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M ECHANI
TH ERM
CAL ENGI NEERING
AL AND FL UI D SYSTEM S
PRACTICE EXAM
A psychromdricchat (normd temperdureranged
provi ded on page 50 f or yanr possi bl e
essurr€ sea
lvr.vw.$q:th${.ccm
ue.
U
nless
elwd)
is
othervrri
e,
[*pyright 0
201
$ded
lerd corditions
7.,*,li rights rwwved.
FE
drenicd * Therm*l srr* Flui{i &Ss*s * Fbadi* Lxar *u$icn*
L4
001.
$rdn hadening
(A)
(B)
,,",rwr*r. Sl
*yth$S. c*n':
occurswh€n:
TheultimdetensileSrength can beedimded from the Brindl hadness number.
A mderid
has been Sresed
bqond the yid d $rength to sme
poi nt i n the pl
a$ic rqion, and
then the load is removed.
(C)
A pat iscydicdly loded sotheSressiskept bdow theenduranelimit, thushaving a
nomindly infinitelife
(D)
Ma<imum
*rer dressthory predidsthesfrs
$rengrth
asonehdf of thetensileyidd $rength.
002. The compresd bi I ity f #tor, Z'.
(A)
(B)
lsthe rdio of inertid
Allowsfinding the
foreto visusfore
deru point
in aflow fidd.
tenrpeduredong the 100% rddive humidity line in a
prychromdricchat
(C)
(D)
lstypicdly negleded wfen theMah number issrndl.
Accountsforthederidion of red gasesfrom i@-gabefrarior.
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rights re*rved.
l)E Mechx":ic*i ^ Thefnrd ;nd fl*il.I
003.
gr$e*rs* i\'a*ire Sx*r *ucx{i*n*
A rerotdy locded frcility ha no eas/ access to dedricity. Thry
provide nrechanicd po\rver to a group of pumps Option
and
v,'i'rv',
$aythclL <ln
are considering two optionsto
A is to drive the pumps with a diesd
engine
o$ion B is to coude the px.rmps to a ga turbine. The pumps require a power inpt of 450 hp to
operde troperly.
The
t$l
e bd
or
pnovi des some i nf
ormdi on rqgadi ng the opti ons
Yaly MdntenanceCoS
Fud
Fud Co$s
Fud HedingVdue
Ex@ed Life
$5,000
Diesd
$2.60 per gdlon
16,000Btupagdlon
15yas
For both ryderng it i s o<@ed thd the sd
$9,000
Ndurd Gas
$2.25 per million Btu
20,O0OBtuperpound
vqe vd ue wi | | be equd to the book
15yers
vd ue
dter
1
5 yeas of
deprecidion. Acmrding to mmpany policy, deprecidion is to be cdculded with the doubleddining
bdance rndhod. The thermd dficiency (percert4e of energy in the
rnedtanicd erwgy)
fortteDiesd engireplart is$o/owhileit is65%forthegaturbine
Using an intered rde of
(A)
(B)
(c)
(D)
fud thd is converted to usdul
60lo,
the
get
worth of 'the sdvage vduefor the gaturbine is rnod nerly:
$4,877
$11,500$27,500
$235,000
\
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ad
Fli*id
&S*lrr-
Pr"alice Exar Que$i*n*
r.rww. $i
4rth#i:^cr:nr
004. Fat of the f$ricdion drarving for a rnachine pat is *rown bdow. The draring indudes ar
isordric visr, md three orthogond via,vs One of the orthogond
*rded region.
visrvs has been covered with a
rct
tn
i--
t____t
Fwr d terndi
ves f or tlre mi ssi ng vi sr
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thd *roul d be pl d
&S*sn**
lt*ice
hxm.:"1
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Quc*icn*
on the $aded aea i s rno$ nealy:
(A)
(B)
(c)
(D)
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Pf Mx*a:icd *Thsnrd ard Fir"rld $ystr*+r** ltxtlce i:xryri Que$ions
A
005.
supplier to the antomotive indu$ry
us
v.'\lJ /ir Sl
dt ptt cods to f*ricde Also
t*le
*rorn isthe profit thesupplier
md<eswhgt sdling thepart to itsqt$omers
bdow summaizes how much
Part
d rnod $1200
10
Profit ($)
50
30
(A)
(B)
(C)
(D)
006.
to 100 pats per day. For profit*rility, the totd number of
asilnethd wery prt mdeissold. Thecompany can
thee pats The number of patsA ard B thd mud be mde
nerly:
of pat B.
