Hydraulic & Pneumatic Power Systems
Exam Questions And Answers
2 Types of Hydraulic Fluid used in Modern Aircraft? - - -
correct answer ✅1.Mineral Base Fluid
2.Phosphate-Ester Base Fluid
Kind of filter is Micronic Filter? - - -
correct answer ✅Filter - with Special Paper Element
Main Hydraulic Pump take fluid from bottom of reservoir, or
standpipe? - - -
correct answer ✅1.Main Pump - takes fluid from standpipe,
2.Emergency Pump - Takes fluid from bottom of Reservoir.
3.If break in system, it allows main pump to pump all its fluid
overboard. 4.Will still be enough fluid in reservoir to allow
emergency system to extend landing gear & actuate brakes
Why some Hydraulic Reservoirs Pressurized? - - -
correct answer ✅1.Pressurization - ensures fluid will be supplied
to Inlet of Pumps at High Altitude where isn't enough Atmospheric
Pressure to do it
, Hydraulic & Pneumatic Power Systems
Exam Questions And Answers
Double-Action Pump? - - -
correct answer ✅Pump - delivers fluid with movement of pump
handle in both directions
Why most Engine-Driven Hydraulic Pumps have shear section in
drive couplings? - - -
correct answer ✅1.Pump should seize - shear section will break,
2.Disconnecting pump from engine & preventing more damage
Unloading valve do in Hydraulic System? - - -
correct answer ✅1.Unloading Valve/Pressure Regulator- Controls
system pressure by shifting pump outlet fluid from pressurized
system back into reservoir when system pressure is high enough.
2.Fluid Circulates with very little load on pump until system
pressure drops to regulator kick-in value.
3.Pump then forces fluid into system until pressure builds back up
to regulator kick-out value
Purpose of Accumulator in aircraft hydraulic system? - - -
correct answer ✅1.Accumulator - Holds pressure on hydraulic fluid
in system.
Exam Questions And Answers
2 Types of Hydraulic Fluid used in Modern Aircraft? - - -
correct answer ✅1.Mineral Base Fluid
2.Phosphate-Ester Base Fluid
Kind of filter is Micronic Filter? - - -
correct answer ✅Filter - with Special Paper Element
Main Hydraulic Pump take fluid from bottom of reservoir, or
standpipe? - - -
correct answer ✅1.Main Pump - takes fluid from standpipe,
2.Emergency Pump - Takes fluid from bottom of Reservoir.
3.If break in system, it allows main pump to pump all its fluid
overboard. 4.Will still be enough fluid in reservoir to allow
emergency system to extend landing gear & actuate brakes
Why some Hydraulic Reservoirs Pressurized? - - -
correct answer ✅1.Pressurization - ensures fluid will be supplied
to Inlet of Pumps at High Altitude where isn't enough Atmospheric
Pressure to do it
, Hydraulic & Pneumatic Power Systems
Exam Questions And Answers
Double-Action Pump? - - -
correct answer ✅Pump - delivers fluid with movement of pump
handle in both directions
Why most Engine-Driven Hydraulic Pumps have shear section in
drive couplings? - - -
correct answer ✅1.Pump should seize - shear section will break,
2.Disconnecting pump from engine & preventing more damage
Unloading valve do in Hydraulic System? - - -
correct answer ✅1.Unloading Valve/Pressure Regulator- Controls
system pressure by shifting pump outlet fluid from pressurized
system back into reservoir when system pressure is high enough.
2.Fluid Circulates with very little load on pump until system
pressure drops to regulator kick-in value.
3.Pump then forces fluid into system until pressure builds back up
to regulator kick-out value
Purpose of Accumulator in aircraft hydraulic system? - - -
correct answer ✅1.Accumulator - Holds pressure on hydraulic fluid
in system.
