309 Pneumatics Flashcards
IN A PNEUMATIC SYSTEM WHAT PROVIDES THE FORCE THAT PERFORMS WORK?
COMPRESSED AIR
HOW MUCH WORK IS DONE BY A PISTON THAT EXERTS A FORCE OF 15LBS THROUGH A DISTANCE OF 10”
150 IN-LBS
HEATING A GAS IN A SEALED RIGID CONTAINER WILL___THE____ OF THE GAS
INCREASE;PRESSURE
2 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 ITS PRESSURE_________.
INCREASES;DECREASES
A RECIPROCATING COMPRESSOR IS ONE KIND OF _______ COMPRESSOR.
POSITIVE-DISPLACEMENT
IN A TYPICAL RECIPROCATING COMPRESSOR THE INTAKE VLVS ARE FORCED OPEN BY THE
ATMOSPHERIC PRESSURE
THE PURPOSE OF AN INTERCOOLER BETWEEN THE STAGES OF A TWO STAGE COMPRESSOR IS TO REDUCE THE
POWER NEEDED TO RUN THE COMPRESSOR
THE PURPOSES OF LUBRICATING OIL IN A COMPRESSOR ARE TO REDUCE FRICTION BETWEEN THE MOVING PARTS AND TO
IMPROVE THE 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;12000
IMPELLER COMPRESSORS DELIVER AIR AT ______ VOLUME AND ________PRESSURE.
HIGH;LOW
COMPARED TO OTHER KINDS OF COMPRESSORS CENTRIFUGAL COMPRESSORS
REQUIRE MORE POWER
THE MOST EFFECTIVE 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 ITS ______ DECREASES
MOISTURE CAPACITY
THE MOST COMMON WAY TO REMOVE WATER VAPOR FROM THE AIR LEAVING A COMPRESSOR IS TO
COOL THE AIR
WATER COOLED AFTERCOOLERS ARE TYPICALLY USED WITH _______-CAPACITY COMPRESSORS THAT RUN________
LARGE; TEN OR MORE
A DESSICANT REMOVES WATER FROM AIR BY_______IT.
ABSORBING
THE MAIN PURPOSE OF THE RECEIVERIN A PNEUMATIC SYSTEM IS TO
MAINTAIN PRESSURE DURING PEAK DEMAND
THE OPERATION OF AN INERTIAL SEPARATOR DEPENDS ON A
RAPID CHANGE IN THE DIRECTION OF AIR FLOW
OF THE PARTICLES LISTED BELOW THE SMALLEST ARE THE ________ PARTICLES
AEROSOL
A FILTER CAN STOP 100% OF THE PARTICLES DOWN TO A SPECIFIED MINIMUM SIZE. THIS 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
A FINE MIST LUBRICATOR SHOULD BE USED IN A PNEUMATIC SYSTEM IF THE AIR FLOW IS _______ AND/OR THE DISTANCE TO THE EQUIPMENT IS_________
INTERMITTENT; LONG
LAMINAR AIRFLOW IN A PIPING SYSTEM IS MADE TURBULENT BY
CONSTRICTIONS IN THE PIPE
GREATER PRESSURE LOSSES OCCUR IN A PNEUMATICS SYSTEM IF THE AIR IS AT ______ PRESSURE BECAUSE OF GREATER________.
LOW; FRICTION
WHEN USED AS A COMPRESSOR DISCHARGE LINE A PIPE REN SHOULD SLOPE______ IN THE DIRECTION OF THE AIRFLOW BY 1” FOR EVERY ________FT OF PIPE
DOWNWARD; 10
WHEN SHOULD YOU USE PIPE JOINT COMPOUND IN CONNECTING NPT-THREADED PIPE
ALWAYS
IF AN AIR HOSE IS NOT COMPLETELY DEPRESSURIZED WHEN YOU DISCONNECT IT THE GREATEST DANGER TO YOU IS A SUDDEN
BLOWING OF DUST OR CHIPS
A FOUR-WAY VLV HAS FOUR
CONNECTING PORTS
THE _______ VLV IS A GOOD THROTTLING DEVICE AND IS SUITABLE FOR HIGH-PRESSURE SERVICE IT CAUSES ______ PRESSURE LOSS IN THE LINE.
