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Flashcards in Lubrication Deck (27)
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1
Q

__________ _____ is better at keeping particles in suspension (break in point)

A

Mineral Oil

2
Q

When starting in cold temperatures, what could you do to decrease the viscosity of the oil?

A

Pre-Heat Oil Fuel Dilution

3
Q

_______ is a liquid’s resistance to flow

A

Viscosity

4
Q

Viscosity is measured using a _________ ___________ _____________

A

Saybolt Universal Viscosimeter

5
Q

________ _______ is the temperature at which the chemicals normally suspended in the oil begin to solidify/separate into crystals

A

Cloud Point

6
Q

______ _____ is the temperature at which oil emits fumes

A

Flash Point

7
Q

______ _____ is the temperature where there is enough fumes for combustion

A

Fire Point

8
Q

Mineral Oil tends to _______ when heavily contaminated

A

sludge

9
Q

More commonly used oil are ____________ ____________ oils

A

Ashless Dispersant

10
Q

_______-_________ oils allows operation in a wide temp range

A

Multi-Viscosity

11
Q

_____ sump oil system is where most oil control elements are contained within the engine

A

Wet

12
Q

_____ sump oil system is where oil is stored outside the engine in a tank, and requires a scavenge pump

A

Dry

13
Q

What type of pump is usually used to deliver oil to the pressure system?

A

Constant displacement EDP

14
Q

The pressure relief valve can be ___________ or ________

A

adjustable fixed

15
Q

How is an adjustable pressure relief valve actuated?

A

Spring with a ball/dome

16
Q

How is a fixed pressure relief valve actuated?

A

Adding/removing washers

17
Q

What kind of oil filters are there?

A

Full flow, bypass/partial flow

18
Q

In an engine during a cold start, before oil comes to temperature, how is the oil kept from the cooling system?

A

Oil is bypassed around the cooler using a bypass valve (vernotherm valve). Then as the valve heats up, it expands and closes.

19
Q

Oil separator is used with which kind of air pumps?

A

Wet-type

20
Q

Large Radial engines use this system, adding small amounts of fuel to the oil before shutdown, allowing for less viscous oil for the next startup in cold temperatures.

A

Oil dilution sysem

21
Q

Other aircraft engines use ___-________ to heat up oil

A

Pre-heaters

22
Q

What does oil provide for engines?

A

Sealing, cooling, cleaning, actuation, corrosion prevention, lubrication

23
Q

The Higher the number on the oil part number =?

A

Thicker fluid/High viscosity fluid

24
Q

In Multi-Viscosity Oils, what does the first number represent?

A

Viscosity at Low temperatures

25
Q

What kind of bypass valves are there for an oil cooler?

A

Pressure, temperature

26
Q

What is the most common type of oil pump?

A

Gear pump

27
Q

When do you use Mineral oil?

A

During the break-in period if an engine