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Aircraft Maintenance > Lubrication System > Flashcards

Lubrication System Flashcards

1
Q

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?

A

the oil pressure will be lower than normal

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2
Q

(1) Gas turbine and reciprocating engine oils can be mixed or used interchangeably.
(2) Most gas turbine engine oils are synthetic.
Regarding the above statements,

A

only No. 2 is true

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3
Q

An oil separator is generally associated with which of the following?

A

engine driven vacuum pump

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4
Q

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

A

viscosity

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5
Q

Upon what quality or characteristic of a lubricating oil is its viscosity index based?

A

its rate of change in viscosity with temperature change

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6
Q

Lubricating oils with high viscosity index ratings are oils

A

in which viscosity does not vary with temperature

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7
Q

Compared to reciprocating engine oils, the types of oils used in turbine engines. Have less tendency to produce lacquer or coke .The oil used in reciprocating engines has a relatively high viscosity due to

A

large clearances and high operating temperatures

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8
Q

If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication?

A

the thinnest oi; that will stay in place and maintain a reasonable film strength

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9
Q

In addition to lubricating (reducing friction between moving parts), engine oil performs what functions?
1. Cools.
2. Seals.
3. Cleans.
4. Prevents corrosion.
5. Cushions impact (shock) loads.

A

1,2,3,4,5

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10
Q

Which of these characteristics is desirable in turbine engine oil?

A

high flash point

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11
Q

The viscosity of a liquid is a measure of its

A

resistance flow

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12
Q

What type of oil system is usually found on turbine engines?

A

dry sump, pressure and spray

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13
Q

Which of the following factors helps determine the proper grade of oil to use in a particular engine?

A

operating speeds of bearings

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14
Q

Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of

A

distilled water at a specific temperature

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15
Q

Which of the following has the greatest effect on the viscosity of lubricating oil?

A

temperature

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16
Q

What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?

A

chemical stability

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17
Q

The recommended aircraft engine lubricants are

A

mineral or synthetic based

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18
Q

High tooth pressures and high rubbing velocities, such as occur with spur-type gears, require the use of

A

an EP lubricant

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19
Q

Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to

A

prevent over servicing

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20
Q

What type of oil do most engine manufacturers recommend for new reciprocating engine break-in?

A

Straight mineral oil

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21
Q

What type of oil do most engine manufacturers recommend after new reciprocating engine break-in?

A

Straight mineral oil

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22
Q

The type of oil pumps most commonly used on turbine engines are classified as

A

positive displacement

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23
Q

As a general rule, the mixture setting on a reciprocating engine operating at or near takeoff power that provides the best cooling is

A

full rich

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24
Q

The engine oil temperature regulator is usually located between which of the following on a dry sump reciprocating engine?

A

the scavenger pump outlet and the oil storage tank

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25
Q

What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates?

A

the return oil will be pump overboard

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26
Q

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

A

lower than the pressure pump capabilities

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27
Q

(1) Fuel may be used to cool oil in gas turbine engines.
(2) Ram air may be used to cool oil in gas turbine engines.
Regarding the above statements,

A

both NO.1 and No. 2 are true

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28
Q

In a reciprocating engine oil system, the temperature bulb senses oil temperature

A

at a point after the oil passed through the oil cooler

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29
Q

The oil dampened main bearing utilized in some turbine engines is used to

A

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

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30
Q

What is the purpose of the last chance oil filters?

A

to filter the oil immediately before it enters the main bearings

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31
Q

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

A

oil through the heat exchanger

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32
Q

What prevents pressure within the lubricating oil tank from rising above or falling below ambient pressure (reciprocating engine)?

A

oil tank vent

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33
Q

In an axial-flow turbine engine, compressor bleed air is sometimes used to aid in cooling the

A

turbine, vanes, blades, and bearings

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34
Q

Oil picks up the most heat from which of the following turbine engine components?

A

turbine bearing

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35
Q

Which of the following is a function of the fuel-oil heat exchanger on a turbojet engine?

A

increases fuel temperature

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36
Q

According to Federal Aviation Regulations, oil tank fillers on turbine engines must be marked with the word

A

‘oil’

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37
Q

Oil tank fillers on reciprocating engines are marked with the word

A

“oil” in accordance with 14 CFR part 23

38
Q

After making a welded repair to a pressurized-type turbine engine oil tank, the tank should be pressure checked to

A

not less than 5 PSI the maximum operating of the tank

39
Q

Why are fixed orifice nozzles used in the lubrication system of gas turbine engines?

A

To provide a relatively constant oil flow to the main bearings at all engine speeds

40
Q

Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their presence by

A

bridging the gap between the detector center (positive) electrode and the ground electrode

41
Q

What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine?

A

insufficient lubrication

42
Q

What is the primary purpose of the oil-to-fuel heat exchanger?

A

cool the oil

43
Q

What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure?

A

oil pressure relief valve

44
Q

Low oil pressure can be detrimental to the internal engine components. However, high oil pressure

A

should be limited to the engine manufacturer’s recommendations

45
Q

What is the primary purpose of the oil breather pressurization system that is used on turbine engines?

