FDNY A-35 MAIN TEST WITH
COMPLETE SOLUTIONS
Air vcompressors vpower... v- v vcorrect vanswer-(1) vindustrial vequipment vand v(2)
vconstruction vtools
Examples vof vequipment vpowered vby vair vcompressor v- v vcorrect vanswer-
pneumatic vwrenches, vlifts vin vauto vservice vstations, vpaint vspray vbooths
Air vcompressors venable... v- v vcorrect vanswer-(1) vefficient vrepair vof vall vtypes vof
vvehicles; vand v(2) vfacilitate vtheir vsafe voperation von vpublic vthoroughfares
Permit vis vrequired vfor vair vcompressor v- v vcorrect vanswer-that vcompresses vair
vabove v100 vPSI
, Types vof vair vcompressors v- v vcorrect vanswer-(1) vreciprocating;
(2) vcentrifugal;
(3) vsolar; vand
(4) vrotary
*Difference vis vthe vway vin vwhich vthey vcompress vair
How vdo vair vcompressors vwork v- v vcorrect vanswer-take vthe vair vin va vroom vand
vforce vit vinto va vcontainer vUNDER vPRESSURE. vThe vmore vair vforced vinto vthe
vcontainer, vthe vgreater vthe vpressure. vCompressed vair vcan vbe vdischarged vfrom
vthe vcontainer vat va vcontrolled vrate.
Most vcommon vair vcompressor v- v vcorrect vanswer-Reciprocating
Air vcompressors vare vsometimes vcalled v- v vcorrect vanswer-air vpumps
Air vcompressors vcan vbe vpowered vby: v- v vcorrect vanswer-(1) velectric vmotors;
(2) vinternal vcombustion vengines; vor
(3) vsteam vturbines
Explosions v& vair vcompressors v- v vcorrect vanswer-If vthere vis va vbuild vup vof
vflammable vgases v(ex: vin vservice vstations vand vworkshops), vthose vgases vare
vheavier vthan vair vand vfall vto vthe vfloor vbefore vspreading voutward. vThese vgases
vare veasily vignited vby vsparks vand vhigh vtemperatures--which vINCLUDES vthe vheat
vgenerated vby van vair vcompressor.
To vavoid vexplosions vw/ vair vcompressors v- v vcorrect vanswer-Raise vair
vcompressor vat vLEAST v5 vfeet vabove vground vlevel vso vthat vno vflammable vgases
vare vdrawn vinto vthe vcompressor. vTo vmeet vthe vheight vrequirement vyou vcan
vplace vcompressor von va vshelf vor vbench vOR vthe vair vreceiver vtank vmay vbe
vturned vand vstood von vend vw/ vthe vair vcompressor vbolted vto vthe vtop vof vthe vtank.
Power vto vair vcompressor v- v vcorrect vanswer-entire vunit vis vdriven vby van velectric
vmotor. vMotor vactivates va vseries vof vdrive vbelts. vBelts vpower vthe vmoving vparts
vof vthe vunit--like vw/ vpower vsteering vand valternator vin vautomobile
Compression vChamber voperation v- v vcorrect vanswer-Air vis vcompressed vin
vcompression vchamber vwhich vconsists vof va vPISTON vinside va vCYLINDER.
vPiston vmoves vup vand vdown. v
When vpiston vmoves vdown v-->draws vair vinto vcylinder, vthrough vINTAKE vVALVE
v(valve vautomatically vopens vwhen vpiston vmoves vdown).
When vpiston vmoves vup-->air vis vcompressed v(intake vvale vautomatically vcloses vto
vavoid vair vescaping vfrom vcylinder).
Air vReciever vOperation v- v vcorrect vanswer-When vair vpressure vreaches va vcertain
vlevel, vit vforces vopen va vDISCHARGE vVALVE v(which vis vspring vloaded). vThis
vreleases vcompressed vair vinto vair vreciever v(aka vair vtank), vwhich vis vwhat
vsupplies vcompressed vair vwhen vneeded.
