Oil Systems Quiz for A&P Technician Propulsion

Questions and Answers

What should be done to a pressurized turbine engine oil tank after making a welded repair?

Pressure check to the manufacturer's recommended pressure

Pressure check to not less than 5 PSI plus the maximum operating pressure of the tank (correct)

Pressure check to 5 PSI

Pressure check to not less than 5 PSI plus the average operating pressure of the tank

How do ferrous metal particles in turbine engine oil cause an indicating type magnetic chip detector to indicate their presence?

By changing the magnetic field strength

By generating a small electric current

By bridging the gap between the detector center and ground electrode (correct)

By disturbing the magnetic lines of flux around the detector tip

What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine?

Increased oil flow rate

Increased oil pressure

Increased engine performance

Decreased oil temperature (correct)

What is the primary purpose of the oil to fuel heat exchanger?

To cool the fuel Signup and view all the answers

What is the primary purpose of the oil breather pressurization system?

To prevent foaming of the oil Signup and view all the answers

What type of oil system is usually found on turbine engines?

Dry sump, pressure, and spray Signup and view all the answers

How are the teeth of the gears in the accessory section of an engine normally lubricated?

By splashed or sprayed oil Signup and view all the answers

Why do manufacturers require turbine engine oil servicing within a short time after engine shutdown?

To help dilute and neutralize any contaminants in the engine's oil system Signup and view all the answers

What type of valve is used to relieve excessive pump pressure in an engine's internal oil system?

Relief valve Signup and view all the answers

What type of oil pumps are most commonly used on turbine engines?

Positive displacement Signup and view all the answers

What is the function of a scavenge filter in a gas turbine lubrication system?

To protect the pressure pump from wear particles. Signup and view all the answers

How does a gear type oil pump operate?

Oil is drawn into the pump and carried around between the gear teeth and casing. Signup and view all the answers

What is the typical relationship between oil pressure and fuel pressure in a turbine engine?

Oil pressure is usually higher than fuel pressure. Signup and view all the answers

What is the source of the working fluid in a constant speed drive (CSD)?

It is a self-contained system within the CSD unit. Signup and view all the answers

Which of the following is a potential cause of high oil temperature in a turbine engine, with no change in power setting parameters?

Engine main bearing distress. Signup and view all the answers

How is engine oil typically cooled in a turbine engine?

By a fuel/oil cooler. Signup and view all the answers

What is the purpose of the oil pressure spray jets in a turbine engine?

To lubricate the bearings and other critical components. Signup and view all the answers

What type of filters are typically used to protect oil pressure spray jets?

Mesh filters. Signup and view all the answers

What type of filter serves as a last chance filter in a turbine engine?

In-line thread filters Signup and view all the answers

How does a gyroter type oil pump work?

Oil is drawn into the pump and carried around between the gear teeth and casing. Signup and view all the answers

What is the function of the oil dampened main bearing used in some turbine engines?

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. Signup and view all the answers

What component in the oil system acts as a chip detector?

Magnetic plug in the return line Signup and view all the answers

What is the purpose of the last chance oil filters?

To prevent damage to the oil spray nozzle. Signup and view all the answers

What happens to the return oil if the oil line between the scavenger pump and the oil cooler separates?

The scavenger return line check valve will close and force the oil to bypass directly to the intake side of the pressure pump. Signup and view all the answers

Which turbine engine component is responsible for generating the most heat that is absorbed by the oil?

Turbine bearing Signup and view all the answers

What is the purpose of the fuel oil heat exchanger in a jet engine?

To heat the fuel before it enters the combustion chamber. Signup and view all the answers

What happens to the oil flow in a gear type engine oil pump at cruise RPM?

Some oil flows through the relief valve. Signup and view all the answers

What is the purpose of the thermostatic valve in a fuel oil heat exchanger?

To regulate the flow of oil through the heat exchanger. Signup and view all the answers

What component protects an oil cooler from damage if the oil inside becomes solidified?

