Hydraulics Flashcards
1) 757: The power transfer unit (PTU) is automatically activated:
a) If the right engine fails or the right engine-driven pump pressure is low
b) If the left engine fails or the left engine-driven pump pressure is low
c) If the associated hydraulic system pressure drops below a preset value
d) When a dual engine failure occurs in flight
b) If the left engine fails or the left engine-driven pump pressure is low
2) 757: The hydraulic motor generator (HMG) is automatically powered by the
___________ whenever both main AC busses become unpowered in flight.
a) The left engine hydraulic pump or the PTU, if operating
b) The right engine hydraulic pump or the PTU, if operating
c) The center engine hydraulic pump or the PTU, if operating
d) The center engine hydraulic pump or the ADP, if operating
a) The left engine hydraulic pump or the PTU, if operating
3) 767: The hydraulic motor generator (HMG) is automatically powered by the
___________ when electrical power is lost from both main AC busses.
a) The center hydraulic system
b) The right hydraulic system
c) The left engine hydraulic pump or the PTU, if operating
d) The left hydraulic system
a) The center hydraulic system
4) 757/767: When deployed, the RAT drives a hydraulic pump that supplies adequate
pressure for flight controls down to an airspeed of approximately ______..
a) 80 knots
b) 100 knots
c) 120 knots
d) 130 knots
d) 130 knots
5) 757: The center hydraulic system reservoir contains a standpipe to reserve hydraulic
fluid for the ________ in the event of a center system hydraulic leak.
a) Reserve brakes
b) Power transfer unit (PTU)
c) Ram air turbine (RAT)
d) Reserve brakes and steering system
c) Ram air turbine (RAT)
6) 757: To prevent electrical overloads, the No. 2 electric pump is inhibited when only one
generator (APU or engine) or only external power is available and:
a) Left and right electric pump switches are on
b) Both engine-driven pump switches are on
c) Both center hydraulic electric pump switches are on
d) The right electric pump switch is on
c) Both center hydraulic electric pump switches are on
7) 757/767: According to the graphic, what is the status of the ram air turbine (RAT)?
a) The RAT is not stowed and locked, and is not producing adequate hydraulic
pressure
b) The RAT is not stowed and locked, and is using standpipe fluid
c) The RAT is armed
d) The RAT is not stowed and locked, and is producing hydraulic pressure
d) The RAT is not stowed and locked, and is producing hydraulic pressure
8) 757: External power is the sole source of electrical power. The center No. 2 electric
hydraulic primary pump PRESS light is illuminated because:
a) The pump is inhibited when the associated N3 is below 50%
b) The pump only operates when associated system pressure is low
c) The pump has failed
d) In order to prevent electrical overloads, the pump is inhibited
d) In order to prevent electrical overloads, the pump is inhibited
9) 757/767: The hydraulic quantity for each hydraulic system is displayed:
a) On the EICAS control panel
b) On the hydraulic control panel
c) On the standby engine indicator (SEI)
d) On the EICAS status display
d) On the EICAS status display
10) 757: According to the graphic, the RSVR light is illuminated. This indicates that:
a) Reservoir quantity is low (below 50%) or reservoir air pressure is high
b) Reservoir quantity is low (below 75%) or reservoir air pressure is high
c) Reservoir quantity is low (below 75%) or reservoir air pressure is low
d) Reservoir quantity is low (below 50%) or reservoir air pressure is low
d) Reservoir quantity is low (below 50%) or reservoir air pressure is low
11) 757: According to the graphic, the EICAS POWER XFER UNIT status message is
displayed. What is the status of the power transfer unit (PTU)?
a) The PTU has been activated and is operating properly
b) The PTU has been activated
c) The PTU switch on the auxiliary panel has been placed to the ON position while
airborne
d) The PTU is not operating properly
d) The PTU is not operating properly
12) 757: Trailing edge flaps and leading edge slats are hydraulically operated by drive units
normally powered by the _____ hydraulic system(s).
a) Right
b) Left
c) Center
d) Left, center and right
b) Left
13) 757/767: Yaw control is provided by a single rudder which receives hydraulic power from the \_\_\_\_\_\_\_\_\_ hydraulic system(s). a) Right and center only b) Left, center, and right c) Left and right only d) Left only
b) Left, center, and right
14) 757: According to the graphic, when the RESERVE BRAKES switch is activated, fluid
trapped below a standpipe is made available to the _________ system electric hydraulic
pump.
a) Left
b) Right
c) Center No. 1
d) Center No. 2
b) Right
15) 757: When activated, the power transfer unit (PTU) supplements the left hydraulic
system electric motor-driven pump to operate the following:
a) Flaps and slats, landing gear, nose wheel steering, HMG
b) Flaps and slats, landing gear, nose wheel steering
c) Flaps and slats, landing gear, nose wheel steering, reserve brakes
d) Landing gear, nose wheel steering, HMG
a) Flaps and slats, landing gear, nose wheel steering, HMG