fuel/air charge decreases.
The engine manufacturer - ANS Who establishes mandatory replacement times for critical
components of turbine engines?
Visually inspected for any indication of cracks or an operational carbon monoxide detection test
should be done. - ANS On a reciprocating engine aircraft using a shrouded exhaust muffler
system as a source for cabin heat, the exhaust system should be...
a) ...visually inspected for any indication of cracks or an operational carbon monoxide detection
test should be done.
b) ...removed and the exhaust muffler checked for cracks by using magnetic particle inspection
method or an hydrostatic test should be done on the exhaust muffler.
c) ...replaced at each reciprocating engine overhaul by a new or overhauled exhaust system or
an hydrostatic test should be accomplished.
Placing shims between the inner flange and the propeller. - ANS A fixed-pitch wooden
propeller that has been properly installed and the attachment bolts properly torqued exceeds
the out-of-track allowance by 1/16 inch. The excessive out-of-track condition may be corrected
by...
a) ...discarding the propeller since out-of-track conditions cannot be corrected.
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 48
,b) ...slightly overtightening the attachment bolts adjacent to the most forward blade.
c) ...placing shims between the inner flange and the propeller.
Adjusting blade angle for most conditions encountered in flight. - ANS A constant-speed
propeller provides maximum efficiency by...
a) ...adjusting blade angle for most conditions encountered in flight.
b) ...increasing blade pitch as the aircraft speed decreases.
c) ...increasing the lift coefficient of the blade.
Intake, compression, ignition, power, exhaust. - ANS The five events of a four-stroke cycle
engine in the order of their occurrence are...
a) ...intake, power, compression, ignition, exhaust.
b) ...intake, ignition, compression, power, exhaust.
c) ...intake, compression, ignition, power, exhaust.
Thermocouple system. - ANS A fire detection system that operates on the rate-of-
temperature rise is a...
a) ...thermal switch system.
b) ...thermocouple system.
c) ...continuous-loop system.
No wind and low moisture. - ANS Under which of the following conditions will the trimming
of a turbine engine be most accurate?
a) No wind and low moisture.
b) High moisture and low wind.
c) High wind and high moisture.
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 48
, The total piston displacement of the engine - ANS You are performing a 100-hour inspection
on an R985-22 aircraft engine. What does the '985' indicate?
Direct oil through or around the oil cooler. - ANS The purpose of the flow control valve in a
reciprocating engine oil system is to...
a) ...compensate for volumetric increases due to foaming of the oil.
b) ...direct oil through or around the oil cooler.
c) ...deliver cold oil to the hopper tank.
14 CFR Part 23 - ANS Which Federal Aviation Regulation specifies that each resettable circuit
protective device requires a manual operation to restore service after the device has
interrupted the circuit?
Upper deck pressure. - ANS The absolute pressure controller on some small engines is
designed to sense oil pressure which flows through the waste gate actuator and then through
the controllers on the turbocharger system; the pressure between the turbocharger and the
throttle valve is called...
a) ...turbocharger boost pressure.
b) ...upper deck pressure.
c) ...induction manifold pressure.
Percent of Engine RPM - ANS In what units are turbine engine tachometers calibrated?
Diaphragm or Bellows - ANS Instruments that provide readings of low or negative pressure,
such as manifold pressure gauges, are usually what type?
The airstream ahead of the carburetor - ANS Into what part of a reciprocating engine
induction system is deicing alcohol normally injected?
@COPYRIGHT ALL RIGHTS RESERVED PAGE 4 OF 48
PRACTICE TEST EXAM QUESTIONS
AND ANSWERS | 2026 UPDATE | 100%
CORRECT.
Carburetor - ANS What part of an aircraft in flight will begin to accumulate ice before any
other?
High-heat intensity. - ANS The capacitor-type ignition system is used almost universally on
turbine engines primarily because of its high voltage and...
a) ...low amperage.
b) ...long life.
c) ...high-heat intensity.
