Hydraulics & Pneumatics Final Exam Graded A+
Absolute pressure can be used in systems that have vacuums to avoid using a
negative number. (T/F) - ANS-True
Changing the angle of the swash plate in a variable-displacement piston pump does
not affect the distance of how far back a piston pulls. (T/F) - ANS-False
Bleed-off systems are used when more flow control accuracy and less system
efficiency is required. (T/F) - ANS-False
Piston speed is not affected by the amount that an orifice in a flow control valve is
open to allow fluid flow. (T/F) - ANS-False
Needle valves can have built-in check valves for applications that require fluid flow
in the opposite direction of the needle valve's metered flow. (T/F) - ANS-True
A turnbuckle's fittings are commonly two eyebolts, though they may also be any
combination of eyebolts, hooks, or pinned jaws. (T/F) - ANS-True
A static seal is used between moving parts to prevent leaks or contamination. (T/F)
- ANS-False
Cup seals include v-ring and u-ring seals. (T/F) - ANS-True
With counterbalance valves, the pressure created in the cylinder by the weight of
the load cannot travel through the valve and back the reservoir until it overcomes
the biasing spring force. (T/F) - ANS-True
Hydraulic fluid in a drain lines returns to the reservoir under little to no pressure.
(T/F) - ANS-True
Nominal-rated filters with surface-type elements are 50-75% efficient. (T/F) - ANS-
True
Most bypass filters are color-coded to indicate three different filter conditions. (T/F)
- ANS-True
A pressure switch is either located between the air compressor and the receiver or
is attached directly to the receiver. (T/F) - ANS-True
Centrifugal air compressors are high-pressure, low-flow air compressors. (T/F) -
ANS-False
Rotary-screw air compressors with two intermeshing screw shafts are the most
Absolute pressure can be used in systems that have vacuums to avoid using a
negative number. (T/F) - ANS-True
Changing the angle of the swash plate in a variable-displacement piston pump does
not affect the distance of how far back a piston pulls. (T/F) - ANS-False
Bleed-off systems are used when more flow control accuracy and less system
efficiency is required. (T/F) - ANS-False
Piston speed is not affected by the amount that an orifice in a flow control valve is
open to allow fluid flow. (T/F) - ANS-False
Needle valves can have built-in check valves for applications that require fluid flow
in the opposite direction of the needle valve's metered flow. (T/F) - ANS-True
A turnbuckle's fittings are commonly two eyebolts, though they may also be any
combination of eyebolts, hooks, or pinned jaws. (T/F) - ANS-True
A static seal is used between moving parts to prevent leaks or contamination. (T/F)
- ANS-False
Cup seals include v-ring and u-ring seals. (T/F) - ANS-True
With counterbalance valves, the pressure created in the cylinder by the weight of
the load cannot travel through the valve and back the reservoir until it overcomes
the biasing spring force. (T/F) - ANS-True
Hydraulic fluid in a drain lines returns to the reservoir under little to no pressure.
(T/F) - ANS-True
Nominal-rated filters with surface-type elements are 50-75% efficient. (T/F) - ANS-
True
Most bypass filters are color-coded to indicate three different filter conditions. (T/F)
- ANS-True
A pressure switch is either located between the air compressor and the receiver or
is attached directly to the receiver. (T/F) - ANS-True
Centrifugal air compressors are high-pressure, low-flow air compressors. (T/F) -
ANS-False
Rotary-screw air compressors with two intermeshing screw shafts are the most