70 of pat A, and 30 of pat B.
50 of patA, ild 20 of pat B.
20of patA,adS0of patB.
30 of pat A, trrd 70
A
cooling cfranber in a
anbielt plant ternperdure A
s,rdr
up
70. You mry
per day in md<ing
dd ly to mad mize profits is mod
Part B
20
patsmdeper day mud bed leas
+end
A
Cost to Fabricate ($)
nrdrine ha the carcity to podue
Lonl
the sane 3D mdd antting mdline to md<e two
different pats A, and B. The
The
ilytnd{.
phammrticd
rnanr.rfaduring pooess is normdly
305
loruer
pro6 u@ re$lted in a monrentay rise of the charber
thd tlre temperdure differenoe, in oF, with the anrbient wa redud by
75Yo bdone
thal the
ternperdure
rdurning to
qC,
o(perienced in the
normd. The lolrled tenrperdure differene with artient dart tenrperdure, in
cl'ranrber during the process upsd is
(A)
(B)
mo$ nerly:
-13.6
4.2
(c) 7.5
(D) 225
wivw.$l4rthePfi.corn
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F€
i,'l
007.
whxric*i * ?h*rmd ;xrd Fl uid *stlxns * ft"&tl ff] fxs\"i *ueSi *ns
r,;*nv.
Si
qrth#["cor:l
A vacrlum of 25 kPaismeasrred d alocdion wherethedwdion'is3@0 m, wherethe
dmospheric pressrrre is 70.7 kPa, The
*6dute presilre (mmHg)
at
thd locdion is np$ ne€rly:
(A) 0.34s
(B) 45.7
(c)70.7
(D) 343
The$dt
008.
filled
94
of acylirdricd viscomder is6 ft 7 in long. Thed'rdt diander is 1.6 indres
is0.0079 incfresmd contains SAE 10W-4O
horsepower needed to
rotdethedldt d
Theflui*
oil d 105F (dynmricvisosity = 69 cfl. The
1200 rpm is rno$ nealy:
(A) 0.25
(B) 0.e
(c)
1.5
(D) 2.0
0@. A Pltot Sdictubein an dr flow $rean indicdesaddic preserreof 17 peig and a$4ndion
pressurecf 25
psg.TheMdr
number fortheflcnr
d thelocdion of tfreHtot $dictubeismo$ nealy:
(A) 0.58
(B) 0.70
(c) 0.75
(D) 0.85
r*ww.SlaytheF[.cnr*
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snarlcd -
Thsr":ral exi F!uid
*Srwn * [Ya$ice f,xan Qudicns
wwr,v.${aythd€.com
010. A normd *rock ware trards d 600 nr/s through S4nant 20 oC dr. The vdocity (n/s) induced
b$i
nd the
$ock weve
i
s mo$
nerl y:
( )2u"
(B) 3s7
(c) 343
(D) 600
011.
A
v€rcuum
clsrer isc+deof crding
avacuum of 0.3 ps
jud insidethefpe. Thema<imum
vd ocity (nVs) thd could be qpeded in the hose i s rncd ned y:
(A) 58
(B) 34
(c) 1el
(D)
11
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res*v*
i:€ \{ x$e*l m} * f h*rrnal
.x:ej
[i i::* *y-**xs * i\mt] cp Lx*n *u**{i*ns
012. A vdve mmufadurer
us
ivw-v.$i4,lh$€.c*m
the rig $ro,vn bdow to ted thdr vdves The working fluid is wder
( kinerndic viscosity = 1.12 c$, dendty = 62.4lUft3 ). Tl'ueflow rde is400 gdlons per minute, ald dl
piping is4-in, sdredule4O, $ed pipe (lD = 4.026 in). Theted sdion (behrtrear pressure galges PG001
atd PG002) is 1,000 fed long of horizontd, drdght pipe. For thetes conditions, the Moody fridion
fador is knorn to be 0.018. Upon driering $eady $de flow, the preswre readings aeTO psig for
PG001 and 25 psig for PG002. For
thevdve bdng teded, theequivdent length in fed is moS rerly:
(A) 0
(B) 110
(c)22o
(D) 1,000
Valve beingItested
l
PGOOl
I
I
Water from
To plant water
pipe network
remote reservoir
PumpA
vrv,rw $l4rihePE-ccm
C*pyrlght S 2*17. Ali right*
rxrvd.
