Fluids and Lubrication

Question 1

What is the primary purpose of hydraulic fluid in a system?
a) To transmit power
b) To lubricate moving parts
c) To cool components
d) All of the above

Answer 1

d) All of the above

Question 2

Which property of oil determines its flow rate?
a) Viscosity
b) Density
c) Flash point
d) Specific gravity

Answer 2

a) Viscosity

Question 3

What is the primary function of a lubricant in a gearbox?
a) Prevent overheating
b) Minimize wear and tear
c) Increase torque
d) Secure gears

Answer 3

b) Minimize wear and tear

Question 4

What is a common sign of lubricant contamination?
a) Increased system noise
b) Sludge buildup
c) Reduced efficiency
d) All of the above

Answer 4

d) All of the above

Question 5

Which type of grease is commonly used for high-temperature applications?
a) Calcium-based
b) Lithium-based
c) Sodium-based
d) Polyurea-based

Answer 5

d) Polyurea-based

Question 6

What does an oil analysis test for?
a) Viscosity and contamination
b) Density and pH
c) Flash point and tensile strength
d) Specific gravity and alkalinity

Answer 6

a) Viscosity and contamination

Question 7

What is the purpose of a hydraulic filter?
a) Increase fluid pressure
b) Remove contaminants from the fluid
c) Cool the hydraulic system
d) Add viscosity to the fluid

Answer 7

b) Remove contaminants from the fluid

Question 8

Which type of lubrication system continuously supplies oil to moving parts? a) Manual lubrication
b) Centralized lubrication
c) Splash lubrication
d) Drip lubrication

Answer 8

b) Centralized lubrication

Question 9

What is the purpose of an oil reservoir in a hydraulic system?
a) Store excess fluid
b) Allow heat dissipation
c) Provide fluid to the pump
d) All of the above

Answer 9

d) All of the above

Question 10

What is the function of a pressure relief valve in a hydraulic system?
a) Maintain system pressure
b) Prevent over-pressurization
c) Increase flow rate
d) Reduce friction

Answer 10

b) Prevent over-pressurization

Question 11

What type of lubrication method uses compressed air to deliver oil mist?
a) Manual lubrication
b) Centralized lubrication
c) Mist lubrication
d) Drip lubrication

Answer 11

c) Mist lubrication

Question 12

What property of a lubricant is most critical for high-speed applications?
a) Low viscosity
b) High thermal stability
c) High density
d) Low flash point

Answer 12

a) Low viscosity

Question 13

Which tool is commonly used to measure the viscosity of a fluid?
a) Pyrometer
b) Viscometer
c) Hydrometer
d) Manometer

Answer 13

b) Viscometer

Question 14

What does a pressure gauge in a hydraulic system measure?
a) Fluid flow rate
b) System pressure
c) Fluid temperature
d) Fluid level

Answer 14

b) System pressure

Question 15

Which type of pump is commonly used in lubrication systems?
a) Centrifugal pump
b) Gear pump
c) Piston pump
d) Diaphragm pump

Answer 15

b) Gear pump

Question 16

What is the primary function of a splash lubrication system?
a) Distribute lubricant by splashing it onto moving parts
b) Increase fluid pressure
c) Store lubricant for future use
d) Reduce fluid temperature

Answer 16

a) Distribute lubricant by splashing it onto moving parts

Question 17

Which type of lubrication is commonly used for open gears?
a) Spray lubrication
b) Oil bath lubrication
c) Grease lubrication
d) Drip lubrication

Answer 17

c) Grease lubrication

Question 18

What type of lubricant is best suited for high-temperature environments?
a) Water-based lubricant
b) Silicone-based lubricant
c) Lithium grease
d) Petroleum oil

Answer 18

b) Silicone-based lubricant

Question 19

What is the purpose of an oil viscosity index?
a) Measure oil density
b) Indicate oil performance under temperature changes
c) Determine oil pressure requirements
d) Measure contamination levels

Answer 19

b) Indicate oil performance under temperature changes

Question 20

Which type of lubricant is typically used for chains in dusty environments?
a) Dry film lubricant
b) Grease
c) Silicone oil
d) Mineral oil

Answer 20

a) Dry film lubricant

Question 21

Which type of lubrication system is commonly used for high-speed spindles?
a) Mist lubrication
b) Grease lubrication
c) Splash lubrication
d) Drip lubrication

Answer 21

a) Mist lubrication

Question 22

What is the function of a grease zerk fitting?
a) Provide a sealing mechanism
b) Allow the injection of grease into a bearing or joint
c) Control fluid pressure
d) Align moving parts

Answer 22

b) Allow the injection of grease into a bearing or joint

Question 23

What type of lubricant is recommended for a heavily loaded, slow-moving gear system?
a) High-viscosity oil
b) Light machine oil
c) Silicone grease
d) Dry film lubricant

Answer 23

a) High-viscosity oil

Question 24

Which type of grease is best for high-speed applications?
a) Calcium-based grease
b) Lithium-based grease
c) Molybdenum disulfide grease
d) Graphite-based grease

Answer 24

b) Lithium-based grease

Question 25

What is the primary purpose of an oil level sight glass in a gearbox?
a) Measure oil temperature
b) Allow visual inspection of oil level
c) Prevent oil contamination
d) Reduce oil pressure

Answer 25

b) Allow visual inspection of oil level