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WorksheetsBasic Pneumatic Systems 2
Total questions: 45
Worksheet time: 23mins
Cam-operated pneumatic valves are designed to function like _____
A. Two-position DCVs
B. Electrical limit switches
C. Roller-operated brakes
D. Mechanical logic gates
Roller-plunger type cam valves are available in 2, 3, and 5-ported designs with _____ positions
A. Four
B. Three
C. Two
D. Zero
Cam-operated valves are commonly used in 2-speed circuits such as the _____ circuits
A. Forward stroke-reverse bleed
B. Backpressure cylinder drive
C. Rapid traverse-slow feed
D. Variable meter-off
_____ are internal shock absorbers that absorb the impact of an actuator's rod to slow it down
A. Power brakes
B. Air cams
C. Cylinder struts
D. Cushions
Two-way valves control flow rate in either direction by functioning as _____ valves
A. On-off
B. Directional control
C. Bi-directional
D. Flow control
_____ are used in general piping and process control systems since they require many turns to fully open to close
A. Plug valves
B. Gate valves
C. Ball valves
D. Butterfly valves
Externally air-piloted DCVs use _____ to actuate
A. Remote air pressure
B. Electrical solenoids
C. Manual overrides
D. Automatic operators
A(n) _____ is a mechanical notch or grip in a DCV spool that holds it in place once power is removed
A. Indention
B. Catch
C. Bar
D. Detent
A _____ spool designs on a pneumatic DCV has no seals between the spools and the bore
A. Packed
B. Lapped
C. Packed bore
D. Grooved
A location where you might find air logic is in _____
A. An automobile factory
B. A paper mill
C. An oil refinery
D. An appliance assembly plant
Air logic is popular in the food processing industry because _____
A. Of the water used to clean the machinery
B. The exhaust air eliminates odors
C. It is less expensive than PLC systems when more than four relays are needed
D. It is cleaner than electricity
Which of the following is NOT true of air logic systems compared to electrical control systems?
A. Air is safer in hazardous environments
B. No electrical power is needed
C. Air logic is less expensive in large systems
D. Air logic cannot be programmed easily
In order to avoid confusion with electrical DCVs, air logic refers to a normally open (N.O.) DCV as being _____
A. Air open
B. Normally not passing
C. Normally passing
D. Pilot on
Shuttle valves are used in air logic circuits to _____
A. Provide OR logic
B. Seal-in spring offset, externally-piloted DCVs
C. Provide an output when either of the two input signals are applied
D. All of the above
E. None of the above
What is a common cause of extra or frequent rust in air tools
A. The tool has a leaking seal
B. The tool is being used incorrectly
C. The filter is not being changed on schedule
D. The tool is undersized
E. All of the above
The _____ of an air filter removes contaminants by trapping them
A. Sintered fiber
B. Baffle
C. Screen
D. Element
_____ are special filters that remove particles contaminants as well as almost all water and oil from the air stream
A. Coalescing filters
B. Water filter
C. Aqueous drains
D. Drip filters
How often should you change a pneumatic filter
A. Once a week
B. Once a year
C. When the water level in the bowel reaches above the 1/2 mark
D. According to the manufacturer's recommendations
Manufacturers give filter performance data in the form of graphs showing _____
A. Pressure drop vs flow rating at various inlet pressures
B. Pressure and flow rating for specific port sizes
C. The maximum pressure achievable for a given filter rating
D. Catalog recommendations based on the application
The easiest and most economical method of pneumatic lubrication is the _____ method
A. Self-lubrication
B. Graphite expansion
C. Pre-lubrication
D. Aerosol
The combination of a lubricator, regulator, and filter on a pneumatic line is called a(n) _____
A. FRL
B. Air prep
C. Single unit lubricator
D. Simplified trio unit
The lubrication in wick venturi lubricators does not travel very far because ______
A. The lubrication does not evaporate
B. The lubricator does not create a fine mist
C. The lubricator has too high of a pressure drop
