2ND 18

Question 1

The hydraulic fluid is the medium for power transmission, and it also serves as a sealer, coolant, and_______ .

a) contaminant
b) catalyst
c) synthetic
d) lubricant

Answer 1

d) lubricant

Question 2

The hydraulic fluid should be compatible with materials used for______________ .

a) refining
b) sealing
c) altitudes
d) agitation

Answer 2

b) sealing

Question 3

Viscosity is the measure of a fluid’s resistance to_______ .

a) pressure
b) flow
c) friction
d) agitation

Answer 3

b) flow

Question 4

Kinematic viscosity is the most common way of measuring_______.

a) viscosity
b) resistance
c) flow
d) load

Answer 4

a) viscosity

Question 5

If viscosity is too high, pressures required for operation will increase due to increased
fluid ____________.

a) demulsibility
b) friction
c) turbulence
d) pressure

Answer 5

b) friction

Question 6

The measure of a fluid’s rate of change in viscosity with change in temperature is called viscosity_____.

a) meters
b) scale
c) index
d) rule

Answer 6

c) index

Question 7

Heat, pressure, water, contaminants, metal surfaces are_______.

a) seals
b) lubricants
c) contaminants
d) catalysts

Answer 7

d) catalysts

Question 8

The property of an oil which allows water to separate from it, is called oxidation_____.

a) demulsibility
b) diversion
c) absorbability
d) viscosity

Answer 8

a) demulsibility

Question 9

A good grade of premium quality hydraulic oil contains various:

a) lubricants
b) additives
c) petroleum’s
d) synthetics

Answer 9

b) additives

Question 10

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 10

d) synthetics

Question 11

The four primary purposes of hydraulic fluid are:

a) Transmission of power
b) Cooling
c) Lubricate and seal
d) All of the above

Answer 11

d) All of the above

Question 12

High specific gravity fluids may be more critical in causing pump:

a) cavitation
b) slipperiness
c) refining
d) cleanliness

Answer 12

a) cavitation

Question 13

The close mechanical fit and the _______ of the oil, determine leakage rate.

a) cooling
b) lubricating
c) refining
d) viscosity

Answer 13

d) viscosity

Question 14

Pour point is the lowest temperature at which a fluid will____.

a) flow
b) freeze
c) demulsify
d) seal

Answer 14

a) flow

Question 15

Synthetic fluids are usually more suitable for operation at higher________ than water based fluids.

a) altitudes
b) temperatures
c) levels
d) cavitation levels

Answer 15

b) temperatures

Question 16

Resistance encountered when moving one layer of liquid over another is_______ ________.

a) kinematic viscosity
b) high resistance
c) absolute viscosity
d) pour point

Answer 16

c) absolute viscosity

Question 17

A chemical reaction between a metal and a chemical is called________.

a) oxidation
b) demulsibility
c) corrosion
d) contamination

Answer 17

c) corrosion

Question 18

Which one of the following is not a catalysts to oxidation?

a) acid
b) water
c) agitation
d) pressure

Answer 18

a) acid

Question 19

Invert emulsions depend on _______ content for their fire-resistant properties.

a) glycol
b) petroleum
c) ethylene
d) water

Answer 19

d) water

Question 20

Synthetic fluids with phosphate are not compatible with ______ and _______ seals.

a) static, dynamic
b) nitrile, neoprene
c) standard, mechanical
d) simple, binary

Answer 20

b) nitrile, neoprene