Oil control rings on the pistons. - ANS Excessive oil is prevented from accumulating on the
cylinder walls of a reciprocating engine by...
a) ...oil control rings on the pistons.
b) ...internal engine pressure bleeding past the ring grooves.
c) ...the design shape of the piston skirt.
During overhaul. - ANS Lube system last chance filters in turbine engines are usually
cleaned...
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 48
,a) ...during overhaul.
b) ...during 100-hour inspections.
c) ...during annual inspection.
Density of air in the cylinder increases. - ANS As manifold pressure increases in a
reciprocating engine, the...
a) ...density of air in the cylinder increases.
b) ...volume of air in the cylinder increases.
c) ...weight of the fuel/air charge decreases.
The engine manufacturer - ANS Who establishes mandatory replacement times for critical
components of turbine engines?
Visually inspected for any indication of cracks or an operational carbon monoxide detection test
should be done. - ANS On a reciprocating engine aircraft using a shrouded exhaust muffler
system as a source for cabin heat, the exhaust system should be...
a) ...visually inspected for any indication of cracks or an operational carbon monoxide detection
test should be done.
b) ...removed and the exhaust muffler checked for cracks by using magnetic particle inspection
method or an hydrostatic test should be done on the exhaust muffler.
c) ...replaced at each reciprocating engine overhaul by a new or overhauled exhaust system or
an hydrostatic test should be accomplished.
Placing shims between the inner flange and the propeller. - ANS A fixed-pitch wooden
propeller that has been properly installed and the attachment bolts properly torqued exceeds
the out-of-track allowance by 1/16 inch. The excessive out-of-track condition may be corrected
by...
a) ...discarding the propeller since out-of-track conditions cannot be corrected.
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 48
,b) ...slightly overtightening the attachment bolts adjacent to the most forward blade.
c) ...placing shims between the inner flange and the propeller.
Adjusting blade angle for most conditions encountered in flight. - ANS A constant-speed
propeller provides maximum efficiency by...
a) ...adjusting blade angle for most conditions encountered in flight.
b) ...increasing blade pitch as the aircraft speed decreases.
c) ...increasing the lift coefficient of the blade.
Intake, compression, ignition, power, exhaust. - ANS The five events of a four-stroke cycle
engine in the order of their occurrence are...
a) ...intake, power, compression, ignition, exhaust.
b) ...intake, ignition, compression, power, exhaust.
c) ...intake, compression, ignition, power, exhaust.
Thermocouple system. - ANS A fire detection system that operates on the rate-of-
temperature rise is a...
a) ...thermal switch system.
b) ...thermocouple system.
c) ...continuous-loop system.
No wind and low moisture. - ANS Under which of the following conditions will the trimming
of a turbine engine be most accurate?
a) No wind and low moisture.
b) High moisture and low wind.
c) High wind and high moisture.
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 48
, The total piston displacement of the engine - ANS You are performing a 100-hour inspection
on an R985-22 aircraft engine. What does the '985' indicate?
Direct oil through or around the oil cooler. - ANS The purpose of the flow control valve in a
reciprocating engine oil system is to...
a) ...compensate for volumetric increases due to foaming of the oil.
b) ...direct oil through or around the oil cooler.
c) ...deliver cold oil to the hopper tank.
14 CFR Part 23 - ANS Which Federal Aviation Regulation specifies that each resettable circuit
protective device requires a manual operation to restore service after the device has
interrupted the circuit?
Upper deck pressure. - ANS The absolute pressure controller on some small engines is
designed to sense oil pressure which flows through the waste gate actuator and then through
the controllers on the turbocharger system; the pressure between the turbocharger and the
throttle valve is called...
a) ...turbocharger boost pressure.
b) ...upper deck pressure.
c) ...induction manifold pressure.
Percent of Engine RPM - ANS In what units are turbine engine tachometers calibrated?
Diaphragm or Bellows - ANS Instruments that provide readings of low or negative pressure,
such as manifold pressure gauges, are usually what type?
The airstream ahead of the carburetor - ANS Into what part of a reciprocating engine
induction system is deicing alcohol normally injected?
@COPYRIGHT ALL RIGHTS RESERVED PAGE 4 OF 48