A

provides a oil spray pattern from the main bearing oil jets

46
Q

The purpose of directing bleed air to the outer turbine case on some engines is to

A

provides optimum turbine blade tip clearance by controlling thermal expansion

47
Q

Some larger reciprocating engines use a compensating oil pressure relief valve to

A

provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warms
up.

48
Q

In order to relieve excessive pump pressure in an engine’s internal oil system, most engines are equipped with a

A

relief valve

49
Q

What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine?

A

piston and cylinder walls

50
Q

How are the teeth of the gears in the accessory section of an engine normally lubricated?

A

by splashed or sprayed oil

51
Q

What is the purpose of the check valve generally used in a dry sump lubrication system?

A

to prevent the oil from the supply tank from seeping into the crankcase during inoperative periods

52
Q

From the following, identify the factor that has the least effect on the oil consumption of a specific engine.

A

mechanical efficiency

53
Q

How is the oil collected by the piston oil ring returned to the crankcase?

A

Through holes drilled in the piston oil ring groove

54
Q

Which of the following lubrication system components is never located between the pressure pump and the engine pressure system?

A

fuel line for oil dilution system

55
Q

As an aid to cold-weather starting, the oil dilution system thins the oil with

A

gasoline

56
Q

The basic oil pressure relief valve setting for a newly overhauled engine is made

A

In the overhaul shop

57
Q

Where is the oil temperature bulb located on a dry sump reciprocating engine?

A

Oil inlet line

58
Q

Cylinder walls are usually lubricated by

A

splashed or sprayed oil

59
Q

If a full-flow oil filter is used on an aircraft engine, and the filter becomes completely clogged, the

A

bypass valve will open and the oil pump will supply unfiltered oil to the engine

60
Q

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

A

extended cylinder skirts

61
Q

What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods?

A

the oil becomes contaminated with moisture, acids, and finely divided suspended solid particles

62
Q

What determines the minimum particle size which will be excluded or filtered by a cuno-type (stacked disc, edge filtration) filter?

A

the spacer thickness

63
Q

What is the primary purpose of the hopper located in the oil supply tank of some dry sump engine installations?

A

to reduce the time required to warm the oil operating temperature

64
Q

The purpose of the flow control valve in a reciprocating engine oil system is to

A

direct oil through or around the oil cooler

65
Q

Where are sludge chambers, when used in aircraft engine lubrication systems, usually located?

A

in the crankshaft throws

66
Q

Why is an aircraft reciprocating engine oil tank on a dry sump lubrication system equipped with a vent line?

A

to prevent pressure buildup in the oil tank

67
Q

Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by

A

oil control rings on the pistons

68
Q

(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,

A

only No. 2 is true

69
Q

The pumping capacity of the scavenger pump in a dry sump aircraft engine’s lubrication system

A

is greater than the capacity of the oil sump

70
Q

In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount?

A

engine oil below normal operating temperature

71
Q

Remains relatively constant (at a given RPM) with less oil being returned to the pump inlet by the relief valve. The valve assemblies of opposed reciprocating engines are lubricated by means of a

A

pressure system

72
Q

What will result if an oil filter becomes completely blocked?

A

oil will flow at the normal rate through the system

73
Q

A turbine engine dry sump lubrication system of the self-contained, high-pressure design

A

consists of pressure, breather and scavenge subsystems

74
Q

Lube system last chance filters in turbine engines are usually cleaned

A

during overhaul

75
Q

How are the piston pins of most aircraft engines lubricated?

A

by oil which is sprayed or thrown by the master or connecting rods

76
Q

The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits

A

the oil tank to be vented through the normal engine vent

77
Q

An engine lubrication system pressure relief valve is usually located between the

A

pump and the internal oil system

78
Q

Where is the oil of a dry sump reciprocating engine exposed to the temperature control valve sensing unit?

A

oil cooler inlet

79
Q

Under which of the following conditions is the oil cooler flow control valve open on a reciprocating engine?

A

When the temperature of the oil returning from the engine is too low

80
Q

The purpose of a relief valve installed in the tank venting system of a turbine engine oil tank is to

A

prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet

81
Q

In a reciprocating engine, oil is directed from the pressure relief valve to the inlet side of the

A

pressure pump

82
Q

If the oil in the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler?

A

surge protection valve

83
Q

The primary source of oil contamination in a normally operating reciprocating engine is

A

combustion deposits due to combustion chamber blow-by and oil migration on the cylinder walls

84
Q

A drop in oil pressure may be caused by

A

foreign material under the relief valve

85
Q

The main oil filters strain the oil at which point in the system?

A

just as it leaves the pressure pump

86
Q

Which type valve prevents oil from entering the main accessory case when the engine is not running?

A

check

87
Q

An oil tank having a capacity of 5 gallons must have an expansion space of

A

2 quarts

is considered to be the result of normal wear

88
Q

Why is expansion space required in an engine oil supply tank?

A

for oil enlargement and collision of foam

89
Q

The purpose of a dwell chamber in a turbine engine oil tank is to provide

A

separation of entrained air from scavenged oil

90
Q

Which of the following bearing types must be continuously lubricated by pressure oil?

A

plain

Aircraft Maintenance (9 decks)

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