ENGINE LUBRICATION PART 2

Where is the oil of a dry sump reciprocating engine exposed to the temperature control valve sensing unit?. Oil cooler inlet. Engine outlet. Engine inlet.

If an oil filter element becomes completely clogged, the. oil flow to the engine will be restricted. oil will be bypassed back to the oil tank. bypass valve will open, and the oil pump will supply unfiltered oil.

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

Upon what quality or characteristic of a lubricating oil is its viscosity index based?. Its resistance to flow at a standard temperature as compared to high grade paraffin-base oil at the same temperature. Its rate of change in viscosity with temperature change. Its rate of flow through an orifice at a standard temperature.

In an axial-flow turbine engine, compressor bleed air is sometimes used to aid in cooling the. fuel. inlet guide vanes. turbine, vanes, blades, and bearings.

Which of the following bearing types must be continuously lubricated by pressure oil?. Ball. Roller. Plain.

In a reciprocating engine oil system, the temperature bulb senses oil temperature. at a point after the oil has passed through the oil cooler. while the oil is in the hottest area of the engine. immediately before the oil enters the oil cooler.

Where is the oil temperature bulb located on a dry sump reciprocating engine?. Oil inlet line. Oil cooler. Oil outlet line.

Which of the following is a function of the fuel/oil heat exchanger on a turbojet engine?. Aerates the fuel. Emulsifies the oil. Increases fuel temperature.

Which of the following lubrication system components is never located between the pressure pump and the engine pressure system?. Oil temperature bulb. Fuel line for oil dilution system. Check valve.

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 strength. An oil that combines high viscosity and low demulsibility. An oil that combines a low viscosity index and a high neutralization number.

Which of the following helps determine the proper grade of oil to use in a particular engine?. Adequate lubrication in various attitudes of flight. Positive introduction of oil to the bearings. Operating speeds of bearings.

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 pressure. Decreased oil temperature. Insufficient lubrication.

The purpose of directing bleed air to the outer turbine case on some engines is to. provide optimum turbine blade tip clearance by controlling thermal expansion. provide up to 100 percent kinetic energy extraction from the flowing gases. allow operation in a thermal environment 600 to 800°F above the temperature limits of turbine blade and vane alloys.

Cylinder walls are usually lubricated by. splashed or sprayed oil. a direct pressure system fed through the crankshaft, connecting rods, and the piston pins to the oil control ring groove in the piston. oil that is picked up by the oil control ring when the piston is at bottom center.

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 pumping capacity of the scavenger pump in a dry sump aircraft engine's lubrication system. is greater than the capacity of the oil supply pump. is less than the capacity of the oil supply pump. is usually equal to the capacity of the oil supply pump in order to maintain constant oiling conditions.

Which of the following statements is true?. Gas turbine and reciprocating engine oils can be mixed or used interchangeably. Most gas turbine engine oils are synthetic. Most gas turbine engine oils are straight mineral or ashless dispersant.

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

The viscosity of a liquid is a measure of its. resistance to flow. rate of change. weight or density.

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

In a reciprocating engine, oil is directed from the pressure relief valve to the inlet side of the. scavenger pump. oil temperature regulator. pressure pump.

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.

High tooth pressures and high rubbing velocities, such as occur with spur-type gears, require the use of. an EP lubricant. straight mineral oil. metallic ash detergent oil.

What type of oil do most engine manufacturers recommend for new reciprocating engine break-in?. Ashless dispersant oil. Straight mineral oil. Semi-synthetic oil.

As an aid to cold-weather starting, the oil dilution system thins the oil with. kerosene. alcohol. gasoline.

Which of the following factors has the least effect on the oil consumption of a specific engine?. Mechanical efficiency. Engine RPM. Lubricant characteristics.

What is the primary purpose of the oil breather pressurization system that is used on turbine engines?. Prevents foaming of the oil. Allows aeration of the oil for better lubrication because of the air/oil mist. Provides a proper oil spray pattern from the main bearing oil jets.

What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure?. Oil pressure relief valve. Oil viscosity valve. Oil pump.

Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to. prevent overservicing. help dilute and neutralize any contaminants that may already be present in the engine's oil system. provide a better indication of any oil leaks in the system.

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.