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SV > Study Guide: Hydraulics > Flashcards

Study Guide: Hydraulics Flashcards

1
Q

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

A

If the left engine fails or the left engine-driven pump pressure is low

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2
Q

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

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3
Q

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

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4
Q

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

A

130 knots

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5
Q

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

A

Ram air turbine (RAT)

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6
Q

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

A

Both center hydraulic electric pump switches are on

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7
Q

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

A

The RAT is not stowed and locked, and is producing hydraulic pressure

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8
Q

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

A

In order to prevent electrical overloads, the pump is inhibited

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9
Q

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

A

On the EICAS status display

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10
Q

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

A

Reservoir quantity is low (below 50%) or reservoir air pressure is low

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11
Q

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

A

The PTU is not operating properly

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12
Q

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

A

Left

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13
Q

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

A

Left, center, and right

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14
Q

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

A

Right

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15
Q

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

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16
Q

767: Across the entire aircraft, how many hydraulic reservoir standpipes are there?

a) One
b) Three
c) Two
d) Four

17
Q

757: Across the entire aircraft, how many hydraulic reservoir standpipes are there?

a) Three
b) Two
c) One
d) Four

18
Q

767: The center system reservoir contains a standpipe to reserve a supply of fluid for the:

a) Reserve brakes and steering system
b) Reserve brakes system
c) Ram air turbine (RAT)
d) Power transfer unit (PTU)

A

Reserve brakes and steering system

19
Q

767: To prevent electrical overload, the No. 2 electric primary pump is inhibited when only one generator (APU or engine) or only external power is available and ___ is/are commanded to operate.

a) The left and right electric hydraulic pumps
b) The air driven pump (ADP)
c) Both center electric hydraulic pumps
d) The other three electric hydraulic pumps

A

The other three electric hydraulic pumps

20
Q

757/767: The ____ is available to supply hydraulic pressure to the center system flight controls in the event of a dual engine failure in flight.

a) Air driven pump
b) Power transfer unit (PTU)
c) Ram air turbine (RAT)
d) DC powered electric hydraulic pump

A

Ram air turbine (RAT)

21
Q

767: When the RESERVE BKS & STRG switch is pressed, the ___ is turned on regardless of switch position.

a) Center system No. 1 electric primary pump
b) Right system electric primary pump
c) Left system electric primary pump
d) Center system No. 2 electric primary pump

A

Center system No. 1 electric primary pump

22
Q

757/767: The ram air turbine (RAT) is armed:

a) On the ground above 80 knots
b) On the ground above 85 knots
c) On the ground above 75 knots
d) Above 130 knots on the ground or airborne

A

On the ground above 80 knots

23
Q

767: In the AUTO position, the air-driven demand pump (ADP) operates automatically whenever the landing gear, flaps, slats, or speed brakes/ground spoilers are selected for operation. The ADP will also operate when:

a) Center system hydraulic pressure drops to a preset value
b) The center No. 2 electric primary pump is inoperative
c) The center No. 1 electric primary pump is inoperative
d) Left system hydraulic pressure drops to a preset value

A

Center system hydraulic pressure drops to a preset value

24
Q

757: When the hydraulic motor generator (HMG) is operating, hydraulic flow to the flaps and slats is ____, resulting in:

a) Reduced, increased operating time for these items
b) Reduced, increased operating time for the flaps, but no impact on the slats
c) Kept the same, no impact on the operation of the flaps and slats
d) Reduced, increased operating time for the slats, but no impact on the flaps

A

Reduced, increased operating time for these items

25
Q

757: Can the hydraulic motor generator (HMG) be driven by the power transfer unit (PTU)?

a) Yes, the HMG may be driven by the PTU, if operating
b) Yes, as long as the right electric hydraulic pump is operating
c) No, the HMG may not be driven by the PTU
d) Yes, as long as the left electric hydraulic pump is operating

A

Yes, the HMG may be driven by the PTU, if operating

26
Q

767: When the air-driven pump (ADP) is inoperative:

a) Landing gear retraction/extension and flap extension/retraction times increase
b) Landing gear retraction and flap extension/retraction times increase
c) Flap extension/retraction times increase
d) There is no noticeable impact on landing gear retraction and flap extension/retraction times

A

Landing gear retraction and flap extension/retraction times increase

SV (16 decks)

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