PE
Ms*ra:icd
013.
*-Thc"r'n:d ;*^rd
A solid coppe
fi*i* Sg$rws* **$ice
sph€re
with a dianrder,of 1 inch is initidly d a spdidly uniform tenrpedure of
150"F bdore bdng inerted into a Sretrn of
indicdes a temperdure of 130'F
Btu/(ft2h'F)
is rnc$
wwvr SaythePE.com
[:xan Que*i*ns
dr d 80'F. A themocouple d
6tq 1 minute and 10 sords
the $rface of the +here
The hed tra,$er codficient, in
nerly:
( )12
(B) 120
(c) 558
(D) e55
0l4AGincfrthickbrickwdl sepadesthehotgreinsidearirdu$rid furnrefrorntheanhtentdrand
its surroundingq whidt ae d.Tl"F. The brick wdl has a knonrn thermd condt^divity of
0.7Btuft/(ft2h"F;
and
ternperdure of the outer
asrrfa@enrisivity of 0.8. During $eady operdion of thefurnre, thesurfare
fre
of tlrewdl was rnemlred a212"F.Assuming a convedive
codficient bdween the outer
tryerdure
(
fae of the wdl
and the snrounding
dr
hd trader
of 3.5Btu/(ft2h"F), the
of the i nner face of the wd | ("F) i s nrcd nerl y:
)212
(B) 352
(c) 550
(D) 700
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015.
ehar:i cd
*
Ther"md ard fi ui*J W$$rrs
!ry&Xi
m ilxxr: Gum*i *ns
r,iwrv Salothd)[ r:cm
A thin-wdled, sphericd $or4econtdner isinitidly full of liquid nitrogen
of the @nt.ir€r is 0.5m
a thermd
ad it is covered with a 25 mm thick
vacuum
d.TlK. Thediander
foil-md instlding dankd, with
onductivity of 0.@17Wl(m.K) . The anbient temperdure aound the contdner is27'C
and the convedion codficient
dr
-
bdrrysr the outer s.lrfa€ of the insr"rlding blankd and the slrrounding
is known to be 20W/(mt X ) . A
produced by boil-off.
,
srdl
vent in the conta'ner dlorvs the esc+e of the nitrogen gas
A t*le with sdeded dda for N, is provided for your
conditionsdescribed, thetime (hours) required to
loe
1Oo/o
possible use Under the
of the liquid massof nitrogen in thetank is
mc{ nerly:
Saturation Properties for N,
( )22.5
Temp.
(K)
(B) 25.0
70
(D) 32.5
77
80
sla
A
the
sla
Enthalpy
(kJ/kg)
(m3/kg)
Liquid
(c)27.5
016.
Volume
Vapor
0.001903 0.52837
0.001236 0.22600
0.001258 0.16473
Liquid
14.14
28.U
34.85
Vapor Ahu+
222.49 208.34
228.37 199.73
230.61 195.78
wder lreder direds sola energy towads a horizontd pipe carying wder. The dfed of
energy can be +pnoximded as
a conSant
hd
flux on the prpe outer surfae of
64OBtu/(h ft'z) . Thepipediander is2.36 inchesmd it isnegligibly thin-wdled. Thewderflow rde
through the pipe isS0lbm/h with an
inld tenrpedure of 68'F md a didtagetenrpedure of 120"F
Using a dynanric visco$ty for wder of 1.16x 10-slbf 's/ft2and a thermd condudivity for wder of
0.378 Btu'
h
/ft "F, the pi pe srrf are tanrpedure (' F) d the
di
sdrage I ocdi on i s rno$ rreal y :
(
)174
(B) 1e6
(c)212
(D) 250
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* Ft*dice Exat
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Quex{ians
A cabon ded (1% C) fld plde 0.63in thick is d an initid tenrpedure of 1100"F when it is
srdderly plunged in a wder bdh with wder d 60'F. You may N"rme a convedive fr& tran$er
017.
codficient of 1800Btu/(hftz."F). Thetirne required (snds) for tlre misplmetenrpedure of the
pldeto drop to 200 "F is mo$
The f ol louri ng
t*le
naly:
has sd eded dda
(c)
ue.
possi ble
Thermophysical Properties, Carbon Steel (1% C)
(A) 4.5
(B) 8.6
for cabon Sed , for your
-
ThermalDiffusivity
17
(in'zls)
0.02
Density
(lbm/ft3)
490
Heat Thermal Conductivity
Btu/(lbm'"F) (Btu'ft)(h'ft'z'"F)
Specific
0.11
(D) 34
018.
