A
which of the following components is used to start and stop the compressor as required?
Pressure switch
____ is the amount of liquid transferred from a pumps inlet to its outlet in one revolution or cycle.
displacement.
a hydraulic___ stores potential power for hydraulic systems future conversion into useful work.
A ___ stores liquid that is not being used in a hydraulic system
accumulator
resivoirrrr
symbols used in hydraulic schematic diagrams must conform to which of the following?
who is required for application, relocation, substitution and removal of portable grounds and temporary bonding equipment?
Ansi
Two qews, or two qews and a trainee
what class of pump is most widely used in a hydraulic system?
positive displacement.
which of the following terms is used to describe the mixing of one gas with another? what about gas and a liquid?
Diffusion, dispersion
___ is the amount of liquid that a pump can deliver at its outlet port per unit of a time at a give drive speed
volumetric output
____ is used to slow an action and prevent shock at the end of a piston stroke.
cushioning device
Compared with positive displacement compressors, centrifugal compressors have___ flow rates and ___ discharge pressures.
disconnected or isolated from specified sources of energy
Higher/ lower
which of the following is not a general type of accumulator?
What is the max pressure an o ring can be used alone?
Vacuum
1500
the oil is not being pumped the pump?
assembly was incorrect
driven in wrong direction
not primed
broken shaft
in a positive displacement pump if all outlets are completely closed____
a & C only
flow control valves are used to limit the amount of flow to a particular component. T or F
Semi rigid tubing should be assembled in a straight line. T or F
Viscosity is the internal resistance of fluid which tends to prevent it from flowing. T or F
True
False
True
in a wet rotary screw compressors, the oil serves what purpose?
the purification system on a pnuematic system is used to remove the contaminants from the air being compressed and to keep the oil clean. T or F
All the above
True
what should be the slope of a 10 ft span?
The three methods for connecting pipe in a pneumatic system are threading welding and flanging. T or F
1"
True
blank.... will increase with pressure, as a pump begins to wear, and this increase creates loss of efficiency.
slippage
A ___ removes ____ foreign particles from hydraulic fluid and is the most effective as a safegaurd against contaminants.
filter / small
The quantity of fluid that passes a given point in a fluid power system in a unit of time is to referred to as the volume of flow.
False
true
What is the primary purpose of a tank or reciever?
store compressed air
The phenomenon of cooloing is used in regularly used in compressed air systems to remove large part of the moisture from the system. T or F
True
in a ____ pump the gallon per minute output can be changed by varying the drive speed
fixed displacement
which of the following conditions are relief valves used to protect hydraulic systems from?
over pressure
typical added hazards could be:
Working on or near voltages above 300v
operating gang operated discs or hookstick discs
installing or removing grounds
work inside cabinet/ metal enclosed
All the above
All above
which one is the aftercooler?
Draw it on board
Draw it
What limits the maximum pressure in a pneumatic system>
relief valve