ENGINE LUBRICATION PART 3

After making a welded repair to a pressurized-type turbine engine oil tank, the tank should be pressure checked to. not less than 5 psi plus the maximum operating pressure of the tank. not less than 5 psi plus the average operating pressure of the tank. 5 psi.

How is oil cooled in gas turbine engines?. Fuel may not be used to cool oil in gas turbine engines. Ram air may not be used to cool oil in gas turbine engines. Ram air may be used to cool oil in gas turbine engines.

Which of the following statements is true?. Wet sump oil systems are most commonly used in gas turbine engines. In most turbine engine oil tanks, a slight pressurization of the tank is not desired to ensure a positive flow of oil. Dry sump oil systems are most commonly used in gas turbine engines.

The oil used in reciprocating engines has a relatively high viscosity due to. the reduced ability of thin oils to maintain adequate film strength at altitude (reduced atmospheric pressure). the relatively high rotational speeds. large clearances and high operating temperatures.

What determines the minimum particle size which will be excluded or filtered by a CUNO (stacked disc, edge filtration) filter?. The disc thickness. The spacer thickness. Both the number and thickness of the discs in the assembly.

What prevents pressure within the lubricating oil tank from rising above or falling below ambient pressure (reciprocating engine)?. Oil tank check valve. Oil pressure relief valve. Oil tank vent.

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. LEAN. FULL LEAN.

Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of. oil at a specific temperature. distilled water at a specific temperature. mercury at a specific temperature.

The type of oil pumps most commonly used on turbine engines are classified as. positive displacement. variable displacement. constant speed.

In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount?. Engine oil above normal operating temperature. Engine oil below normal operating temperature. Engine stopped with no oil flowing after runup.

What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?. Cooling ability. Chemical stability. Friction resistance.

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. maintain internal tank air pressure at the ambient atmospheric level regardless of altitude or rate of change in altitude. maintain a positive internal pressure in the oil tank after shutdown to prevent oil pump cavitation on engine start.

What will be the result of operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature?. The oil pressure will be higher than normal. The oil temperature and oil pressure will be higher than normal. The oil pressure will be lower than normal.

The purpose of the flow control valve in a reciprocating engine oil system is to. direct oil through or around the oil cooler. compensate for volumetric increases due to foaming of the oil. deliver cold oil to the hopper tank.

According to the Federal Aviation Regulations, oil tank fillers on turbine engines must be marked with the word. 'oil' and the type and grade of oil specified by the manufacturer. 'oil' and tank capacity. 'oil.'.

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 pump inlet pressure. lower than the pressure pump capabilities. higher than pressure pump capabilities.

The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits. pressurization of the oil supply to prevent cavitation of the oil supply pump. oil vapors from the engine to be condensed and drained into the oil supply tank. the oil tank to be vented through the normal engine vent.

What type of oil system is usually found on turbine engines?. Dry sump, pressure, and spray. Dry sump, dip, and splash. Wet sump, spray, and splash.

A turbine engine dry sump lubrication system of the self-contained, high-pressure design. has no heat exchanger. consists of pressure, breather, and scavenge subsystems. stores oil in the engine crankcase.

The basic oil pressure relief valve setting for a newly overhauled engine is made. within the first 30 seconds of engine operation. when the oil is at a higher than normal temperature to assure high oil pressure at normal oil temperature. in the overhaul shop.

How is the oil collected by the piston oil ring returned to the crankcase?. Down vertical slots cut in the piston wall between the piston oil ring groove and the piston skirt. Through holes drilled in the piston oil ring groove. Through holes drilled in the piston pin recess.

What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates?. Oil will accumulate in the engine. The return oil will be pumped overboard. The scavenger return line check valve will close and force the oil to bypass directly to the intake side of the pressure pump.

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. compensate for changes in atmospheric pressure that accompany altitude changes. automatically keep oil pressure nearly the same whether the oil is warm or cold.

A drop in oil pressure may be caused by. the temperature regulator sticking open. the bypass valve sticking open. foreign material under the relief valve.

Where are sludge chambers, when used in aircraft engine lubrication systems, usually located?. In the crankshaft throws. Adjacent to the scavenger pumps. In the oil storage tank.

An engine lubrication system pressure relief valve is usually located between the. oil cooler and the scavenger pump. scavenger pump and the external oil system. pump and the internal oil system.

What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine?. Crankshaft main bearings. Exhaust valves. Pistons and cylinder walls.

In a jet engine which uses a fuel/oil heat exchanger, the oil temperature is controlled by a thermostatic valve that regulates the flow of. fuel through the heat exchanger. both fuel and oil through the heat exchanger. oil through the heat exchanger.

In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a. vent. bypass valve. relief valve.

How are the piston pins of most aircraft engines lubricated?. By pressure oil through a drilled passageway in the heavy web portion of the connecting rod. By oil which is sprayed or thrown by the master or connecting rods. By the action of the oil control ring and the series of holes drilled in the ring groove directing oil to the pin and piston pin boss.

How are the teeth of the gears in the accessory section of an engine normally lubricated?. By splashed or sprayed oil. By submerging the load-bearing portions in oil. By surrounding the load-bearing portions with baffles or housings within which oil pressure can be maintained.