POWERPLANT ASA BAKER SCHOOL FAA
ORAL QUESTIONS CERTIFICATION REVIEW
2026 TESTED ANSWERS GRADED A+
⩥ Does a series-wound DC motor have a high or 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 must be disconnected first and connected last.
⩥ What is meant by 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 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.
⩥ 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 oil is carried inside the engine
itself.
⩥ What is meant by a dry sump lubrication system?
Answer: A lubrication system in which oil is carried in a tank that is not
a part of the engine.
⩥ How is oil temperature controlled in an aircraft reciprocating engine?
Answer: Hot oil is directed through the core of the oil cooler, but oil is
directed around the outside of the core so it will not be further cooled.
⩥ Is the oil temperature shown on the aircraft instrument panel the
temperature of the oil entering the engine or of the oil leaving the
engine?
Answer: It is the temperature of oil entering the engine.
, ⩥ What is the purpose of oil dilution in a reciprocating engine?
Answer: When very cold weather is anticipated, gasoline can be mixed
with the lubricating oil before the engine is shut down to reduce
viscosity and make starting easier.
⩥ What is the function of the hopper in the oil tanks used with some
reciprocating engines?
Answer: Hoppers are a part of the oil dilution system that speeds up
dilution and requires less gasoline.
⩥ What happens to the gasoline that is used to dilute the oil in the
crankcase of an aircraft reciprocating engine?
Answer: When the engine is running and the oil is warm, the gasoline
evaporates out of it.
⩥ What is the purpose of the sludge plugs in the crankshaft of a
reciprocating engine?
Answer: They trap sludge that is in the oil and hold it until the engine is
disassembled.
⩥ Which pump is larger in a dry sump lubricating system, the pressure
pump or the scavenger pump?
Answer: The scavenger pump has the greater volume.
ORAL QUESTIONS CERTIFICATION REVIEW
2026 TESTED ANSWERS GRADED A+
⩥ Does a series-wound DC motor have a high or 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 must be disconnected first and connected last.
⩥ What is meant by 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 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.
⩥ 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 oil is carried inside the engine
itself.
⩥ What is meant by a dry sump lubrication system?
Answer: A lubrication system in which oil is carried in a tank that is not
a part of the engine.
⩥ How is oil temperature controlled in an aircraft reciprocating engine?
Answer: Hot oil is directed through the core of the oil cooler, but oil is
directed around the outside of the core so it will not be further cooled.
⩥ Is the oil temperature shown on the aircraft instrument panel the
temperature of the oil entering the engine or of the oil leaving the
engine?
Answer: It is the temperature of oil entering the engine.
, ⩥ What is the purpose of oil dilution in a reciprocating engine?
Answer: When very cold weather is anticipated, gasoline can be mixed
with the lubricating oil before the engine is shut down to reduce
viscosity and make starting easier.
⩥ What is the function of the hopper in the oil tanks used with some
reciprocating engines?
Answer: Hoppers are a part of the oil dilution system that speeds up
dilution and requires less gasoline.
⩥ What happens to the gasoline that is used to dilute the oil in the
crankcase of an aircraft reciprocating engine?
Answer: When the engine is running and the oil is warm, the gasoline
evaporates out of it.
⩥ What is the purpose of the sludge plugs in the crankshaft of a
reciprocating engine?
Answer: They trap sludge that is in the oil and hold it until the engine is
disassembled.
⩥ Which pump is larger in a dry sump lubricating system, the pressure
pump or the scavenger pump?
Answer: The scavenger pump has the greater volume.
