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3rd 6 MONTHS > 309 Pneumatics > Flashcards

309 Pneumatics Flashcards

1
Q

IN A PNEUMATIC SYSTEM WHAT PROVIDES THE FORCE THAT PERFORMS WORK?

A

COMPRESSED AIR

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2
Q

HOW MUCH WORK IS DONE BY A PISTON THAT EXERTS A FORCE OF 15LBS THROUGH A DISTANCE OF 10”

A

150 IN-LBS

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3
Q

HEATING A GAS IN A SEALED RIGID CONTAINER WILL___THE____ OF THE GAS

A

INCREASE;PRESSURE

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4
Q

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.

A

GREATER THAN;LESS THAN

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5
Q

WHEN AIR FLOWING IN A PIPE REACHES A SECTION WHERE THE DIAMETER IS REDUCED THE SPEED OF THE AIR _______AND ITS PRESSURE_________.

A

INCREASES;DECREASES

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6
Q

A RECIPROCATING COMPRESSOR IS ONE KIND OF _______ COMPRESSOR.

A

POSITIVE-DISPLACEMENT

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7
Q

IN A TYPICAL RECIPROCATING COMPRESSOR THE INTAKE VLVS ARE FORCED OPEN BY THE

A

ATMOSPHERIC PRESSURE

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8
Q

THE PURPOSE OF AN INTERCOOLER BETWEEN THE STAGES OF A TWO STAGE COMPRESSOR IS TO REDUCE THE

A

POWER NEEDED TO RUN THE COMPRESSOR

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9
Q

THE PURPOSES OF LUBRICATING OIL IN A COMPRESSOR ARE TO REDUCE FRICTION BETWEEN THE MOVING PARTS AND TO

A

IMPROVE THE COOLING OF THE COMPRESSOR

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10
Q

THE ADVANTAGE OF UNLOADING A COMPRESSOR IS TO ALLOW IT TO

A

RUN WITHOUT DELIVERING AIR

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11
Q

SINGLE STAGE SLIDING VANE COMPRESSORS CAN PRODUCE PRESSURES UP TO _______PSI

A

50

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12
Q

ROTARY SCREW COMPRESSORS RUN AT SPEEDS RANGING FROM ______TO ________ RPM

A

3000;12000

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13
Q

IMPELLER COMPRESSORS DELIVER AIR AT ______ VOLUME AND ________PRESSURE.

A

HIGH;LOW

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14
Q

COMPARED TO OTHER KINDS OF COMPRESSORS CENTRIFUGAL COMPRESSORS

A

REQUIRE MORE POWER

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15
Q

THE MOST EFFECTIVE METHOD OF REDUCING THE OUTPUT OF CENTRIFUGAL COMPRESSORS IS ______ , BUT MAY NOT WORK WELL IF THE REDUCTION IS TOO______

A

SPEED VARIATION; LARGE

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16
Q

WATER OFTEN COLLECTS IN A PNEUMATIC SYSTEM BECAUSE WHEN AIR IS COMPRESSED ITS ______ DECREASES

A

MOISTURE CAPACITY

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17
Q

THE MOST COMMON WAY TO REMOVE WATER VAPOR FROM THE AIR LEAVING A COMPRESSOR IS TO

A

COOL THE AIR

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18
Q

WATER COOLED AFTERCOOLERS ARE TYPICALLY USED WITH _______-CAPACITY COMPRESSORS THAT RUN________

A

LARGE; TEN OR MORE

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19
Q

A DESSICANT REMOVES WATER FROM AIR BY_______IT.

A

ABSORBING

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20
Q

THE MAIN PURPOSE OF THE RECEIVERIN A PNEUMATIC SYSTEM IS TO

A

MAINTAIN PRESSURE DURING PEAK DEMAND

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21
Q

THE OPERATION OF AN INERTIAL SEPARATOR DEPENDS ON A

A

RAPID CHANGE IN THE DIRECTION OF AIR FLOW

22
Q

OF THE PARTICLES LISTED BELOW THE SMALLEST ARE THE ________ PARTICLES

A

AEROSOL

23
Q

A FILTER CAN STOP 100% OF THE PARTICLES DOWN TO A SPECIFIED MINIMUM SIZE. THIS SIZE IS CALLED THE FILTER’S ______RATING

A

ABSOLUTE

24
Q

AN ADVANTAGE OF WETTED FILTERS OVER DRY FILTERS IS THAT WETTED FILTERS

A

CAN BE CLEANED MANY TIMES

25
Q

A FINE MIST LUBRICATOR SHOULD BE USED IN A PNEUMATIC SYSTEM IF THE AIR FLOW IS _______ AND/OR THE DISTANCE TO THE EQUIPMENT IS_________

A

INTERMITTENT; LONG

26
Q

LAMINAR AIRFLOW IN A PIPING SYSTEM IS MADE TURBULENT BY

A

CONSTRICTIONS IN THE PIPE

27
Q

GREATER PRESSURE LOSSES OCCUR IN A PNEUMATICS SYSTEM IF THE AIR IS AT ______ PRESSURE BECAUSE OF GREATER________.

