18 - Eat 3

Question 1

The hydraulic fluid should be compatible with materials used for?
A) Refining B) Sealing C) Altitudes D) Agitation

Answer 1

B) Sealing pg 45

Question 2

Viscosity is the measure of a fluid’s resistance to? A) Pressure B) Flow
C) Friction D) Agitation

Answer 2

B) Flow pg 50

Question 3

Kinematic viscosity is the most common way of measuring?
A) Viscosity B) Resistance C) Flow
D) Load

Answer 3

A) Viscosity pg 52

Question 4

If viscosity is too high, pressures required for operation will increase due to increased fluid? A) Demulsibility B) Friction
C) Turbulence D) Pressure

Answer 4

B) Friction pg 50

Question 5

The measure of a fluid’s rate of change in viscosity with change in temperature is called viscosity _______. A) Meters B) Scales C) Index D) Rule

Answer 5

C) Index pg 54

Question 6

Heat, pressure, water, contaminants, metal surfaces are? A) Seals B) Lubricants C) Contaminants D) Catalysts

Answer 6

D) Catalysts pg 57

Question 7

The property of an oil which allows water to separate from it, is called oxidation? A) Demulsibilty B) Diversion C) Absorbability D) Viscosity

Answer 7

“A) Demulsibility

Demulsibility = ability of a fluid to seperate out or reject water pg 59”

Question 8

A good grade of premium quality hydraulic oil contains various: A) Lubricants B) Additives C) Petroleums D) Synthetics

Answer 8

B) Additives pg 62

Question 9

Fire resistant fluids may be of the water-in-oil emulsion type, water glycol, oil-in-water, and _______. A) Lubricants B) Additives C) Petroleums D) Synthetics

Answer 9

D) Synthetics pg 61?

Question 10

The four primary purposes of hydraulic fluid are: A) Transmission Power B) Cooling C) Lubricant & Seal D) All of the above

Answer 10

D) All of the above pg 45

Question 11

High specific gravity fluids may be more critical in causing pump? A) Cavitation B) Slipperiness C) Refining D) Cleanliness

Answer 11

A) Cavitation pg ?

Question 12

The close mechanical fit and the _____ of the oil, determine leakage rate. A) Cooling B) Lubricating C) Refining D) Viscosity

Answer 12

D) Viscosity pg 65?

Question 13

Pour point is the lowest temperature at which a fluid will? A) Flow B) Freeze C) Demulsify D) Seal

Answer 13

A) Flow pg 57

Question 14

Synthetic fluids are usually more suitable for operation at higher ________ than water based fluids. A) Altitudes B) Temperatures C) Levels D) Cavitation Levels

Answer 14

B) Temperatures pg 63

Question 15

Resistance encountered when moving one layer of liquid over another is? A) Kinetic Viscosity B) High resistance C) Absolute viscosity D) Pour power

Answer 15

C) Absolute viscosity pg 51

Question 16

A chemical reaction between a metal and a chemical is called? A) Oxidation B) Demulsibility C) Corrosion D) Contamination

Answer 16

C) Corrosion pg 59

Question 17

Which one of the following is not a catalysts to oxidation? A) Acid B) Water C) Agitation D) Pressure

Answer 17

A) Acid pg 57

Question 18

Invert emulsions depend on ______ content for their fire-resistant properties. A) Glycol B) Petroleum C) Ethylene D) Water

Answer 18

D) Water

Question 19

Synthetic fluids with phosphate are not compatible with ______ and ______ seals. A) Static; Dynamic B) Nitrile; Neoprene C) Standard; Mechanical D) Simple; Binary

Answer 19

B) Nitrile; Neoprene

Question 20

Phosphate Esters attack elastomers, and are not compatible with some _____ and _______. A) Static; Dynamic B) Paints; Plastics C) Standard; Mechanical D) Simple; Binary

Answer 20

B) Paints; Plastics pg 63