NEEDLE; HIGH
THE SPOOL IN A VLV CONTROLS THE FLOW OF AIR BY _______ FROM ONE POSITION TO ANOTHER. IN A HIGH PRESSURE SYSTEM THE SPOOL IS _______ TO MOVE
SLIDING;EASY
AN ADVANTAGE OF FOUR WAY VLVS OVER TWO AND THREE WAY VLVS IS THAT THEY
SIMPLIFY THE CONTROLS
A VLV HAS FIVE CONNECTING PORTS TWO OF WHICH ARE EXHAUST PORTS. THIS VLV IS A ________ VLV
FOUR-WAY
THE CRACKING PRESSURE OF A SIMPLE POPPET TYPE RELIEF VLV IS DETERMINED BY THE
SPRING ADJUSTMENT
A DIAPHRAGM TYPE RELIEF VLV RESPONDS VERY QUICKLY TO A PRESSURE CHANGE BECAUSE OF ITS
LARGE PRESSURE SENSITIVE AREA
THE ONLY PURPOSE OF A PRESSURE RELIEF VLV IS TO
PROTECT THE SYSTEM FROM DAMAGE
AN INCREASE IN PRESSURE ON THE SECONDARY SIDE OF A PRESSURE REGULATING VLV ______ THE VLV
SLIGHTLY CLOSES
THE BEST WAY TO GUARD AGAINST EXCESSIVE PRESSURE ON THE SECONDARY SIDE OF A PRESSURE REGULATOR IS TO
USE A REGULATOR WITH A BUILT IN RELIEF VLV
THE THRUST THAT CAN BE APPLIED WHEN THE ROD OF A SINGLE ROD DOUBLE ACTING PNEUMATIC CYLINDER IS MOVING OUT OF THE CYLINDER IS _____ THE THRUST THAT CAN BE APPLIED WHEN THE ROD IS MOVING INTO THE CYLINDER
GREATER THAN
AN INTERNAL SPRING IS SOMETIMES USED TO RETURN THE PISTON IN A ______-ACTING _______-ROD PNEUMATIC CYLINDER
SINGLE;SINGLE
THE MAIN PURPOSE OF AN EXHAUST FLOW CONTROL METERING VLV ON A PNEUMATIC CYLINDER IS TO
LIMIT THE RETURN STROKE SPEED
A CYLINDER THAT MUST BE FREE TO PIVOT REQUIRES A _________ MOUNTING
TRUNNION OR CLEVIS
YOU CAN DETERMINE WHETHER A CONTROL VLV CAN DELIVER AIR RAPIDLY ENOUGH FOR A CYLINDER BY CALCULATING THE ________ REQUIRED BY THE VLV
CAPACITY COEFFICIENT
THE HIGHEST TORQUE A PNEUMATIC MOTOR CAN EXERT ON A LOAD IS IT _______ TORQUE
STALLING
THE HORSEPOWER OF A PNEUMATIC MOTOR VARIES WITH THE ________ AND THE ______ OF THE MOTOR SHAFT.
SPEED;TORQUE
THE HIGHEST POWER OUTPUT OF A PNEUMATIC MOTOR OCCURS WHEN ITS SPEED IS
MEDIUM
AN AXIAL PISTON PNEUMATIC MOTOR TRANSMITS FORCE FOR THE PISTON TO THE OUTPUT SHAFT BE MEANS OF A
CAM PLATE AND GEARS
AIR PRESSURE OF 100PSI CAN CREATE HYDRAULIC PRESSURE OF 1000PSI IF AN AIR PISTON DRIVES A ________ HYDRAULIC PISTON
SMALLER DIAMETER
