Hydraulic Pumps

Question 1

Hydraulic Power is transmitted by movement of fluid through a ______.

Answer 1

PUMP

Question 2

The pump does not produce pressure, PRESSURE is produced by _______.

Answer 2

Restriction of flow

Question 3

The principle of operation is the same for all pumps

LOW pressure is generated at the _____.

Answer 3

pump inlet

Question 4

The principle of operation is the same for all pumps

HIGH pressure is created at _______ to produce flow

Answer 4

the outlet

Question 5

Single action

Double Action

Rotary Action

Answer 5

Three types of HAND PUMPS

Question 6

Type of hand pump that moves fluid on only 1 stroke of the piston (1 handle movement)

when pump handle is pushed, fluid is drawn in thru inlet check valve from reservoir

when handle is pulled, fluid is forced out thru the outlet check valve to the component

Answer 6

Single action hand pump

Question 7

Type of hand pump that is most commonly used and it moves fluid on BOTH strokes of the piston (handle motion)

Piston draws fluid in from reservoir and provides output pressure to system with BOTH DIRECTIONS of HANDLE MOTION.

Answer 7

Double action hand pump

Question 8

Type of hand pump used primarily for servicing of larger aircraft hydraulic systems

Answer 8

Rotary action hand pump

Question 9

Kind of pump that energy energy for the pump comes
from a power source (engine, ac/dc electrical power)

provides constant hydraulic power supply to all aircraft hydraulic systems

Answer 9

Powered Hydraulic Pumps

Question 10

2 Types of Powered Hydraulic Pumps

Answer 10

Constant Displacement

Variable Displacement

Question 11

Type of Powered Hyd Pump that moves a specific amount of fluid each time the shaft turns (per revolution)

a regulator or relief valve is installed in the system to relieve pressure when the pump delivers more fluid than the system needs

Answer 11

Constant Displacement pump

Question 12

Gear

Gerotor

Piston

Vane

Answer 12

4 types of Constant Displacement pump

Question 13

Type of Constant Displacement pump for MEDIUM pressure systems

it uses spur gears, One gear is the driving gear and other one is Driven gear

Answer 13

Gear pump

Question 14

type of constant displacement pump that has same operating principle as gear pump, (additional tooth)

Answer 14

Gerotor pump

Question 15

type of Constant Displacement pump used for high volume, low pressure hydraulic systems.

Consists of free floating vanes in a ECCENTRICALLY mounted rotor

Answer 15

VANE pump

Question 16

Type of Constant Displacement pump used for High pressure systems

A VALVE PLATE with 2 openings COVERS the end of the cylinders

PISTONS draw fluid in at inlet and forces fluid out at outlet

Answer 16

Fixed Angle Piston Pump

Question 17

type of constant displacement pump that uses a fixed angle “SWASH” plateinstead of a fixed angle housing, re-placing the need for an angled housing

Answer 17

Fixed pitch Swash Plate

Question 18

Type of PUMP that moves only the amount of fluid required by the system

pressure is controlled by VARYING the pump output negating the need for relief valves and regulators

Answer 18

Variable displacement pump

Question 19

Engine (EDP)

Electric Motor

Air Turbine Motor

Hydraulic Motor

Ram Air Turbine (RAT)

Answer 19

These are the sources of Mechanical Power for the HYDRAULIC PUMP

Question 20

Primary source of power in an aircraft hydraulic system

the pump is directly splined to and driven by the engine gear-box

normally always pressurizing the hydraulic system whenever the engine is operating

Answer 20

Engine Driven Pump (EDP)

Question 21

Which hydraulic pump is most commonly

used for low pressure, high volume systems?

Answer 21

vane pump

Question 22

________ is a narrow portion of a drive shaft designed to shear (break) in case of excessive torque loading. Can be caused by pump seizure.

This prevents further damage to either the pump or to the engine gearbox

Answer 22

Shear Point