ENGINE LUBRICATION PART 1

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

If the oil in the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler?. Oil pressure relief valve. Airflow control valve. Surge protection valve.

What will result if an oil filter becomes completely blocked?. Oil will flow at a reduced rate through the system. Oil flow to the engine will stop. Oil will flow at the normal rate through the system.

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. To keep back pressure on the oil pump, thus preventing an air lock. To protect the oil seals by preventing excessive pressure from entering the bearing cavities.

The purpose of a dwell chamber in a turbine engine oil tank is to provide. a collection point for sediments. for a pressurized oil supply to the oil pump inlet. separation of entrained air from scavenged oil.

As a general rule, a small amount of small fuzzy particles or gray metallic paste on a turbine engine magnetic chip detector. is considered to be the result of normal wear. indicates an imminent component failure. indicates accelerated generalized wear.

Why is expansion space required in an engine oil supply tank?. To eliminate oil foaming. For oil enlargement and collection of foam. For proper oil tank ventilation.

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.

Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their presence 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 type of oil do most engine manufacturers recommend after new reciprocating engine break-in?. Metallic-ash detergent oil. Ashless dispersant oil. Straight mineral oil.

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

When servicing a turbine engine oil system, the proper type of servicing equipment and procedures can be found in the. Aircraft Information Manual (AIM). aircraft maintenance manual (MM). Type Certificate Data Sheet (TCDS).

What is the purpose of the last-chance oil filters?. To prevent damage to the oil spray nozzle. To filter the oil immediately before it enters the main bearings. To assure a clean supply of oil to the lubrication system.

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

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

Which of the following has the greatest effect on the viscosity of lubricating oil?. Temperature. Engine RPM. Oil pressure.

Oil tank fillers on reciprocating engines are marked with the word. "oil" and tank capacity, in accordance with 14 CFR Part 45. "oil," type, and grade, in accordance with 14 CFR Part 33. "oil," in accordance with 14 CFR Part 25.

The engine oil temperature regulator is usually located between which of the following on a dry sump reciprocating engine?. The engine oil supply pump and the internal lubrication system. The scavenger pump outlet and the oil storage tank. The oil storage tank and the engine oil supply pump.

Which of these characteristics is desirable in turbine engine oil?. Low flash point. High flash point. High volatility.

The time in seconds required for exactly 60 cubic centimeters of oil to flow through an accurately calibrated orifice at a specific temperature is recorded as a measurement of the oil's. flash point. specific gravity. viscosity.

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 the relief valve. remains relatively constant (at a given RPM) with more oil being returned to the pump inlet by the relief valve.

The oil dampened main bearing utilized in some turbine engines is used to. provide lubrication of bearings from the beginning of starting rotation until normal oil pressure is established. 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. dampen surges in oil pressure to the bearings.

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

Compared to reciprocating engine oils, the types of oils used in turbine engines. are required to carry and disperse a higher level of combustion byproducts. may permit a somewhat higher level of carbon formation in the engine. have less tendency to produce lacquer or coke.

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

Why is an aircraft reciprocating engine oil tank on a dry sump lubrication system equipped with a vent line?. To prevent pressure buildup in the reciprocating engine crankcase. To eliminate foaming in the oil tank. To prevent pressure buildup in the oil tank.

Which of the following prevents oil from entering the main accessory case when the engine is not running?. Pressure valve. Hydraulic fuse. Check valve.

Lubricating oils with high viscosity index ratings are oils. in which the viscosity does not vary much with temperature change. in which the viscosity varies considerably with temperature change. which have high SAE numbers.

The valve assemblies of opposed reciprocating engines are lubricated by means of a. gravity feed system. splash and spray system. pressure system.

Oil accumulation in the cylinders of an inverted in-line engine and in the lower cylinders of a radial engine is normally reduced or prevented by. reversed oil control rings. routing the valve-operating mechanism lubricating oil to a separate scavenger pump. extended cylinder skirts.

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 returning from the engine is too low. When the scavenger pump output volume exceeds the engine pump input volume.