Hydraulics 02 Flashcards
After losing the normal hydraulic system, alternate supply is provided by;
a.accumulators only
b.another hydraulic system
c.manual brakes
d.pneumatic pressure
b. another hydraulic system
Hydraulic reservoirs are pressurised by;
a.separate helium gas system
b.ram air in flight only
c.bleed air from gas turbine engine
d.air from the air conditioning system
c. bleed air from gas turbine engine
In order to avoid damage to seals, internal leaks and overheating fluid. Hydraulic systems are only to be replenished with…….?
approved fluid
If hydraulic system pressure is 3000psi, the force provided by a 4 square inch actuator will be?
numbers only (units are a given)
12000
A shuttle valve:
a.allows one source to supply two hydraulic services
b.acts as a non return valve
c.is used to replace NRV’s
d.allows two hydraulic supplies to operate one hydraulic service
d. allows two hydraulic supplies to operate one hydraulic service
With a hydraulic lock
a.there is constant flow
b.no flow but jack continues to move under gravitational effects
c.flow but no jack movement
d.no flow, jack(actuator) is stationary
d. no flow, jack(actuator) is stationary
A pre charge of 1000psi of gas is shown on the accumulator gauge. The system is then pressurised to 3000psi, so the accumulator gauge would read:
( units are a given)
a.4000psi
b.1000psi
c.2000psi
d.3000 psi
d. 3000 psi
A pressure maintaining valve (priority valve)
a. is used to control pressure to services requiring less than system pressure
b.is used to ensure available pressure is directed to essential services
c.is used to increase the pressure in the system
d.is used to maintain hydraulic pump pressure
b. is used to ensure available pressure is directed to essential services
A hydraulic thermal relief:
a.is operated by detecting temperature
b.isolates hydraulic lines when their overheating
c.relieves excessive pressure back to an actuator
d.is operated by detecting pressure
d.is operated by detecting pressure
The following statements relate to hydraulic accumulators. The function of a accumulator is to:
a.Provide the initial pressure when selection is made and the pump is cut-out
b.Replace the need for a reservoir
c.Provide an emergency reserve of pressure in the event of pump failure
d.Prolong the period between pump cut-in and cut-out
e.Dampen pressure fluctuations
f.Allow for fluid expansion
g.Absorb some of the landing loads
h.Store fluid under pressure
i.Allow for thermal expansion
a. Provide the initial pressure when selection is made and the pump is cut-out
c.Provide an emergency reserve of pressure in the event of pump failure
d.Prolong the period between pump cut-in and cut-out
e.Dampen pressure fluctuations
f.Allow for fluid expansion
h.Store fluid under pressure
i.Allow for thermal expansion
