Module 4 Flashcards
the device used in a hydraulic system to convert mechanical energy into hydraulic energy
Pump
the ratio of a pump’s actual delivery rate to its theoretical displacement
Volumetric efficiency
the ratio of a pump’s hydraulic power output to its mechanical power input
Overall efficiency
A hydraulic pump converts _____ energy into _____ energy.
Mechanical; Hydraulic
Pumps classified by their principle of operation include _____ and _____ types.
Positive-displacement; Nonpositive-displacement
Positive-displacement pumps have either a(n) _____ or _____ displacement.
Fixed; Variable
Fixed-displacement pumps are _____ efficient than variable-displacement pumps.
More
The delivery rate or flow rate of a pump is commonly referred to as its _____.
Capacity
To prevent overheating and internal slippage, a high-pressure pump is limited to a minimum operating _____.
Speed
Name the two ways in which pump efficiency is described.
Volumetric; Overall
The service life of a pump is specified in terms of operating _____.
Hours
External gear pumps can operate at pressures of up to _____ psi.
3000
Internal gear pumps are used in hydraulic systems that have _____ speeds and _____ capacities.
Low; Small
Gerotor pumps are made without an internal gear _____.
Separator
A vane pump in which the rotor is placed off-center is said to be _____.
Unbalanced