Hydraulics and Pneumatics Flashcards
What is the primary cause of cavitation in a hydraulic pump?
a) High fluid viscosity
b) Air bubbles in the fluid
c) Low operating temperature
d) Excessive fluid pressure
b) Air bubbles in the fluid
Which type of pump is most commonly used in hydraulic systems?
a) Centrifugal pump
b) Gear pump
c) Diaphragm pump
d) Submersible pump
b) Gear pump
What is the purpose of a hydraulic accumulator?
a) Store energy for sudden demand
b) Remove contaminants from the fluid
c) Control fluid temperature
d) Reduce system pressure
a) Store energy for sudden demand
What is the primary function of a hydraulic cylinder?
a) Convert hydraulic energy into mechanical force
b) Increase fluid pressure
c) Lubricate moving parts
d) Store hydraulic fluid
a) Convert hydraulic energy into mechanical force
What is the purpose of a breather in a hydraulic reservoir?
a) Prevent fluid leaks
b) Allow air exchange while keeping contaminants out
c) Increase system pressure
d) Cool the hydraulic fluid
b) Allow air exchange while keeping contaminants out
What type of fluid is typically used in a hydraulic system?
a) Water
b) Synthetic oil
c) Mineral-based hydraulic fluid
d) Diesel fuel
c) Mineral-based hydraulic fluid
What is the main purpose of a pressure relief valve in a hydraulic system?
a) Increase fluid pressure
b) Protect the system from over-pressurization
c) Maintain constant fluid flow
d) Reduce fluid temperature
b) Protect the system from over-pressurization
What is the purpose of a heat exchanger in a hydraulic system?
a) Maintain consistent fluid temperature
b) Increase system pressure
c) Remove contaminants from the fluid
d) Reduce fluid viscosity
a) Maintain consistent fluid temperature
What is the purpose of a check valve in a hydraulic system?
a) Prevent fluid backflow
b) Maintain fluid temperature
c) Reduce system pressure
d) Increase flow rate
a) Prevent fluid backflow
What is the most common cause of overheating in a hydraulic system?
a) Contaminated fluid
b) Low fluid levels
c) Excessive pressure
d) Insufficient cooling
d) Insufficient cooling
What is the purpose of a hydraulic fluid’s anti-wear additive?
a) Reduce oxidation in the system
b) Minimize wear on metal surfaces
c) Lower fluid viscosity
d) Prevent fluid foaming
b) Minimize wear on metal surfaces
What is the function of a filter in a hydraulic system?
a) Maintain fluid pressure
b) Remove contaminants from the fluid
c) Regulate fluid flow
d) Increase fluid temperature
b) Remove contaminants from the fluid
What is the purpose of a hydraulic flow control valve?
a) Prevent fluid leakage
b) Regulate the speed of actuators
c) Maintain fluid pressure
d) Cool the hydraulic fluid
b) Regulate the speed of actuators
What is the most likely cause of hydraulic hose failure?
a) High fluid viscosity
b) Excessive temperature
c) Improper installation or routing
d) Incorrect fluid selection
c) Improper installation or routing
What is the primary cause of fluid aeration in a hydraulic system? a) High fluid temperature
b) Fluid contamination
c) Air entering the system through leaks
d) Excessive fluid pressure
c) Air entering the system through leaks
What type of pump is typically used in hydraulic systems requiring high pressure?
a) Centrifugal pump
b) Gear pump
c) Piston pump
d) Diaphragm pump
c) Piston pump
Which property of a hydraulic fluid is crucial for cold-weather operation?
a) High viscosity index
b) Low flash point
c) High thermal conductivity
d) Low pour point
d) Low pour point
What is the purpose of a hydraulic check valve?
a) Maintain constant pressure
b) Prevent fluid backflow
c) Regulate flow rate
d) Filter hydraulic fluid
b) Prevent fluid backflow
What is the primary function of a hydraulic pressure relief valve?
a) Regulate flow rate
b) Prevent over-pressurization in the system
c) Maintain fluid temperature
d) Reduce contamination
b) Prevent over-pressurization in the system
What is the purpose of a hydraulic accumulator?
a) Store pressurized fluid
b) Filter contaminants
c) Regulate flow rate
d) Maintain system temperature
a) Store pressurized fluid
Which component converts fluid pressure into mechanical motion in a hydraulic system?
a) Pump
b) Actuator
c) Filter
d) Valve
b) Actuator
What is a primary advantage of pneumatic systems over hydraulic systems?
a) Higher efficiency
b) Cleaner operation
c) Greater power output
d) Lower operating speed
b) Cleaner operation
What is the most common cause of cavitation in a hydraulic pump?
a) High fluid viscosity
b) Air bubbles in the fluid
c) Low operating temperature
d) Overpressure in the system
b) Air bubbles in the fluid
What is the function of a flow restrictor in a pneumatic system?
a) Increase system pressure
b) Control the speed of actuators
c) Prevent backflow
d) Filter contaminants
b) Control the speed of actuators