D. The lubricator is only good for high speed systems
What percentage of the oil seen in the sight glass of a Mirco-Fog lubricator travels downstream
A. 5
B. 10
C. 50
D. 90
What liquid is used in pneumatic lubricators
A. Vegetable based oils
B. Lightweight petroleum-based oil
C. Kerosene
D. SAE #5 mixed with a detergent
Pressure gauges are calibrated using dead weight test machines available from _____
A. The American National Standards Institute (ANSI)
B. The International Organization for Standardization (ISO)
C. The national Physical Measurement Laboratory (PML)
D. The U.S. Bureau of Standards (NBS)
Acrylic flow meters are cleaned using _____
A. Specialized solvents available from the manufacturer
B. A small amount of pure soap and water
C. Alkaline detergents, caustic soda, or chlorinated soaps
D. Stopcock grease or petroleum jelly with a soft brush
The biggest maintenace problem in pneumatic systems is _____
A. Leakage
B. Water contamination
C. DCV solenoid failure
D. Worn actuators
The easiest method for locating air leaks is to _____
A. Apply a soap solution to actuator ports and look for bubbles
B. Tighten suspected loose fittings while the actuators are moving
C. Remove pressure and manually actuate the system to create vacuum in the lines
D. Listen for air leaks when pressure is present and everything is shut down
Piston seals wear is usually a result of _____
A. Old rubber
B. Poor lubrication
C. Cycling too quickly
D. Incorrect installation
The amount of water vapor contained in the air is measured by _____
A. A barometer
B. The temperature
C. The saturation point
D. Relative Humidity
Air leaving the compressor is very hot, which allows water to _____ as it cools
A. Absorb
B. Condense
C. Flow backwards
D. Vaporize
As long as the dew point temperature is below the _____, water remains in its vapor form
A. Atmospheric pressure
B. Ambient air temperature
C. System drainage line
D. Boiling point of water
the most common device used to remove water vapor from air is the _____
A. Aftercooler
B. Coalescing filter
C. Water separator
D. Line dryer
Line dryers lower the dew point of the air stream using _____
A. very cold cooling water
B. A radiator
C. A constant stream of hot air
D. Refrigeration or chemicals
Which of the following is NOT a type of line dryer
A. Regenerative desiccant
B. Chemical
C. Precooling reheater
D. Refrigeration
What is the purpose of a heat exchanger
A. To reduce the air temperature to the dryer's dew point setting
B. To cool down hot refrigerant so it can be reused
C. To warm up cold air once the water is removed
D. To help keep the aftercooler from overheating
Pneumatic system traps are used to _____
A. Keep rust and pipe scale out of the distribution lines
B. Allow access points for component maintenance
C. Remove water and oil from the main air line
D. Keep dryer desiccants from blowing into the system
What type of pneumatic trap is the least desirable since it wastes air when opened
A. Filter traps
B. Desiccant bed traps
C. Manual traps
D. Deliquescent salt traps
In pneumatics, a vacuum is considered any pressure below _____ at the point of measurement
A. Atmospheric pressure
B. System pressure
C. 14.7 psi/101 kPa
D. 0 psi/0 kPa
What is the common unit used to measure vacuum pressures
A. Atm
B. Torr
C. Psig
D. Kbar
E. None of the above
The _____ is constructed similarly to Bourdon tubes and can measure pressures both above and below atmospheric
A. Vacuum gauge
B. Compound gauge
C. Differential gauge
D. Manometer
Vacuum generators create vacuum pressure by passing air through a special flow channel called a(n) _____
A. Venturi
B. Tapped throat
C. Orifice plate
D. Pilot tube
Bernoulli's law states that the product of velocity and pressure is constant for a(n) _____
A. Compressed air stream
B. Ideal gas
C. High pressure volume
D. Laminar flow
To increase the holding force of a vacuum gripper, you can _____
A. Lower the ambient pressure
B. Add cup reinforcements
C. Change to a cup with a bellowed surface
D. Increase the cup size
E. All of the above
Vacuum lift systems contain a vacuum cup, a check valve, a muffler, and a _____
A. Vacuum transducer
B. Vacuum generator
C. Pressure hoist
D. Compressor