A
12-in thick brick ecterior
wdl is used in at offie buildirg with
no insuldion or dded internd
fini*r. On a winter day, the folloruing tenrperdures were meslred: insjde dr ternperdure, 70"F;
otrtside dr tenrpedure, 15'F; indde snfre tenrperdrre, 56"F; o;td& surf*e tsrperdurq 20"F
Asmirq a tkrermd condudivity of 0.7Btu/(h.ft."F) for the brick wdl, the convc{ion hed tral$er
.
codficielt (Btu/(h-ft'?. "F)) for the inner sjdeof thewdl, is nrod ne*ly:
(A) 0.e
(B) 1.8
(c) 3.6
(D)7.2
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f€ llis*ar:icd *Then;x} *rd iluid $v$*x** llmtice Lxxx Q*Slnns
019.
A cylindricd, dmospheric-pres$retilk with adiarder of
ppe. The tank is used for tfre Sor4e
jd,fud
of
liquid
lvww.$qi{h*t:h"c*x
10 m
jd fud. During
haoneinld pipeand oneoutld
simultaneous
loding
and unloading,
d a rde of 1 m3/s through the inld pipe lf the lord inside the
tank is to rie d a rde no greder than O.Sn/minute, the lorued flow.rde (gpm) d whicfr the jd fud
mu$ bedrarvn fromtletank through theoutld ptpeismoS naly:
liquid
is ddivered to the tank
(A) Cannot beddermined
(B) 35
(c) 2,070
(D) 5,476
020.
An dr Srear of 50,000 CFM enters an sr+ordive cooler where it is sprayed with a mi$ of cool
wder. During $eady $de opedion, 4proximddy 70o/o of the wder sprayed w4ordes and mixes
withthedrwhiletherenrdningwderismllededinabasinanddrdned. Forthemnditions*roivnin
thefigure, therequired inp;t of liquid wda (gpm) ismo$ ne*ly:
(A) 2.60
(B)
3.75-
(c) 4.55
(D) 5.80
liquid water
Note A prycfrronHric cfrart
is pnovided for your posdble
uein p4e50
950F
rel. hum. = 80%
wvrw.SlaythePE ccm
{
rel. hum. = 20%
P=14.7 psia
50,000 cFM
13
Copyright S 2S'1?.
Ali right* rmrvtxl
Pf
lt'lnch*-ricd *-fhe'ffial arii
021.
iiuid SS*xs*
!Yn*:tic.e [x;xr"l
w*;w.$ry{hS}il c*m
Qr:*i*i':s
An ided Diesd cydeusesdr( R= 0.37@psiaft3/(lb"R), ce= 0.240Btu/(lb"R), k= 1.4) and
d the Sat of ttre compression
*ol
process the working
fluid is d 80"F
ute pressure acfriered i n the cyd e is 58 ba, the compression
rdio
afr
i
s
14.7 psia
mod
lf
the ma<imum
nsly:
(A) 58
(B) 18
(c) 8
(D)2.7
022. Cdtare is burned in a condant
Fesilre h.rrner ad the mmbx.rdion equdion for the
dud
process
is
CrH,,
*
16.32(Q+3.76Nr) --* 7.37CO2+ 0.65CO + 4.13Or+ 61.38Nr+ 9HrO
Thepercent e<cessdr kHng used ismod nealy:
(A)
1475
(B)
131
(c)
16
(D)
31
wlw.Sxyih#E.mnr
-) .', :.
c*i.r l: 'j" t'
---::
14
;
t:
'q'
" i.t
.i
*
"+
1\
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rxerr*.
