NATE CORE STUDY GUIDE(correct
d d d
answers)to pass
d d
Which dof dthe dfollowing dis dnot dthe dproduct dof dincomplete dcombustion: d- dcorrect
danswer dOxides dof dnitrogen
An doil dtrap dis drequired dat dthe dbase dof dthe ddischarge dline dof dthe dvertical driser dis
d_____ dor dabove d- dcorrect danswer d8 dfeet
A ddiode dallows dcurrent dto dflow din done ddirection: d- dcorrect danswer dTrue
1 dWatt d= d_____ dBtu d- dcorrect danswer d3.41
Current din da dclosed dcircuit dis dlimited dby dwhich dof dthe dfollowing: d- dcorrect danswer
dresistance
An doil dseparator dis dlocated din dthe d_____: d- dcorrect danswer dDischarge dline
______ dis dthe dheat dthat dis dabsorbed dor dextracted dwhen da dsubstance dchanges dits
dstate: d- dcorrect danswer dLatent dheat
_______ dis dthe dtemperature dat dwhich doil dstarts dto dproduce da dwaxy dsubstance dthat
dmay dinterfere dwith dthe drefrigeration dsystem: d- dcorrect danswer dFloc dPoint
1 dkWh dof delectric dpower dis dequivalent dto d______ dBtu dper dhour: d- dcorrect danswer
d3412
What dwill dbe dthe dresistance din dthe dcircuit dif dthe dsupply dvoltage dis d30V dand dcurrent
dflowing dthrough dthe dcircuit dis d5A: d- dcorrect danswer d6 dOHM
Gas dvalves doperate dat d_____ dvoltage: d- dcorrect danswer d24V
_______ duse dtwo dspecial dhelical drotors dthat dintroduce dsuction dvapors dthen dcompress
dthem: d- dcorrect danswer dScrew dCompressor
A dhigh dpressure dsteam dboiler doperates dat da dpressure dgreater dthan d______ d: d-
dcorrect danswer d15 dPSIG
In dFire dtube dboiler, dwhich dof dthe dfollowing dpass dthrough dthe dtubes: d- dcorrect danswer
dFlue dGas
1 dkilo dwatt d= d______ dBtu d- dcorrect danswer d3140 dBTU
,Turning dthe dTXV dvalve dstem din d_______ ddirection dincreases dsuper dheat: d- dcorrect
danswer dClockwise
Which dof dthe dfollowing dcompressor duses dpistons, dcylinders dand dvalves dto dcompress
dthe drefrigerant dgas: d- dcorrect danswer dReciprocating dCompressor
Most dof dthe dheat dtransfer dfrom dthe dheat dexchanger dis dby dwhich dof dthe dfollowing: d-
dcorrect danswer dConvection
Relays dand dcontactors dare d____ dcontrol dswitches: d- dcorrect danswer dElectrically
dOperated
Which dof dthe dfollowing dlaw dstates dthat dthe dtotal dpressure dof da dconfined dmixture dof
dgases dis dthe dsum dof dpressures dof deach dof dthe dgases din dthe dmixture: d- dcorrect
danswer dDaltons dLaw
At d32°F, d1 dlb dof dice dcan dbe dchanged dto d1 dlb dof dwater dby dadding d____ dBtu d- dcorrect
danswer d144 dBTU
Which dof dthe dfollowing dcircuit ddoes dnot dhave dmultiple dpaths dfor dcurrent dflow: d-
dcorrect danswer dseries
Dual dvoltage dthree dphase dmotor dhas d_____ dnumber dof dterminals d- dcorrect danswer d9
Which done dof dthe dfollowing dis dknown das dthe dline dthat dconnects dbetween dthe
dmetering ddevice dand dthe devaporator: d- dcorrect danswer dInlet dline
Approximately d_____ dvoltage dis drequired dfor dcreating da dspark don da dspark dignition
dsystem: d- dcorrect danswer d15,000V
Which done dof dthe dfollowing din dthe drefrigeration dcycle dchanges dthe drefrigerant dfrom
dlow dpressure dgas dto dhigh dpressure dgas: d- dcorrect danswer dCompressor
Heat dtransfer dthat dtakes dplace din dliquids dand dgases din dwhich dof dthe dfollowing: d-
dcorrect danswer dConvection
Which dof dthe dfollowing dis dused dto dmeasure dthe dpressure ddrop dacross dthe dair dfilter: d-
dcorrect danswer dManometer
What dwill dbe dtypical drange dof dthe dcurrent dsensor: d- dcorrect danswer d4-20 dmA
RTD dwhich dmeasure dtemperature dhave da dpositive dtemperature dcoefficient: d- dcorrect
danswer dTrue
______ dtemperature dis dthe dtemperature dis dthe dtemperature dbelow dwhich dmoisture
dcondense dout dof dair d- dcorrect danswer dDew dBulb
