19 Gas Turbines Lubrication – LMS

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📄 Notes ⚡ Cheat Sheet

Q1. Labyrinth seals in the lubrication system of a gas turbine engine are designed to provide a seal that is:

not completely tight, allowing only some radial movement between rotating and static parts.

not completely tight, allowing some movement between rotating and static parts.

completely tight, allowing some axial movement between rotating and static parts.

completely tight, allowing no movement between rotating and static parts.

Q2. The fuel-oil heat exchanger:

cools both the oil and the fuel.

heats the fuel only.

cools the oil only.

cools the oil and heats the fuel.

Q3. In a gas turbine engine lubrication system fitted with an “oil-to-fuel” heat exchanger, the:

Oil is cooled through thermal exchange with the fuel

Oil is heated through thermal exchange with the fuel

Fuel is heated as required whenever fuel filter clogging is detected

Fuel is cooled to prevent vapor locking interrupting the fuel supply to the nozzles

Q4. If a gas turbine engine fuel/oil heat exchanger is located downstream of the HP fuel pump, internal leakage of the heat exchanger will cause the oil level to:

rise and the fuel nozzles eventually to become clogged.

fall.

fall and the oil jets eventually to become clogged.

rise.

Q5. The oil system of a gas turbine engine may be fitted with magnetic plugs, or chip detectors, that:

Dispense with the requirement to fit an oil filter

Monitor oil pressure and oil temperature

Provide warning of impending failure without having to remove the filters for inspection

Are fitted in the pressure line upstream of the oil filter

Q6. The purpose of a chip detector in the oil system of an engine/gearbox is to indicate that:

the piston rings are worn.

the seals are worn.

the oil temperature is too high.

there are metal particles in the oil.

Q7. The oil system of a gas turbine engine may be fitted with magnetic plugs, or chip detectors, that:

provide warning of impending failure without having to remove the filters for inspection.

are fitted in the pressure line upstream of the oil filter.

monitor oil pressure and oil temperature.

dispense with the requirement to fit an oil filter.

Q8. The oil supply to gas turbine engine bearings is maintained in the event of the main oil filter becoming clogged by:

differential pressure opening the bypass valve of the main oil filter.

the scavenge pumps.

a back-up oil system.

the HP fuel pump.

Q9. The primary reason for venting an engine oil tank is to:

cool the oil.

prevent excessive pressure in the tank.

prevent overflow.

allow for expansion of hot oil.

Q10. One of the causes of high oil temperature in a gas turbine engine at constant power setting is:

high oil pressure.

high outside air temperature.

malfunction of the heat exchanger.

unusually high scavenge pump oil flow.

Q11. A pressure relief valve in an oil system that does not seat correctly could result in:

high oil pressure

low oil pressure

excessive oil consumption

low oil temperature

Q12. If the main oil filter of a gas turbine engine becomes clogged, oil to the main bearings is still assured:

because fuel upstream of the oil filter will be mixed with oil to allow easier passage through the filter.

if a higher engine rpm is selected to increase oil pressure.

if breather pressure in the main compartments is increased to ensure positive lubrication of the bearings.

because the oil filter bypass valve opens.

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