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f'"{sjirnicd *Thryrnal al$ Fluid &Ssr:s* ilYx*ic*l:x;xr.i *ueSi*i":*
A cabondd bwer4e facility ha
023.
dways nra'ntdned d. -12"C and
5@ kg of a
gaseous
form
d
ad
d the corresponding sdurdion
pressure The tank
sies of heders md pressure
sent to a
anbient tenrpadure (22"C) and a pres$re
d the cabondion
cabondion process A floriv mder
0.1 actud m3 of gaseous
CQ
hSH ccn'l
^
for liquid cabon dioxide (COr) Sorage The tank is
liquidveor mixtureof COrwith a5% qudity. In deady $deoperdion,
from the bottom of the tank
in
a tank
r"*";lv. ${ qtt
of
regul dors
170 kPa
initidly contdns
the liquid isdrarvn
thd
dd iver the CO,
Selute for ue in
the
macfrines drorrus a continuous cons.rmption of
per hour. Under these corditionq thetime (hour$ until the
mm
inside
thetank is reduced to 50 kg is mod nerly:
(A)
(B)
4.5
68
(c)
18
(D)
1475
Thefollcnring t$le ha sdded ddafor CQ for your possible use:
Saturation Properties for CO,
\
Temp.
Absolute
Volume
cc)
Pressure
(MPa)
(m'/kg)
Entropy
Enthalpy
(kJ/kg)
(kJ/kg''C)
\yf
Liquid
Yw.,
Liquid
Vapor
Liquid
Vapor
2.359
0.000997
0.01595
167.55
436.09
0.8825
1.9187
2.429
0.001002
0.01545
169.78
435.89
0.8908
1.9137
-12
2.501
0.001007
0.01497
172.01
435.66
0.8991
'1.9086
-11
2.574
0.001012
0.01450
174.26
435.41
o.9074
1.9036
-10
2.649
0.001017
0.01405
176.52
435.14
0.9157
1.8985
-14
-13
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Capyright
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?$17. S,il righNs resex"ved
l{:
l\,'lcr*;x":i*l -Therm# xrd
024.
Flr..rid
S\$sxs* Frdice [xx.n Qu*icns
A gmthermd po,ver plant
us
wr/w
geothermd wder eldreted
a
higl.r-pressure
Sayih*f mrx
sdurded liquid
d
450'F. This wder is throttled dornrn to a pressure of 70 pda bdore entaing a sepador tatk. This
s.xdden
presuredrop resrlts in the"fldring" of the liquid into a liquidv+or mixture In the
tank the resulting
veor is sepaded from the liquid and
percert4e of geothemd wder thd
(A)
Cannot beddermined
(B)
17o/o
(c)
32%
(D)
st%
i
s
srt
i
n
directed to a turbine On a
v+or form to the
turbi ne i s mo$
ms
qador
badq the
nerly:
Vapor to turbine
Liquid to re-injection well
From Production Well:
Saturated liquid water
4500F
025.
A simfleanrmoniaveor corryesion rdrigerdion sy$em hasalod of 5tons Tlreev+ordor
tenperdureisS"F.Theannrcr,ialearesthee<pa.rsionde/icewithaqudity of Woandentersthe
@mpressor assdurded vapor. Therequired flcnru
di4ran for mmonia
is prwided in the nect
rdeof rnmonia(lbdh) isnro$ rrealy: (Note A P-h
p4efor yorr pmiHe use)
(A) 50
(B) 75
(C) 150(D) 200
w*w.$lqyth#.corn
'16
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f€
Mexha:jcaj -Tt':*rssai
x:* li*irj &rst*gn*- ltretic* *x;xn Quex$i*cs
wrvw.$i*yt\$S.c**r
026. Nea the erth's equdor, the wder d ose to the s.rrface of the ocem
to
sol ar hedi ng.
At greda depthe the water rernd
ns rd
rerd
ns
wam yetr-round, due
divd y cold. lt is proposed to td<e advant€e of
this temperdure difference a'rd build a power plant *sorbing hed from the wam wder rEtr the
slrfreand rQeding thewde hed to thedeep, cold wder. Assrming thesurfaeand dep wder aed
24'C xtd 3"C, respectivdy, the ma<imum possible thermd dficiency (%) of sucfr a plant is nnd
naly:
(A) 7.0
(B) e.0
(c)
12.5
(D) 87.5
O27.
A hed
dl tirnes
pump is used for heding a house duriqg winter. The house is to be
When the outdoor
55,000 Btt/h.
dr temperdure is 25"F the hed
lf theoutdoor dr isused athehed
to run this hed
pmp
source,
losses from the
mdntdnd d.78"F
d.
houe ae edimded to be
thethordicd minimrm
pcnver (hp) required
under the conditiqrsdescribed is nro$ nealy:
(A) 1.5
(B) 2.1
(c) 5.4
(D) 8.0
lvvl'w.SlElh#E.conr
1$
il*pyrighl0
2*1?.