, Curved dboundary dIn dPsychrometric dchart dindicates dwhich dof dthe dfollowing: d- dcorrect
danswer dDew dpoint dtemperature dline
_____ dis da dcombination dof dboth dsensible dheat dand dlatent dheat: d- dcorrect danswer
dEnthalpy
The dheat denergy dchange dthat dis dassociated dwith da dchange din dthe dphase d(state) dis: d-
dcorrect danswer dLatent dHeat
In dwater-tube dboilers, dpressures drange dfrom d______ d: d- dcorrect danswer d50 dto d5,000
dpsig
Which done dof dthe dfollowing dis dused din dsystems dfor dpressurizing dthe dbuilding: d-
dcorrect danswer dExhaust dor drelief ddampers
The dtemperature-resistance dcharacteristic dof da dthermistor dis d_________ d: d- dcorrect
danswer dNon dlinear
At d_________ dthis dsuperheated drefrigerant dvapor dpressure dand dtemperature dis
dadded: d- dcorrect danswer dCompressor
For devery d1000 dfeet dabove dsea dlevel,the dcapacity dof da dnatural dgas dfurnace dis dde-
rated dby d_______ d- dcorrect danswer d4%
If dthe dsurrounding dair dis dcolder dthan dthe dskin dtemperature, dthe dbody dgains dheat: d-
dcorrect danswer dFalse
The dpower ddeveloped dby dthe dcentrifugal dpump dis dproportional dto d_________ dits
dspeed: d- dcorrect danswer dCUBE
Mineral doils dare dnot dto dbe dused dwith dHFC dalternate drefrigerants: d- dcorrect danswer
dTrue
Flue dgas dtemperatures dat dwhich dthe dhigh-efficiency dfurnaces doperate dtypically dis: d-
dcorrect danswer d100 dto d275 ddegrees
Which dof dthe dfollowing dtype dof dcontrollers dare dused din dHVAC dapplications: d- dcorrect
danswer dPI
According dto dASME, dsafety dvalve dof dthe dboiler dshould dbe dtested dfor devery d_____
ddays: d- dcorrect danswer d30
In dPsychrometric d________ dindicates dwhich dof dthe dfollowing: dDew dpoint dtemperature
dline: d- dcorrect danswer dChart dcurve dboundary
d d d
answers)to pass
d d
Which dof dthe dfollowing dis dnot dthe dproduct dof dincomplete dcombustion: d- dcorrect
danswer dOxides dof dnitrogen
An doil dtrap dis drequired dat dthe dbase dof dthe ddischarge dline dof dthe dvertical driser dis
d_____ dor dabove d- dcorrect danswer d8 dfeet
A ddiode dallows dcurrent dto dflow din done ddirection: d- dcorrect danswer dTrue
1 dWatt d= d_____ dBtu d- dcorrect danswer d3.41
Current din da dclosed dcircuit dis dlimited dby dwhich dof dthe dfollowing: d- dcorrect danswer
dresistance
An doil dseparator dis dlocated din dthe d_____: d- dcorrect danswer dDischarge dline
______ dis dthe dheat dthat dis dabsorbed dor dextracted dwhen da dsubstance dchanges dits
dstate: d- dcorrect danswer dLatent dheat
_______ dis dthe dtemperature dat dwhich doil dstarts dto dproduce da dwaxy dsubstance dthat
dmay dinterfere dwith dthe drefrigeration dsystem: d- dcorrect danswer dFloc dPoint
1 dkWh dof delectric dpower dis dequivalent dto d______ dBtu dper dhour: d- dcorrect danswer
d3412
What dwill dbe dthe dresistance din dthe dcircuit dif dthe dsupply dvoltage dis d30V dand dcurrent
dflowing dthrough dthe dcircuit dis d5A: d- dcorrect danswer d6 dOHM
Gas dvalves doperate dat d_____ dvoltage: d- dcorrect danswer d24V
_______ duse dtwo dspecial dhelical drotors dthat dintroduce dsuction dvapors dthen dcompress
dthem: d- dcorrect danswer dScrew dCompressor
A dhigh dpressure dsteam dboiler doperates dat da dpressure dgreater dthan d______ d: d-
dcorrect danswer d15 dPSIG
In dFire dtube dboiler, dwhich dof dthe dfollowing dpass dthrough dthe dtubes: d- dcorrect danswer
dFlue dGas
1 dkilo dwatt d= d______ dBtu d- dcorrect danswer d3140 dBTU
,Turning dthe dTXV dvalve dstem din d_______ ddirection dincreases dsuper dheat: d- dcorrect
danswer dClockwise
Which dof dthe dfollowing dcompressor duses dpistons, dcylinders dand dvalves dto dcompress