A

LOW; FRICTION

28
Q

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

A

DOWNWARD; 10

29
Q

WHEN SHOULD YOU USE PIPE JOINT COMPOUND IN CONNECTING NPT-THREADED PIPE

A

ALWAYS

30
Q

IF AN AIR HOSE IS NOT COMPLETELY DEPRESSURIZED WHEN YOU DISCONNECT IT THE GREATEST DANGER TO YOU IS A SUDDEN

A

BLOWING OF DUST OR CHIPS

31
Q

A FOUR-WAY VLV HAS FOUR

A

CONNECTING PORTS

32
Q

THE _______ VLV IS A GOOD THROTTLING DEVICE AND IS SUITABLE FOR HIGH-PRESSURE SERVICE IT CAUSES ______ PRESSURE LOSS IN THE LINE.

A

NEEDLE; HIGH

33
Q

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

A

SLIDING;EASY

34
Q

AN ADVANTAGE OF FOUR WAY VLVS OVER TWO AND THREE WAY VLVS IS THAT THEY

A

SIMPLIFY THE CONTROLS

35
Q

A VLV HAS FIVE CONNECTING PORTS TWO OF WHICH ARE EXHAUST PORTS. THIS VLV IS A ________ VLV

A

FOUR-WAY

36
Q

THE CRACKING PRESSURE OF A SIMPLE POPPET TYPE RELIEF VLV IS DETERMINED BY THE

A

SPRING ADJUSTMENT

37
Q

A DIAPHRAGM TYPE RELIEF VLV RESPONDS VERY QUICKLY TO A PRESSURE CHANGE BECAUSE OF ITS

A

LARGE PRESSURE SENSITIVE AREA

38
Q

THE ONLY PURPOSE OF A PRESSURE RELIEF VLV IS TO

A

PROTECT THE SYSTEM FROM DAMAGE

39
Q

AN INCREASE IN PRESSURE ON THE SECONDARY SIDE OF A PRESSURE REGULATING VLV ______ THE VLV

A

SLIGHTLY CLOSES

40
Q

THE BEST WAY TO GUARD AGAINST EXCESSIVE PRESSURE ON THE SECONDARY SIDE OF A PRESSURE REGULATOR IS TO

A

USE A REGULATOR WITH A BUILT IN RELIEF VLV

41
Q

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

A

GREATER THAN

42
Q

AN INTERNAL SPRING IS SOMETIMES USED TO RETURN THE PISTON IN A ______-ACTING _______-ROD PNEUMATIC CYLINDER

A

SINGLE;SINGLE

43
Q

THE MAIN PURPOSE OF AN EXHAUST FLOW CONTROL METERING VLV ON A PNEUMATIC CYLINDER IS TO

A

LIMIT THE RETURN STROKE SPEED

44
Q

A CYLINDER THAT MUST BE FREE TO PIVOT REQUIRES A _________ MOUNTING

A

TRUNNION OR CLEVIS

45
Q

YOU CAN DETERMINE WHETHER A CONTROL VLV CAN DELIVER AIR RAPIDLY ENOUGH FOR A CYLINDER BY CALCULATING THE ________ REQUIRED BY THE VLV

A

CAPACITY COEFFICIENT

46
Q

THE HIGHEST TORQUE A PNEUMATIC MOTOR CAN EXERT ON A LOAD IS IT _______ TORQUE

A

STALLING

47
Q

THE HORSEPOWER OF A PNEUMATIC MOTOR VARIES WITH THE ________ AND THE ______ OF THE MOTOR SHAFT.

A

SPEED;TORQUE

48
Q

THE HIGHEST POWER OUTPUT OF A PNEUMATIC MOTOR OCCURS WHEN ITS SPEED IS

A

MEDIUM

49
Q

AN AXIAL PISTON PNEUMATIC MOTOR TRANSMITS FORCE FOR THE PISTON TO THE OUTPUT SHAFT BE MEANS OF A

A

CAM PLATE AND GEARS

50
Q

AIR PRESSURE OF 100PSI CAN CREATE HYDRAULIC PRESSURE OF 1000PSI IF AN AIR PISTON DRIVES A ________ HYDRAULIC PISTON

A

SMALLER DIAMETER

3rd 6 MONTHS (13 decks)

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