COMPLETE SOLUTIONS
Air vcompressors vpower... v- v vcorrect vanswer-(1) vindustrial vequipment vand v(2)
vconstruction vtools
Examples vof vequipment vpowered vby vair vcompressor v- v vcorrect vanswer-
pneumatic vwrenches, vlifts vin vauto vservice vstations, vpaint vspray vbooths
Air vcompressors venable... v- v vcorrect vanswer-(1) vefficient vrepair vof vall vtypes vof
vvehicles; vand v(2) vfacilitate vtheir vsafe voperation von vpublic vthoroughfares
Permit vis vrequired vfor vair vcompressor v- v vcorrect vanswer-that vcompresses vair
vabove v100 vPSI
, Types vof vair vcompressors v- v vcorrect vanswer-(1) vreciprocating;
(2) vcentrifugal;
(3) vsolar; vand
(4) vrotary
*Difference vis vthe vway vin vwhich vthey vcompress vair
How vdo vair vcompressors vwork v- v vcorrect vanswer-take vthe vair vin va vroom vand
vforce vit vinto va vcontainer vUNDER vPRESSURE. vThe vmore vair vforced vinto vthe
vcontainer, vthe vgreater vthe vpressure. vCompressed vair vcan vbe vdischarged vfrom
vthe vcontainer vat va vcontrolled vrate.
Most vcommon vair vcompressor v- v vcorrect vanswer-Reciprocating
Air vcompressors vare vsometimes vcalled v- v vcorrect vanswer-air vpumps
Air vcompressors vcan vbe vpowered vby: v- v vcorrect vanswer-(1) velectric vmotors;
(2) vinternal vcombustion vengines; vor
(3) vsteam vturbines
Explosions v& vair vcompressors v- v vcorrect vanswer-If vthere vis va vbuild vup vof
vflammable vgases v(ex: vin vservice vstations vand vworkshops), vthose vgases vare
vheavier vthan vair vand vfall vto vthe vfloor vbefore vspreading voutward. vThese vgases
vare veasily vignited vby vsparks vand vhigh vtemperatures--which vINCLUDES vthe vheat
vgenerated vby van vair vcompressor.
To vavoid vexplosions vw/ vair vcompressors v- v vcorrect vanswer-Raise vair
vcompressor vat vLEAST v5 vfeet vabove vground vlevel vso vthat vno vflammable vgases
vare vdrawn vinto vthe vcompressor. vTo vmeet vthe vheight vrequirement vyou vcan
vplace vcompressor von va vshelf vor vbench vOR vthe vair vreceiver vtank vmay vbe
vturned vand vstood von vend vw/ vthe vair vcompressor vbolted vto vthe vtop vof vthe vtank.
Power vto vair vcompressor v- v vcorrect vanswer-entire vunit vis vdriven vby van velectric
vmotor. vMotor vactivates va vseries vof vdrive vbelts. vBelts vpower vthe vmoving vparts
vof vthe vunit--like vw/ vpower vsteering vand valternator vin vautomobile
Compression vChamber voperation v- v vcorrect vanswer-Air vis vcompressed vin
vcompression vchamber vwhich vconsists vof va vPISTON vinside va vCYLINDER.
vPiston vmoves vup vand vdown. v
When vpiston vmoves vdown v-->draws vair vinto vcylinder, vthrough vINTAKE vVALVE
v(valve vautomatically vopens vwhen vpiston vmoves vdown).
When vpiston vmoves vup-->air vis vcompressed v(intake vvale vautomatically vcloses vto
vavoid vair vescaping vfrom vcylinder).
Air vReciever vOperation v- v vcorrect vanswer-When vair vpressure vreaches va vcertain
vlevel, vit vforces vopen va vDISCHARGE vVALVE v(which vis vspring vloaded). vThis
vreleases vcompressed vair vinto vair vreciever v(aka vair vtank), vwhich vis vwhat
vsupplies vcompressed vair vwhen vneeded.
