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Powerplant Textbook Questions > Lubricating systems: Recip and Turbine > Flashcards

Lubricating systems: Recip and Turbine Flashcards

1
Q

Six functions of the lubricating system in a reciprocating system

A 
Reduce friction
Seals and Cushions
Removes heat
Cleans the inside of the engine
Protests against corrosion
Preforms hydraulic action
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2
Q

When two surfaces are separated by a film of oil, the only friction between the parts is the __________ of the oil.

A

Internal friction

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3
Q

Most of the heat in a reciprocating engine comes from the __________ and the __________.

A

Piston

Cylinder walls

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4
Q

The underside of the piston head is __________ to increase the surface area from which the oil can absorb heat.

A

Finned

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5
Q

The oil that absorbs heat from the cylinder walls is oil that has been sprayed from the crankshaft at the __________.

A

Connecting rod bearings

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6
Q

When an engine remains out of service for an extended period of time, the cylinder walls should be protected with a special __________.

A

Preservative oil

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7
Q

Four basic lubricants used to reduce friction between moving parts are:

A

Animal
Vegetable
Mineral
Synthetic

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8
Q

One of the problems with using animal-based lubricants in aircraft engines is that the become __________ at high temperatures.

A

Chemically unstable

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9
Q

Two bases used in aircraft engines are:

A

Paraffinic

Naphthenic

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10
Q

Six types of oil that are of or have been used in aircraft engines are:

A 
Straight mineral
Metallic-ash detergent
Ashless-dispersant
Multiviscosity
Synthetic
Semisynthetic
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11
Q

The type of oil recommended by most engine manufactures for use during initial break-in periods is __________ oil.

A

Straight mineral

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12
Q

Detergent oils __________ (are/are not) one of the more popular lubricants for use in modern aircraft engines.

A

Are not

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13
Q

The most popular lubricating oil for use in aircraft engines is a/an __________ oil.

A

Ashless dispersant

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14
Q

The measure of opposition of a liquid to flow is called its __________.

A

Viscosity

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15
Q

The measure of the relationship between the change in viscosity of a liquid to a change in temperature is the __________ of the liquid.

A

Viscosity index

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16
Q

An oil with a high viscosity index changes its viscosity very __________ with a change in tempreture.

A

Little

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17
Q

A multiviscosity oil is one that has a/an __________ additive mixed with it.

A

Viscosity index improver

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18
Q

Two advantages of synthetic oil for use in reciprocating engines are:

A

Superior resistance to oxidation

Low internal friction

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19
Q

The type of lubricant needed when there is high tooth pressure, or a high rubbing velocity is a/an __________ lubricant.

A

Extreme pressure

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20
Q

Heat that is picked up from inside the engine is given up to the outside air that passes through the __________.

A

Oil cooler

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21
Q

It __________ (is/is not) a recommended procedure to mix automotive oil with aviation oil if they have the same SAE number.

A

Is not

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22
Q

It ___________ (is/is not) a recommended procedure to use turbine engine oil in a reciprocating engine

A

Is not

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23
Q

The number of seconds required for exactly 60 cubic centimeters of a heated oil to flow through a calibrated orifice in a viscosimeter is the __________ of the oil at that temperature.

A

SSU viscosity

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24
Q

The SSU viscosity of a lubricating oil as measured at 210 degrees F is used as the basis for the __________ rating of the oil.

A

Commercial aviation

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25
Q

Two types of lubricating systems based on the oil supply storage are:

A

Wet sump

Dry sump

26
Q

The oil supply is carried inside an engine in a __________-sump engine

A

Wet

27
Q

The oil pump in a dry sump engine that has the greater capacity is the __________ pump.

A

Scavenger

28
Q

The oil cooler in a dry sump engine is installed between the __________ and ___________.

A

Scavenger pump

Oil tank

29
Q

The oil tank in a dry sump engine is vented to the outside air through the__________.

A

Crank case

30
Q

The crankcase of a reciprocating engine is vented to outside air through a/an __________.