Oil pressure relief valve Signup and view all the answers

If an oil filter becomes completely blocked, what happens to the oil flow to the engine?

Oil flow will continue at the normal rate. Signup and view all the answers

Which of the following is NOT a subsystem of a typical self-contained, high-pressure dry sump lubrication system?

Cooling Signup and view all the answers

What is the primary function of the hopper in the oil supply tank of some dry sump engine installations?

To reduce the time required to warm the oil to operating temperatures. Signup and view all the answers

What determines the minimum particle size that a Cuno-type oil filter can exclude?

The spacer thickness between the filter discs. Signup and view all the answers

In a full-flow oil lubrication system, what characterizes the oil pressure?

The oil pressure varies with throttle setting. Signup and view all the answers

How should a felt filter in an oil lubrication system be handled when it needs to be cleaned?

Replaced with a new filter element. Signup and view all the answers

What type of filter is typically found on the inlet side of an oil scavenge pump?

Wire mesh filter. Signup and view all the answers

How is the output of a vane-type oil pump controlled?

By the outlet pressure acting against a spring pressure. Signup and view all the answers

What is the primary function of the sump in a dry sump oil system?

To serve as a collecting point for oil. Signup and view all the answers

What is the purpose of an anti-surge valve in an air-cooled oil cooler?

Protect the cooler Signup and view all the answers

What feature characterizes a thread type oil seal in a lubrication system?

It has a thread on a stationary portion Signup and view all the answers

Which type of oil system is primarily used in most modern turboprop engines?

Dry sump type Signup and view all the answers

What flow and pressure characteristics does a spur gear pump exhibit in a lubrication system?

Low flow at high pressure Signup and view all the answers

During which maintenance activity are 'last chance' filters in a lubrication system serviced?

Engine overhaul Signup and view all the answers

What follows the word 'lubrication' on a lubrication fluid line for identification purposes?

Squares Signup and view all the answers

Which of the following statements regarding oil pressure relief bypass valves is accurate?

They prevent excessive pressure in the system Signup and view all the answers

What is the primary role of centrifugal force in the context of impeller function?

To direct oil flow Signup and view all the answers

Study Notes

Lubrication Systems

Oil Pressure and Flow

Oil pressure in the cooler is higher than fuel pressure.
Gear type oil pump draws oil into the pump and carries it round between the gear teeth and casing.
Scavenge filter is incorporated in a gas turbine lubrication system to protect the pressure pump.

Engine Oil Cooling and Filtering

Engine oil is usually cooled by a fuel/oil cooler.
In-line thread filters are used to protect oil pressure spray jets.
Micronic filters are used in some systems.

Oil Pumps and Systems

Gear type oil pumps and gyroter type oil pumps operate similarly, drawing oil into the pump and carrying it round between the gear teeth and casing.
A constant speed drive (CSD) has its own self-contained oil system.
A dry sump lubrication system has a pressure, breather, and scavenge subsystems.

Oil Pressure Relief and Control

The chip detector in the oil system is a magnetic plug in the return line.
The last chance oil filters are used to prevent damage to the oil spray nozzle.
Oil pressure relief valves are used to prevent over-pressurization of the system.
High oil pressure should be limited to the engine manufacturer's recommendations.

Oil Systems and Components

A dry sump lubrication system stores oil in a separate tank.
The hopper in the oil supply tank reduces the time required to warm the oil to operating temperatures.
Wire mesh filters are used in oil scavenge pumps.
Turbo-prop engines typically use dry sump type lubrication systems.

Oil Leaks and Contamination

A blocked oil filter will allow oil to flow at a normal rate through the system.
Oil leaks can be detrimental to internal engine components.
Ferrous metal particles in turbine engine oil can cause an electrical indicating type magnetic chip detector to indicate their presence.

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Description

This quiz covers oil systems in aircraft propulsion, including oil coolers and filters. Based on the Jeppesen A&P Technician Propulsion textbook.

A&P Technician Propulsion: Oil Systems Quiz