Book 2: 6-30 - "Lubrication"

Question 1

If oil has a high viscosity index (VI), this indicates that its viscosity:
Select one:

A. Changes little with pressure change

B. Changes greatly with temperature change

C. Does not changes with temperature change

D. Changes greatly with pressure change

E. Changes little with temperature change

Answer 1

E. Changes little with temperature change

Question 2

Lubricants are frequently used to provide sealing between:
Select one:

A. Screws and cylinder walls

B. Lobes and cylinder walls

C. Stationary and moving blades

D. Impellers and casing walls

E. Piston and cylinder walls

Answer 2

E. Piston and cylinder walls

Question 3

Materials that are used as solid lubricants include all of the following except:
Select one:

A. Soapstone

B. Petroleum oil

C. Graphite

D. Molybdenum disulphide

E. Mica

Answer 3

B. Petroleum oil

Question 4

The pour point of oil is the _____ at which the oil will flow.
Select one:

A. Highest temperature

B. Lowest pressure

C. Lowest viscosity

D. Lowest temperature

E. Highest pressure

Answer 4

D. Lowest temperature

Question 5

One of the general classes of lubricants is the:
Select one:

A. Oil

B. Liquid

C. Semi-liquid

D. Gas

E. Grease

Answer 5

B. Liquid

Question 6

In cases where surfaces come together with some impact, as with _____, the lubricant serves to absorb shock.
Select one:

A. Pump impellers

B. Pump pistons

C. Gas turbine blades

D. Pump lobes

E. Gear teeth intermeshing

Answer 6

E. Gear teeth intermeshing

Question 7

The fire point of oil is the temperature at which enough vapour is given off to:
Select one:

A. Burst into flames

B. Ignite

C. Burn continuously

D. Give off smoke

E. Ignite momentarily

Answer 7

C. Burn continuously

Question 8

The neutralization number indicates the _____ of oil.
Select one:

A. Acidity

B. Volatility

C. Alkalinity

D. Neutralization

E. Carbonization

Answer 8

A. Acidity

Question 9

Frequently, it is possible to improve the desirable characteristics of lubricating oil by the use of all of the following additives except:
Select one:

A. Anti-oxidants

B. Emulsion breakers

C. Viscosity index (VI) improvers

D. Detergent-dispersants

E. Antifoam additives

Answer 9

B. Emulsion breakers

Question 10

Synthetic Oils include:
Select one:

A. Petroleum oil

B. Castor oil

C. Polyglycols and silicones

D. Lard

E. Whale oil

Answer 10

C. Polyglycols and silicones

Question 11

As well as separating the bearing surfaces, the lubricant forms a film on the surfaces, thus protecting them from:
Select one:

A. Pressure

B. Air

C. Moisture

D. Corrosion

E. Temperature

Answer 11

D. Corrosion

Question 12

Often chemical compounds (additives) are added to the lubricant to prevent the formation of _____ due to oxidation of the oil.
Select one:

A. Mercaptans

B. Acids

C. Hydrocarbons

D. Alkalines

E. Alkaloids

Answer 12

B. Acids

Question 13

Mineral oils are produced from _____ and are the most commonly used class
Select one:

A. Castor oil

B. Animal origin

C. Crude petroleum

D. Vegetable origin

E. Lard

Answer 13

C. Crude petroleum

Question 14

The flash point of oil is the temperature at which the oil gives off sufficient vapour to _____ when mixed with air and exposed to a source of ignition.
Select one:

A. Give off smoke

B. Burn continuously

C. Burst into flames

D. Ignite momentarily

E. Ignite

Answer 14

D. Ignite momentarily

Question 15

A common arrangement for temperature control is to _____ the lubricant to the bearing where it picks up heat.
Select one:

A. Use higher viscosity

B. Air cool

C. Circulate generous quantities of

D. Water cool

E. Circulate minimal quantities of

Answer 15

C. Circulate generous quantities of

Question 16

Lubricants in general may provide all of the following services except:
Select one:

A. Minimum coefficient of friction

B. Minimum adhesion to the surfaces to be lubricated

C. Physical stability under variations of temperature and pressure

D. Resistance to oxidation

E. Resistance to emulsion

Answer 16

B. Minimum adhesion to the surfaces to be lubricated

Question 17

The viscosity of oil is greatly affected by the _____ of the oil.
Select one:

A. Specific gravity

B. Temperature

C. Density

D. Mass

E. Pressure

Answer 17

B. Temperature

Question 18

The carbon residue test is used to determine the amount of carbon which oil will form when subjected to:
Select one:

A. Low temperatures

B. High temperatures

C. Low pressures

D. High viscosity

E. High pressures

Answer 18

B. High temperatures

Question 19

As the temperature decreases the oil will become:
Select one:

A. Thinner and less viscous (viscosity will be increased)

B. Thicker and more viscous (viscosity will be decreased)

C. Thinner and more viscous (viscosity will be increased)

D. Thicker and less viscous (viscosity will be increased)

E. Thicker and more viscous (viscosity will be increased)

Answer 19

E. Thicker and more viscous (viscosity will be increased)

Question 20

The characteristics required in good grease include all of the following except:
Select one:

A. Tenacity

B. Consistency

C. Thermal stability

D. Chemical instability

E. Purity

Answer 20

D. Chemical instability