CHAPTER 30

Question 1

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

A.
Air cool

B.
Use higher viscosity

C.
Circulate minimal quantities of

D.
Circulate generous quantities of

E.
Water cool

Answer 1

D.
Circulate generous quantities of

Question 2

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

A.
Lobes and cylinder walls

B.
Impellers and casing walls

C.
Stationary and moving blades

D.
Pistons and cylinder walls

E.
Screws and cylinder walls

Answer 2

D.
Pistons and cylinder walls

Question 3

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

A.
Soapstone

B.
Molybdenum disulphide

C.
Graphite

D.
Petroleum oil

E.
Mica

Answer 3

D.
Petroleum oil

Question 4

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

A.
Air

B.
Corrosion

C.
Temperature

D.
Pressure

E.
Moisture

Answer 4

B.
Corrosion

Question 5

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

A.
Gas

B.
Oil

C.
Semi-solid

D.
Grease

E.
Semi-liquid

Answer 5

C.
Semi-solid

Question 6

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

A.
Hydrocarbons

B.
Mercaptans

C.
Alkalines

D.
Acids

E.
Alkaloids

Answer 6

D.
Acids

Question 7

Fixed oils also called fatty oils produced from all of the following except:
Select one:

A.
Cottonseed oil

B.
Whale oil

C.
Lard

D.
Petroleum oil

E.
Castor oil

Answer 7

D.
Petroleum oil

Question 8

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

A.
Pump impellers

B.
Gear teeth intermeshing

C.
Pump pistons

D.
Pump lobes

E.
Gas turbine blades

Answer 8

B.
Gear teeth intermeshing

Question 9

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

A.
Physical stability under variations of temperature and pressure

B.
Minimum adhesion to the surfaces to be lubricated

C.
Resistance to emulsion

D.
Resistance to oxidation

E.
Minimum coefficient of friction

Answer 9

B.
Minimum adhesion to the surfaces to be lubricated

Question 10

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

A.
Changes greatly with pressure change

B.
Changes little with pressure change

C.
Does not changes with temperature change

D.
Changes little with temperature change

E.
Changes greatly with temperature change

Answer 10

D.
Changes little with temperature change

Question 11

Solid lubricants are suitable for use under conditions of:
Select one:

A.
Dust

B.
High load

C.
Corrosive atmospheres

D.
Dampness

E.
Low load

Answer 11

B.
High load

Question 12

Synthetic Oils include:
Select one:

A.
Castor oil

B.
Whale oil

C.
Polyglycols and silicones

D.
Lard

E.
Petroleum oil

Answer 12

C.
Polyglycols and silicones

Question 13

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

A.
Carbonization

B.
Neutralization

C.
Acidity

D.
Volatility

E.
Alkalinity

Answer 13

C.
Acidity

Question 14

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

A.
Lowest temperature

B.
Highest pressure

C.
Lowest pressure

D.
Lowest viscosity

E.
Highest temperature

Answer 14

A.
Lowest temperature

Question 15

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.
Emulsion breakers

B.
Corrosion inhibitors

C.
Anti-oxidants

D.
Detergent-dispersants

E.
Pour point depressants

Answer 15

A.
Emulsion breakers

Question 16

As the temperature increases the oil will:
Select one:

A.
Thicken and become more viscous (viscosity will be reduced)

B.
Thin out and become less viscous (viscosity will be reduced)

C.
Thin out and become less viscous (viscosity will be increased)

D.
Thin out and become more viscous (viscosity will be reduced)

E.
Thicken and become less viscous (viscosity will be reduced)

Answer 16

B.
Thin out and become less viscous (viscosity will be reduced)

Question 17

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.
Burst into flames

B.
Ignite

C.
Burn continuously

D.
Give off smoke

E.
Ignite momentarily

Answer 17

E.
Ignite momentarily

Question 18

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

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

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

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

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

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

Answer 18

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

Question 19

The reasons for using lubricants include all of the following except:
Select one:

A.
To provide sealing

B.
To reduce corrosion

C.
To reduce wear

D.
For temperature control

E.
To increase friction

Answer 19

E.
To increase friction

Question 20

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

A.
Gas

B.
Grease

C.
Semi-liquid

D.
Solid

E.
Oil

Answer 20

D.
Solid

Question 21

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

A.
Specific gravity

B.
Pressure

C.
Density

D.
Mass

E.
Temperature

Answer 21

E.
Temperature

Question 22

While providing lubrication, semi-solid lubricants (grease) are not able to:
Select one:

A.
Seal out dirt from bearings

B.
Prevent rusting during idle periods

C.
Remove large amounts of heat from the bearing

D.
Give bearing surfaces a protective coating

E.
Seal out water from bearings

Answer 22

C.
Remove large amounts of heat from the bearing

Question 23

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

A.
Grease

B.
Semi-liquid

C.
Liquid

D.
Oil

E.
Gas

Answer 23

C.
Liquid

Question 24

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

A.
Crude petroleum

B.
Lard

C.
Vegetable origin

D.
Animal origin

E.
Castor oil

Answer 24

A.
Crude petroleum

Question 25

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

A.
Changes little with pressure change

B.
Changes little with temperature change

C.
Does not changes with temperature change

D.
Changes greatly with temperature change

E.
Changes greatly with pressure change

Answer 25

D.
Changes greatly with temperature change

Question 26

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

A.
Ignite momentarily

B.
Give off smoke

C.
Burn continuously

D.
Ignite

E.
Burst into flames

Answer 26

C.
Burn continuously

Question 27

Solid lubricants are suitable for use under conditions of:
Select one:

A.
Dust

B.
Extreme (high or low) temperatures

C.
Low load

D.
Corrosive atmospheres

E.
Dampness

Answer 27

B.
Extreme (high or low) temperatures

Question 28

The viscosity index is a measurement of how much the viscosity of a certain oil changes with _____ change.
Select one:

A.
Specific gravity

B.
Pressure

C.
Temperature

D.
Mass

E.
Density

Answer 28

C.
Temperature

Question 29

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

A.
Low pressures

B.
Low temperatures

C.
High viscosity

D.
High pressures

E.
High temperatures

Answer 29

E.
High temperatures