WorksheetsAircraft Hydraulic System Quiz
Total questions: 20
Worksheet time: 10mins
What is the primary purpose of a hydraulic system in an aircraft?
Cooling the engine
Fuel management
Actuating mechanical components
Controlling cabin pressure
Which of the following components converts hydraulic pressure into mechanical movement?
Accumulator
Reservoir
Actuator
Pump
What is typically used as the fluid in aircraft hydraulic systems?
Water
Skydrol or MIL-H-5606
Kerosene
Engine oil
What is the function of a hydraulic pump in the system?
Store hydraulic fluid
Create pressure in the system
Filter contaminants
Measure temperature
What is the purpose of an accumulator in a hydraulic system?
To reduce fluid temperature
To store hydraulic energy
To vent excess pressure
To isolate the fluid lines
Which type of hydraulic pump is most commonly used in large aircraft?
Hand pump
Ram pump
Vane pump
Variable displacement pump
What color is commonly used for Skydrol hydraulic fluid?
Red
Green
Purple
Blue
A leak in the hydraulic line will most likely result in:
Increased pressure
Constant fluid temperature
Loss of pressure and functionality
Faster operation of components
What safety precaution must be taken when working with hydraulic accumulators?
Fully charge the accumulator before maintenance
Bleed off pressure before servicing
Cool down the accumulator with water
Shake the accumulator to ensure fluid mixing
In a closed-center hydraulic system, what happens when no actuators are operating?
Fluid returns to the reservoir
Pump continues pumping at full capacity
System maintains pressure without fluid flow
All valves open
Which component filters debris and contaminants from hydraulic fluid?
Reservoir
Filter
Actuator
Valve
What is the typical operating pressure range in modern commercial aircraft hydraulic systems?
500-1000 psi
1000-2000 psi
2500-3000 psi
4000-5000 psi
What could cause cavitation in a hydraulic pump?
Excessive pressure
Contaminated fluid
Low fluid level or air in the system
Cold operating temperatures
Why are multiple independent hydraulic systems used in aircraft?
To reduce weight
To increase speed
For redundancy and safety
To simplify design
What is the purpose of a priority valve in a hydraulic system?
Boost fluid pressure
Allow fluid to bypass the filter
Ensure critical systems receive pressure first
Mix hydraulic fluids
What is the role of Power Transfer Unit (PTU)
To regulate the pressure
To ensure operation in high altitude
To distribute pressure during one engine failure
To support one engine during failure in generating thrust
What is the role of Selector valve?
To select the pressure value
To distribute pressure evenly in all connected pipelines
To switch the flow between two different pipelines
To avoid the bleed in pipelines
The need for non-return valve is to
avoid leakage
avoid reverse flow
avoid wastage of fluids
avoid pressure drop
True or False statement. The Blue line in hydraulic system is operated by Engine 2
True
False
True or False statement. The Green line in the hydraulic system is operated by Engine 1
True
False
