Intermediate Pneumatics: Maintenance

A common element used in compressed air

filters is ________________.

• sintered bronze

• sand

• plywood

• serrated steel mesh

Synthetic compressed air filters must be ___________ when dirty.

• cleaned in kerosene

• replaced

• recycled

• tapped against a hard surface

A ___________ filter removes water and oil from the air stream by collecting oil and water into droplets and then draining them off.

• multi-level

• spin-dry

• wire screen

• coalescing

The number 70 stamped on an air filter refers

the to _____________ .

• the diameter of the filter in millimeters

• the filter’s micron rating

• the length of the filter in millimeters

• cost of the filter in cents

Using a smaller micron rated filter than needed ____________.

• is not recommended

• will increase service life

• is cost effective

• is usually recommended

The smallest particle the human eye can see

is ___________ microns in diameter.

• 1

• 4

• 10

• 40

When air gains enough water vapor to reach a relative humidity of 100%, the air is said to have reached the __________.

• coalescing point

• peak temperature

• dewpoint

• ambient air point

A dryer in a compressed air system __________.

• lowers the dewpoint of the air

• raises the dewpoint of the air

• maintains a constant dewpoint of the air

• has no effect on the dewpoint of the air

The function of a pneumatic system trap is

to ______________.

• provide an automatic shut off on a compressor

• detect air leaks in a pneumatic system trap is to __________.

• catch large dirt particles from the air

• remove water and oil from the air system

The method of lubricating pneumatic components by mixing the lubricant with the compressed air is called _________ lubrication.

• oil injection

• forced draft

• aerosol

• oil sump