III.G.K2 Flashcards
- An oil separator is generally associated with which of the following?
Engine driven vacuum pump.
- The time in seconds required for exactly 60 cubic centimeters of oil to flow through an accurately calibrated orifice at a specific temp is recorded as a measurement of the oil’s?
Viscosity.
- Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of?
Distilled water at a specific temp.
- The type of oil pumps most commonly used on turbine engines are classified as?
Positive displacement.
- As a general rule, the mixture setting on a reciprocating engine operating at or near takeoff power that provides the best cooling is?
Full rich.
- The engine oil temp regulator is usually located between which of the following on a dry sump reciprocating engine?
The scavenger pump outlet and the oil storage tank.
- What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates?
The return oil will be pumped overboard.
- At cruise RPM, some oil will flow through the relief valve of a gear type engine oil pump. This is normal as the relief valve is set at a pressure which is?
Lower than the pressure pump capabilities.
- In a reciprocating engine oil system, the temp bulb senses oil temp?
At a point after the oil has passed through the oil cooler.
- The oil dampened main bearing utilized in some turbine engines is used to?
Provide an oil film between the outer race and the bearing housing in order to reduce vibration tendencies in the rotor system, and to allow for slight misalignment.
- What is the purpose of the last chance oil filters?
To filter the oil immediately before it enters the main bearings.
- In a jet engine which uses a fuel/oil heat exchanger, the oil temp is controlled by a thermostatic valve that regulates the flow of?
Oil through the heat exchanger.
- What prevents pressure within the lubricating oil tank from rising above or falling below ambient pressure?
Oil tank vent.
- In an axial flow turbine engine, compressor bleed air is sometimes used to aid in cooling the?
Turbine, vanes, blades, and bearings.
- Oil picks up the most hest from which of the following turbine engine components?
Turbine bearing.
- Which of the following is a function of the fuel/oil heat exchanger on a turbojet engine?
Increases fuel temp.
- According to the FAR, oil tank fillers on turbine engines must be marked with the word?
Oil.
8447-1. Oil tank fillers on reciprocating engines are marked with the word?
Oil, IAW 14 CFR Part 25.
- Why are fixed orifice nozzles used in the lubrication system of gas turbine engines?
To provide a relatively constant oil flow to the main bearings at all engine speeds.
- What is the primary purpose of the fuel/oil heat exchanger?
Cool the oil.
- What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure?
Oil pressure relief valve.
- What is the primary purpose of the oil breather pressurization system that is used on turbine engjnes?
Provides a proper oil spray pattern from the main bearing oil jets.
- The purpose of directing bleed air to the outer turbine case on some engines is to?
Provide optimum turbine blade tip clearance by controlling thermal expansion.
- Some larger reciprocating engines use a compensating oil pressure relief valve to?
Provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warms up.
- In order to relieve excessive pump pressure in an engine’s internal oil system, most engines are equipped with a?
Relief valve.
- What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine?
Pistons and cylinder walls.
- How are the teeth of the gears in the accessory section of an engine normally lubricated?
By splashed or sprayed oil.
- Which of the following factors has the least effect on the oil consumption of a specific engine?
Mechanical efficiency.
- How is the oil collected by the piston oil ring returned to the crankcase?
Through holes drilled in the piston oil ring groove.
- Which of the following lubrication system components is never located between the pressure pump and the engine pressure system?
Fuel line for oil dilution system.
- As an aid to cold weather starting, the oil dilution system thins the oil with?
Gasoline.
- The basic oil pressure relief valve setting for a newly overhauled engine is made?
In the overhaul shop.
- Where is the oil temp bulb located on a dry sump reciprocating engine?
Oil inlet line.
- Cylinder walls are usually lubricated by?
Splashed or sprayed oil.
- Oil accumulation in the cylinders of an inverted inline engine and in the lower cylinders of a radial engine is normally reduced or prevented by?
Extended cylinder skirts.
- What determines the min particle size which will be excluded or filtered by a CUNO filter?
The spacer thickness.
- What is the primary purpose of the hopper located in the oil supply tank of some dry sump engine installations?
To reduce the time required to warm the oil to operating temps.
- The purpose of the flow control valve in a reciprocating engine oil system is to?
Direct oil through or around the oil cooler.
- Where are sludge chambers, when used in aircraft engine lubrication systems, usually located?
In the crankshaft throws.
- Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by?
Oil control rings on the pistons.
- In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount?
Engine oil below normal operating temp.
- In order to maintain a constant oil pressure as the clearances between the moving parts of an engine increase through normal wear, the supply pump output?
Remains relatively constant at a given RPM with less oil being returned to the pump inlet by the relief valve.
- The valve assemblies of opposed reciprocating engines are lubricated by means of a?
Pressure system.
- What will result if an oil filter becomes completely blocked?
Oil will flow at the normal rate through the system.
- How are the piston pins of most aircraft engines lubricated?
By oil which is sprayed or thrown by the master or connecting rods.
- An engine lubrication system pressure relief valve is usually located between the?
Pump and internal oil system.
- Under which of the following conditions is the oil cooler flow control valve open on a reciprocating engine?
When the temp of the oil returning from the engine is too low.
- The purpose of a relief valve installed in the tank venting system of a turbine engine oil tank is to?
Prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet.
- In a reciprocating engine, oil is directed from the pressure relief valve to the inlet side of the?
Pressure pump.
- If the oil in the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler?
Surge protection valve.
- The primary source of oil contamination in a normally operating reciprocating engine is?
Combustion deposits due to combustion chamber blow by and oil migration on the cylinder walls.
- A drop in oil pressure may be caused by?
Foreign material under the relief valve.
- The main oil filters strain the oil at which point in the system?
Just as it leaves the pressure pump.
- Which of the following prevents oil from entering the main accessory case when the engine is not running?
Check valve.
- An oil tank having a capacity of 5 gallons must have an expansion space of?
2 quarts.
- Why is expansion space required in an engine oil supply tank?
For oil enlargement and collection of foam.
- The purpose of a dwell chamber in a turbine engine oil tank is to provide?
Separation of entrained air from scavenged oil.
- Which of the following bearing types must be continuously lubricated by pressure oil?
Plain.
