AMS 274 unit 3 Exam Questions with Detailed
Answers
What are the 2 types of lubrication systems - -Pressure regulated system
variable pressure system
-why are engines lubrication - -prevent metal to metal contact
Reduce friction between moving parts - primary
Cushion, cool, and clean - secondary
-What kind of oil pumps are used in gas turbine engines - -Vane type
Gerotor
gear
(All pumps are positive displacement)
-What is a multiple element pump - -single pressure multiple scavenging
-Oil tank deaerator - -1. also known as the dwell chamber
2. provides means of separating entrained are from the scavenge oil
-What is used to cool oil - -Fuel/oil
Air/oil
-Oil consists of what 3 subsystems - -1. Pressure relief/variable pressure
2. Scavenging
3. Breather Vent
-what is the Last chance oil filter's purpose - -preventing plugging of the oil jets
some are only accessible for cleanings during engine over haul
-What is the terminating point of the oil pressure system - -Oil jest
-What is the difference between hot tanks system and cold tank system - -1. Hot tank - oil
cooler is located in the pressure system.
2. Cold tank - oil cooler located in the in the scavenge subsystem
-What is the purpose of a Fuel/ Oil Cooler - -to keep the oil at a specific oil temp
-What is the purpose of a thermostatic valve - -bypasses oil from the oil cooler
-What is thermal lockout - -prevents the impending bypass button to op out due to cold
weather starting that causes high oil pressure
Answers
What are the 2 types of lubrication systems - -Pressure regulated system
variable pressure system
-why are engines lubrication - -prevent metal to metal contact
Reduce friction between moving parts - primary
Cushion, cool, and clean - secondary
-What kind of oil pumps are used in gas turbine engines - -Vane type
Gerotor
gear
(All pumps are positive displacement)
-What is a multiple element pump - -single pressure multiple scavenging
-Oil tank deaerator - -1. also known as the dwell chamber
2. provides means of separating entrained are from the scavenge oil
-What is used to cool oil - -Fuel/oil
Air/oil
-Oil consists of what 3 subsystems - -1. Pressure relief/variable pressure
2. Scavenging
3. Breather Vent
-what is the Last chance oil filter's purpose - -preventing plugging of the oil jets
some are only accessible for cleanings during engine over haul
-What is the terminating point of the oil pressure system - -Oil jest
-What is the difference between hot tanks system and cold tank system - -1. Hot tank - oil
cooler is located in the pressure system.
2. Cold tank - oil cooler located in the in the scavenge subsystem
-What is the purpose of a Fuel/ Oil Cooler - -to keep the oil at a specific oil temp
-What is the purpose of a thermostatic valve - -bypasses oil from the oil cooler
-What is thermal lockout - -prevents the impending bypass button to op out due to cold
weather starting that causes high oil pressure