A

Breather

31
Q

The wrist pins are lubricated by __________ lubrication

A

Spray

32
Q

The desired oil pressure in an engine lubricating system is maintained by a __________.

A

Pressure relief valve

33
Q

When oil temperature is low the thermostatic bypass valve is ___________.

A

Open

34
Q

Oil is used to lubricate rocker arms and valve stems is carried to the rocker boxes through hollow __________.

A

Push rods

35
Q

The oil pump used in an aircraft reciprocating engine is a __________-displacement pump

A

Constant

36
Q

Two types of oil pumps used in reciprocating engine lubricating systems are:

A

Spur gear

Gerotor

37
Q

In a spur gear oil pump, the oil moves through the pump __________ the gears.

A

Around

38
Q

A gerotor pump, __________ (is/is not) a type of gear pump.

A

Is

39
Q

SAE 40 engine oil has the same viscosity of commercial aviation grade __________ oil.

A

80

40
Q

An ideal engine lubricating oil is one with as __________ a viscosity as possible consistent with high film strength.

A

Low

41
Q

The temperature which an oil gives off enough vapors to ignite in a flash but not continue to burn when a small flame is passed above it, is called the __________ of the oil

A

Flash point

42
Q

The temperature at which wax first become visible in an oil is called the __________ of oil

A

Cloud point

43
Q

A constant displacement oil pump __________ (does/does not) require a pressure relief valve.

A

Does

44
Q

When the pressure produced by an oil pump is greater than that held by the pressure relief valve, the excess oil is returned to the __________.

A

Sump

45
Q

When the clearance between the bearings in a reciprocating engine increases due to wear, the oil flow through the bearings increases. the outer volume of the pump __________ (does/does not) increase to provide greater flow.

A

Does not

46
Q

A compensated oil relief valve uses a thermostatic valve to __________ the oil pressure when the oil is cold.

A

Increase

47
Q

The initial setup of an oil pressure relief valve for a newly overhauled engine is made in the __________.

A

overhaul shop

48
Q

A surge protection valve in a large engine oil cooler protects the oil cooler from damage when the oil is too __________

A

Cold

49
Q

The oil tank used with a dry sump lubrication systerm is vented to the outside air through the engine __________.

A

Crank case

50
Q

the oil warm up time for an engine having a large volume oil tank is increased by having a/an __________ installed inside the tank.

A

Hopper

51
Q

When an aircraft is operated in extremely cold weather conditions, the oil may be diluted with __________ to make the engine easy to start.

A

Gasoline

52
Q

When engine oil that has been diluted with gasoline warms up, the gasoline is removed by __________.

A

Evaporation

53
Q

Two basic types of oil filter arrangements are:
__________
__________

A

Full flow

Bypass

54
Q

Oil tanks equipped with a Hydromatic feathering propeller have two outlets foe the oil. the outlet at the bottom of the tank goes to the __________.

A

Propeller feathering pump

55
Q

The more common type of oil filter arrangement used in aircraft reciprocating engines is the __________ filter.

A

Full flow

56
Q

The size of contaminates that can be trapped by a Cuno filter is determined by the thickness of the

A

Spacers

57
Q

Most modern aircraft reciprocating engines use __________ oil filters

A

Disposable

58
Q

Two instruments relating to the engine lubrication system required for an air-cooled aircraft engine are:
__________
__________

A

Oil pressure gauge

Oil temperature gauge

59
Q

Pulsations in the oil pressure gage indication are minimalized by the use of a/an __________ in the oil line to the engine.

A

Restricted fitting

60
Q

The oil pressure line between the engine and the oil pressure gage is filled with __________ or ___________.

A

Light weight oil

Kerosine

61
Q

Most electrical oil temperature measuring instrument are of the ___________ type.

A

Resistance change

62
Q

The oil temperature shown on the instrument in the cockpit is the temperature of the oil as it __________ the engine.

A

Enters

Powerplant Textbook Questions (5 decks)

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