POWERPLANT ORAL STUDY GUIDE MOCK
QUESTIONS AND AIRCRAFT ENGINE SYSTEMS
ORAL PRACTICE SCENARIOS
◉ How do you check a thermocouple fire detection system for
operation? (AM.III.E.K2).
Answer: Press the test switch. This heats the test thermocouple
enough for it to close the sensitive relay, which in turn closes the
slave relay and activates the fire warning light and bell.
◉ How is a pneumatic-type continuous-loop fire detection system
checked for operation? (AM.III.E.K2).
Answer: When the test switch is closed, low-voltage AC flows
through the tube that encloses the sensitive element. This current
heats the element enough for it to release sufficient gas to activate
the alarm switch.
◉ Name one type of oil filter used in aircraft engines? (AM.III.G.K2).
Answer: Cuno, canister or spin-on.
◉ What are six functions of the oil in an aircraft engine?
(AM.III.G.K2).
, Answer: Reduces friction, seals and cushions, removes heat, cleans
inside the engine, protects against corrosion and performs hydraulic
action.
◉ What is the purpose of an air-oil separator, or deaerator, in a
turbine engine oil tank? (AM.III.G.K2).
Answer: In normal operation, the oil picks up a quantity of air and it
is swirled as it enters the deaerator. The swirling action releases the
air from the oil and the air is used to pressurize the oil tank.
◉ How is oil pressure regulated in an aircraft engine? (AM.III.G.K2).
Answer: A pressure-relief valve senses the desired pressure and
sends excess oil back into the engine sump.
◉ What is the purpose of the restricted orifice in the line between
the oil pressure gauge and the engine? (AM.III.G.K2).
Answer: The restricted fitting helps dampen any pulsations in the oil
pressure caused by the pump.
◉ What is a hot-tank lubrication system for a turbojet engine?
(AM.III.G.K2).
Answer: A lubrication system in which the oil cooler is in the
pressure subsystem and the scavenger oil is not cooled before it is
returned to the tank.
QUESTIONS AND AIRCRAFT ENGINE SYSTEMS
ORAL PRACTICE SCENARIOS
◉ How do you check a thermocouple fire detection system for
operation? (AM.III.E.K2).
Answer: Press the test switch. This heats the test thermocouple
enough for it to close the sensitive relay, which in turn closes the
slave relay and activates the fire warning light and bell.
◉ How is a pneumatic-type continuous-loop fire detection system
checked for operation? (AM.III.E.K2).
Answer: When the test switch is closed, low-voltage AC flows
through the tube that encloses the sensitive element. This current
heats the element enough for it to release sufficient gas to activate
the alarm switch.
◉ Name one type of oil filter used in aircraft engines? (AM.III.G.K2).
Answer: Cuno, canister or spin-on.
◉ What are six functions of the oil in an aircraft engine?
(AM.III.G.K2).
, Answer: Reduces friction, seals and cushions, removes heat, cleans
inside the engine, protects against corrosion and performs hydraulic
action.
◉ What is the purpose of an air-oil separator, or deaerator, in a
turbine engine oil tank? (AM.III.G.K2).
Answer: In normal operation, the oil picks up a quantity of air and it
is swirled as it enters the deaerator. The swirling action releases the
air from the oil and the air is used to pressurize the oil tank.
◉ How is oil pressure regulated in an aircraft engine? (AM.III.G.K2).
Answer: A pressure-relief valve senses the desired pressure and
sends excess oil back into the engine sump.
◉ What is the purpose of the restricted orifice in the line between
the oil pressure gauge and the engine? (AM.III.G.K2).
Answer: The restricted fitting helps dampen any pulsations in the oil
pressure caused by the pump.
◉ What is a hot-tank lubrication system for a turbojet engine?
(AM.III.G.K2).
Answer: A lubrication system in which the oil cooler is in the
pressure subsystem and the scavenger oil is not cooled before it is
returned to the tank.
