1 Teepeesee Flashcards
In a pneumatic system what provides force that performs work?
Compressed air
How much work is done by a piston that exerts a force if 15lbs through a distance of 10in?
150 in-lbs
Work = force x piston travel
Work = 15 x 10 = 150
Heating a gas in a scaled rigid container will _______ the _______ of the gas
Increase; pressure
Two cylinders having different diameters are connected by an air line. A force applied to the smaller piston makes it move. In response the larger piston exerts a force on a load and makes it move. The force on the load is _________ ____ the force applied to the smaller piston, and the distance the load moves is _______ ____ the distance the smaller piston moves.
Greater than; Less than
When air flowing in a pipe reaches a section where the diameter is reduced, the speed of the air ________ and it’s pressure ________.
Increases; decreases
A reciprocating compressor is one kind of ________________ compressor.
Positive-displacement
In a typical reciprocating compressor, the intake valves are forced open by the:
Atmospheric pressure
The purpose of an intercooler between the stages of a 2-stage compressor is to reduce the:
The power needed to run the compressor
The purposes of lubricating oil in a compressor are to reduce friction between moving parts and to:
Improve cooling of the compressor
The advantage of unloading a compressor is to allow it to:
Run without delivering air
Single-stage sliding-vane compressors can produce pressures up to _____ psi.
50
Rotary-screw compressors run at speeds ranging from ______ to _______ rpm.
3000 to 12000
Impeller compressors deliver air at ______ volume and ______ pressure.
High; low
Compared to other kinds of compressors, centrifugal compressors:
Require more power
The most efficient method of reducing the output of centrifugal compressors is _______ ________ but may not work well if the reduction is too _______.
Speed variation; large
Water often collects in a pneumatic system, because when air is compressed, it’s _________ _________ decreases.
Moisture capacity
The most common way to remove vapor from the air leaving a compressor is to:
Cool the air
Water-cooled after coolers are typically used with _____-capacity compressors that run _______ hours a day
Large; more than 10
A dessicant removes water from air by ________ it.
Absorbing
The main purpose of the receiver in a pneumatic system is to:
Maintain pressure during peak demand
The operation of an inertial separator depends on a(n):
Rapid change in the direction of air flow
Of the particles listed below, the smallest are the ________ particles
Aerosols
A filter can stop 100% of particles down to a specific size. The size is called the filter’s ________ rating
Absolute
An advantage of wetted filters over dry filters is that wetted filters:
Can be cleaned many times
