A&P Powerplant

If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication?. The thinnest oil that will stay in place and maintain a reasonable film strenght. An oil that combines high viscosity and low demulsibility. An oil that combines a low viscosity index and a high naturalization number.

Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their present by. disturbing the magnetic lines of flux around the detector tip. bridging the gap between the detector center (positive) electrode and the ground electrode. generating a small electric current that is caused by the particles being in contact with the dissimilar metal of the detector tip.

What is the primary purpose of the oil-fuel heat exchange?. Cool the fuel. Cool the oil. De-aerate the oil.

(1) Gas turbine and reciprocating engine oils can be mixed or used interchangeably. (2) Most gas turbine engine oils are synthetic. Regarding the above statement,. only No. 2 is true. only No. 1 and No. 2 are true. neither No. 1 nor No. 2 is true.

An oil tank having a capacity of 5 gallons must have an expansion space of. 2 quarts. 4 quarts. 5 quarts.

The recommended aircraft engine lubricants are. animal, mineral, or synthetic based. mineral or synthetic based. vegetal, mineral, or synthetic based.

What would be the probable result the oil system pressure relief valve should stick in he open position on a turbine engine?. Increase oil pressure. Decrease oil temperature. insufficient lubrication.

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

What is the purpose of the check valve generally used in a dry sump lubrication system?. To prevent the scavenger pump from losing its prime. To prevent the oil from the supply tank from seeping into the crankcase during inoperative periods. To prevent the oil from the pressure pump from entering the scavenger system.

Oil picks up the most heat from which of the following turbine engine components?. Rotor coupling. Compressor bearing. Turbine bearing.

The main oil filter strain the oil at which point in the system?. Immediately after it leaves the scavenger pump. Immediately before it enter the pressure pump. Just as it leaves the pressure pump.

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

Lube system last chance filters in turbine engine are usually cleaned. during annual inspection. during 100-hours inspections. during overhaul.

Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by. the design shape of the piston skirt. internal engine pressure bleeding past the ring grooves. oil control rings on the pistons.

What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods?. The oil becomes diluted with gasoline washing past the pistons into the crankcase. The oil becomes contaminated with moisture, acids, and finely divided suspended solid particles. Exposure to heat and oxygen causes a decreased ability to maintain a film under load.

The primary source of oil contamination in a normally operating reciprocating engine is. metallic deposits a result of engine wear. atmospheric dust and pollution. combustion deposits due to combustion chamber blow-by and oil migration on the cylinder walls.

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 by lower than normal.

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. increases as the resistance offered to the flow of oil increases with more oil being returned to the pump inlet by the relief valve. remains relatively constant (at a given RPM) with less oil being returned to the pump inlet by he relief valve. remains relatively constant (at a given RPM) with more oil being returned to the pump inlet by the relief valve.

An oil separator is generally associated with which of the following?. Engine-driven oil pressure pump. Engine-driven vacuum pump. Cuno oil filter.

(1) Wet sump oil systems are most commonly used in gas turbine engines. (2) In most turbine engine oil tanks, a slight pressurization of the tank is desired to ensure a positive flow of oil. Regarding the above statements. Both No. 1 and No. 2 are true. only No. 2 is true. neither No. 1 nor No. 2 is true.

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.

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 temperatures. To reduce surface aeration of the hot oil and thus reduce oxidation and the formation of sludge and varnish. To impart a centrifugal motion to the oil entering the tank so that the foreign particles in the oil will separate more readily.

Under which of the following conditions is the oil cooler flow control valve open on a reciprocating engine?. When the temperature of the oil returning from the engine is too high. When the temperature of the oil retuning from the engine is too low. When the scavenger pump output volume exceeds the engine pump input volume.

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

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

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 sunup.

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

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.

Low oil pressure can be detrimental to the internal engine components. However, high oil pressure. should be limited to the engine manufacturers recommendations. has a negligible effect. will not occur because of pressure losses around the bearing.

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.

In jet engine which uses a fuel-oil heat exchanger, the oil temperature is controlled by 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.