Pneumatics quiz 1 Flashcards
A ______ is essential for running hydraulic power systems smoothly.
Hydraulic pump
It is connected to either a _______ and _______ induction motor.
single-phase, three-phase
The pump shaft and motor shaft are coupled using a ____ , ______ and _______.
gasket, nuts, and bolts.
The pump generates ___________, not ________
Flow, pressure
_________ results from resistance to fluid flow.
Pressure
________ creates a vacuum, increasing volume and pulling water from sources like lakes, ponds, or rivers.
Positive Half Cycle
Discharges water by reducing volume.
Negative Half Cycle
The heart of hydraulic a hydraulic system
Pump
The ______ does not generate pressure.
Pump
A pump is a hydraulic machine that is used to import_____________ to water and or liquid in the form of pressure energy or kinetic energy
Hydraulic energy
The speed of a pump shaft depends on the ____________.
motor shaft speed
Motor shaft speed is expressed as,
N_s = 120f/P
The amount (volume) of fluid that delivers per unit time through the discharge pipe
Flow Rate
Pump flow rate is expressed as,
Qt = Vp x N
An ________ converts electrical power to mechanical power to drive or rotate the pump.
Induction motor
The ________ is produced when the pump-motor is rotating in a specified direction
Torque
The torque that is generated at the ________ of the motor pump
shaft
Torque is expressed as,
T = F x r
The rate of receiving and delivering energy is known as power (p) and mathematically, it is expressed as,
p = 2πT x N
__________ is used to pump when a certain volume of fluid is displaced and transferred from one place to another place.
Hydraulic pump
According to Displacement,
- Positive displacement (hydrostatic) pump (PDP)
- Non-positive (hydrodynamic or kinetic or dynamic pressure) pump (NPDP)
Types of positive displacement pump
- Reciprocating
- Rotating
Types of Reciprocating Pump According to action of water on piston
- single-acting pump
- Double -acting pump
Types of Reciprocating Pump Based on the number of cylinder uses
- Single-cylinder pump
- Double-cylinder pump
- Triple-cylinder pump
__________ develops flow by carrying fluid between the teeth of two meshed gears
gear pump
__________ are considerably larger than gear teeth pumps, but there are only two or three ________ are used on each rotor.
lobe pumps, lobe
consists of a circular rotor rotating inside of a larger circular cavity
Vane pump
axial flow positive displacement unit.
Screw pump
The two shafts namely the ________ shaft and _______ shaft are attached to form meshing within a close-fitting housing
Driving, driven
a ______ the cylinder block and driveshaft are located on the same centerline
Piston pump
The piston usually moves __________ direction to create the ________ at the inlet pipe.
Backward, vacuum
This type of pump is normally designed with a variable displacement capability. The maximum swash plate angle is limited to ______ by construction
17.5°
This _________ is defined as the ratio of the actual flow rate (𝑄𝐴) to the theoretical flow rate (𝑄𝑇 ) of a pump
volumetric efficiency
Volumetric efficiency of Gear Pump
80-90 percent
Volumetric efficiency of Vane Pump
92 percent
Volumetric efficiency of Piston Pump
90-98 percent
___________ is defined as the ratio of actual pump power output to the input power of the shaft.
Mechanical efficiency
The ___________ is also defined as the product of volumetric efficiency and mechanical efficiency
Overall efficiency
