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Flashcards in Fluids Deck (102)
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1

Substance capable of reducing friction, heat, and wear when introduced as a film between moving parts

Lubricant

2

Three basic types of lubricant

Dry (graphite)
Wet
Mineral-based

3

Five characteristics of lubricants

Viscosity
Viscosity index
Pour point
Flash point
Fire point

4

Measure of the oil's internal friction or resistance to flow

Viscosity

5

Indicates the influence of temperature on a particular type of oil

Viscosity index

6

Lowest temperature at which the lubricant will flow from a container

Pour point

7

Most lube oils have a natural pour point of ranging from

10 - 25 degrees F

8

Minimum temperature at which the lubricant will give off a sufficient quantity of vapor to ignite when exposed to an open flame

Flash point

9

Minimum temperature at which the lubricant will give off a sufficient quantity of vapor to ignite and continue to burn when exposed to an open flame

Fire point

10

The fire point of a lubricant ranges from approximately _____ higher than the flash point

10 - 70 degrees F

11

Encourage foam to dissipate rapidly in oil

Anti-foam additives

12

The products of oxidisation include

Organic acids
Oxy-hydrocarbons

13

Clean the engine and minimise the amount of harmful sludge deposits

Detergent additives

14

Allow the lube oil to meet two or more viscosity levels

Viscosity index improvers

15

Four causes of lube oil contamination

Fuel dilution
Acid contamination
Water
Insolubles

16

Naval engineering manual, COMDTINST M9000.6 (series), identifies that viscosity limits of ___ increase and ___ fuel dilution are allowable

40%
5%

17

Identifies the viscosity limits of lube oil

Naval Engineering Manual, COMDTINST M9000.6 (series)

18

Occurs during combustion when sulfur is in the fuel

Acid contamination

19

Water contamination in a used oil sample indicate ___

Adverse operating conditions or a coolant leak

20

Three products of oxidation

Sludge
Varnish
Acids

21

Oxidation results from a combination of ___

High temperatures
Constant mixing with blowby gasses
Air in contact with metal surfaces

22

Two methods of shipboard oil testing

Visage viscosity comparator
Gerin falling ball comparator DCA 300 test kit

23

Engine lube oil may increase in acidity due to combustion byproducts containing ____

Nitrogen and sulfur

24

What colour on the acid test indicates a satisfactory acidity level in the oil?

Blue

25

What colour on the acid test indicates too high of an acidity level

Yellow or green

26

Method by which metals in a fluid are measured in ppm

Spectrometric analysis

27

Units that submit oil samples for laboratory analysis will take samples how often?

Every 250 hours or quarterly

28

Which units must submit oil samples for laboratory analysis?

Cutters 65 and longer

29

Newly overhauled engines shall have oil samples drawn and submitted after ___

1, 25, and 50 hours

30

Upon striking aboard new oil, submit a new oil sample from the storage tank to the testing facility ___

As soon as possible