dthe drefrigerant dgas: d- dcorrect danswer dReciprocating dCompressor
Most dof dthe dheat dtransfer dfrom dthe dheat dexchanger dis dby dwhich dof dthe dfollowing: d-
dcorrect danswer dConvection
Relays dand dcontactors dare d____ dcontrol dswitches: d- dcorrect danswer dElectrically
dOperated
Which dof dthe dfollowing dlaw dstates dthat dthe dtotal dpressure dof da dconfined dmixture dof
dgases dis dthe dsum dof dpressures dof deach dof dthe dgases din dthe dmixture: d- dcorrect
danswer dDaltons dLaw
At d32°F, d1 dlb dof dice dcan dbe dchanged dto d1 dlb dof dwater dby dadding d____ dBtu d- dcorrect
danswer d144 dBTU
Which dof dthe dfollowing dcircuit ddoes dnot dhave dmultiple dpaths dfor dcurrent dflow: d-
dcorrect danswer dseries
Dual dvoltage dthree dphase dmotor dhas d_____ dnumber dof dterminals d- dcorrect danswer d9
Which done dof dthe dfollowing dis dknown das dthe dline dthat dconnects dbetween dthe
dmetering ddevice dand dthe devaporator: d- dcorrect danswer dInlet dline
Approximately d_____ dvoltage dis drequired dfor dcreating da dspark don da dspark dignition
dsystem: d- dcorrect danswer d15,000V
Which done dof dthe dfollowing din dthe drefrigeration dcycle dchanges dthe drefrigerant dfrom
dlow dpressure dgas dto dhigh dpressure dgas: d- dcorrect danswer dCompressor
Heat dtransfer dthat dtakes dplace din dliquids dand dgases din dwhich dof dthe dfollowing: d-
dcorrect danswer dConvection
Which dof dthe dfollowing dis dused dto dmeasure dthe dpressure ddrop dacross dthe dair dfilter: d-
dcorrect danswer dManometer
What dwill dbe dtypical drange dof dthe dcurrent dsensor: d- dcorrect danswer d4-20 dmA
RTD dwhich dmeasure dtemperature dhave da dpositive dtemperature dcoefficient: d- dcorrect
danswer dTrue
______ dtemperature dis dthe dtemperature dis dthe dtemperature dbelow dwhich dmoisture
dcondense dout dof dair d- dcorrect danswer dDew dBulb
, Curved dboundary dIn dPsychrometric dchart dindicates dwhich dof dthe dfollowing: d- dcorrect
danswer dDew dpoint dtemperature dline
_____ dis da dcombination dof dboth dsensible dheat dand dlatent dheat: d- dcorrect danswer
dEnthalpy
The dheat denergy dchange dthat dis dassociated dwith da dchange din dthe dphase d(state) dis: d-
dcorrect danswer dLatent dHeat
In dwater-tube dboilers, dpressures drange dfrom d______ d: d- dcorrect danswer d50 dto d5,000
dpsig
Which done dof dthe dfollowing dis dused din dsystems dfor dpressurizing dthe dbuilding: d-
dcorrect danswer dExhaust dor drelief ddampers
The dtemperature-resistance dcharacteristic dof da dthermistor dis d_________ d: d- dcorrect
danswer dNon dlinear
At d_________ dthis dsuperheated drefrigerant dvapor dpressure dand dtemperature dis
dadded: d- dcorrect danswer dCompressor
For devery d1000 dfeet dabove dsea dlevel,the dcapacity dof da dnatural dgas dfurnace dis dde-
rated dby d_______ d- dcorrect danswer d4%
If dthe dsurrounding dair dis dcolder dthan dthe dskin dtemperature, dthe dbody dgains dheat: d-
dcorrect danswer dFalse
The dpower ddeveloped dby dthe dcentrifugal dpump dis dproportional dto d_________ dits
dspeed: d- dcorrect danswer dCUBE
Mineral doils dare dnot dto dbe dused dwith dHFC dalternate drefrigerants: d- dcorrect danswer
dTrue
Flue dgas dtemperatures dat dwhich dthe dhigh-efficiency dfurnaces doperate dtypically dis: d-
dcorrect danswer d100 dto d275 ddegrees
Which dof dthe dfollowing dtype dof dcontrollers dare dused din dHVAC dapplications: d- dcorrect
danswer dPI
According dto dASME, dsafety dvalve dof dthe dboiler dshould dbe dtested dfor devery d_____
ddays: d- dcorrect danswer d30
In dPsychrometric d________ dindicates dwhich dof dthe dfollowing: dDew dpoint dtemperature
dline: d- dcorrect danswer dChart dcurve dboundary