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P[
l\,1
s*ari ed -
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*ili ;:v-$*::*
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6
;*'17. All riSht$ f€$€rvexJ
l)[ Meck*i*d *-ih*"*xl m$ liuid &$*xxs* ilbx{irxfxryl Qs**i*n*
028. The
Sear
povver
www.$lact*d:L,wnr
plmt *rown op€rdes as at ided rdted-regenerdive Rarkine cycle. $emr
enters the high pressrre turbine d.22A0 psia and 1100"F. The condenser preswre is 1.5
$ean discftaged from the high
pressure turbine
d
pda
Sonre
580 psia is sent to the closed feed wder heder
(FWH) and the red is sent to the boiler for refred and further e<pansjon in the low pressrre turLrine.
Additiond information is given in the figure The pecent4e of the high pres$re turbine dern
drage thd
(A)7v,
di
i
s di verted to the cl osed FM/H i s
mo$
naly:
(B) 17%
(c) 27V,
(D)
37Vo
2200 psia
1100"r
Boiler
Condenser
sat.
liq.
Pump 003
Pump 002
1
\
wttw.Sqith*P*.mnt
ttrl
-
i
l.i
'1
$,
Pump 001
# 7i" 73
1!)
ilq:yri ght
$
:017. Ali
ri
ghts
rxcv*.
Ft M*;sric{* - Thrynd xrd flxid $rst*rra* ?l#ice [x:xl Que$ions
029. An dmospheic pressrre air
$rean of 300 CFM d 65'F, with
*"lvy.,Sl.rytheP9 ccm
a humidity
rdio of 55 grdns of
moidureper pound of dry dr isto becooled by floraring over acoil. Condensdion isto bearoided, so
thecooling
proe*rdl
end with
thedr d atenrpedure5'F *ovethedqrv point. Unde these
conditionq thema<imum dlow*ledry-bulbtenrperduredropforthedr ("D ismod ne*ly:
(A) 3
(B)
9"
(c)
1e
(D)
51
Thegado4etank isf*icded by bolting togdf€r two hdf-cylindricd thin dldlsad tuo
henisptrericd *rdlsasfrorn. Thetank isdesigned for an internd opedirq pressureof 3 Ml%. The
tankismadefromamderid haringandlow$lenormd Sressof l50MPaadhe aninnerdimder
030.
of 4 m. Therequired minimum thickress(mm) of thel'renri$hericd
*rdlsisrnod
tely:
(A) 3
(B) s
(c) 20
(D)
51
rvww.SaytheP[.con'r
C*pyright O :*17. All rigi:ts
rw'vd
l)F MqJra*c;{ *Therrnal xrd flr:id
g$en:s* Ftx*irx
031.4$ed (modulusof da$icity,
1.75 in thick.
E)
$x*sx
Su*i*n*
wv,*v.
boltisuedwithoutwadlerstoclanptworigidded
SI
qrth*Pi:. c*n":
pldeq each
A s€ment 0.5 in long of thethrded sedion of the bolt rerndns under the nut, while a
segment 0.25 in long is inside the nut. Assume
hdf of the bolt in the nut contributes to dongdion. lf
k, is the $iffness of the unthreaded section of the bolt, and krthe diffness of the threaded sction
contributing to dongdion, theequivdent spring conSant k"o is
n,#?
€)
*.*
(c)ffi
(D) k,+ k,
www.SlaytheP[.com
:'1
C*pynightS 2017. All rightsrm*vd
i\: i,,ldrajcai - Thernd
032. An indu$rid boiler
Safdy
Dwiefor
www.Sl;nytl'ld:L.ccn
;lrd Fluiri $v$*ns* Fb:*ice Lxa':r Ou*ions
in$dldion isto be performed in @nformancewith theASlVlE Controls and
Automaticdly Fired Boilers (CSD-1)
$adad (rdwant
portion reproduced bdou/,
with permisdon from AstvlE). Fer the $andad, under whd drcumSane car a single sddy dtutoff
vd ve be
usd
i
n the
ga
(A) lf the i nput
i
(B) lf theinput
islora
s
strpply
Ii
ne?
greder than 5,000,0@ Btt/h
ad it
than 5,000,0@ Btr./h and
i
s not posd bl e to
ue two vdves
i
n seri es
thevdvehaaproof of do$reinterlock fundion.
(C) | f the i nput is greder than 5,000,000 Btt-/h and the vd ve has a pnoof of d o$re i nterl ock f undion.
(D) None Thisisnot dlouted by theSmdad.
CF-180 Safety Shutoff Valves
(a) Each main burner supply tine shall be equipped with a safety shutoff valve(s) that shall
compfy with the applicable provisions
of ANSI
221
.21|CSA 6.5, Automatic Valves
for
Gas
Appliances, ANSI 221.78/CSA 6.20, Combination Gas Controls for Gas Appliances, or UL 429,
Standard for Electrically Operated Valves.
(b) The burner supply line shall be equipped as indicated below for the applicable input
classification or any greater input classifications:
(1) For boiler units having inputs less than or equal to 5,000,000 Btu/hr (1 465 356
W), the main burner supply line shall be equipped with at least two safe$ shutoff valves in series that
may be in a single valve body or one safety shutoff valve with a valve seal overtravel (proof of
closure) interlock function. lf the two safety shutoff valves are in a single valve body, the two safety
shutoffvalve seats shall be in series and shall have independently operated valve shafts.
(2) For boiler units having inputs greater than 5,000,000 Btu/hr (1 465 356
W
and
less than 12,500,000 Btu/hr (3 663 389 W), the main burner supply line shall be equipped with at
least two safety shutoff valves in series that may be in a single valve body. At least one of the two
safety shutoff valves shall incorporate a valve seal overtravel (proof of closure) interlock function. lf
the two safety shutoff valves are in a single valve body, the two safety shutoff valve seats shall be in
series and shall have independently operated valve shafts.
Reprinted fronr ASIM CSD-1
-
2009 by permisdon from An'rerican Socidy of Mechadcd
Eqginas
All rightsresved.
wwrv,$*ytheFE.ccnr
.},
Ccpyrighl
e
2*1?.
,{ll righisrmervxl.
f{:
*'l eirex":i c*r}
*
Thex"mal
a'ld
Fl
';id g$*rns
-
!?aS!
cx;
llxar
wrul,v.$tqrth*PL.**m
QurSiq:ns
033. A pressrrrized, insulded hot wder tank $ores heded liquid wde d 25 pd (*mlrXe)
ild
A pump is used to td<e wder from tl're tank d
curves
a rde of 1100 gpm. The pump perforrn
n€
180oF.
ae
fridion and minor losseq the ma<imum hdght (fed) *ove the wder
srface of the sldion reervoir this pump can be locded without experiencing caritdion is mo$
nerly:
provided bdorv. Negleding
(A) 8
(B)
21
(c) 34
(D) 224
Flow Rate, GPM
s00
'':
1000
i-:
-i
1500
:
20
F
IL
E([
o
F
g2
t
15:(,
(L
T
z
190
180
NPSHR
160
150,
0
500
1000
2000
Flow Rate, GPM
wrvrv.$iaghf[.corn
**pyright 0 2017. All rights rmaved.
PF fr{ex*a":lcd
034. An
*Themral ard fluirl
S!st*ls-f}aiicefxan Qu#i*ns
w*r.tr.$,4rthdlL.cnm
arid flonr hydrallicturbinedsrdops 5,000 hp d thesfrdt when operding with a head of 40 ft.
vaidion of aid flow turbine dficiency with specific +eed is provided for your
possible use lf theturbine isto operde d peak dficiency, the rotdiond speed (rpm) is mo$ naly:
A plot drowing
(A)
(B)
(c)
(D)
tfre
300
140
100
e6
80
50
1
60
::::
70 80 90 100 110 120 130
Specific speed, N"d,US customary units
035.
A vdve manufadurer uestheted rig
drorrun bdonr to dderminethe
vdves The working fluid is wder ( kinenrdic viwsity, v = 1.12 c$,
florn rde is 400 gdlons per minute,
fld
lm
codficient K for thdr
density , p
= 62.4ltlft3 ). The
dl pprng is 4-in, sdredule 40, $ed ppe (lD = 4.0% in). A
differentid U-tube manonrder rnenures the pesurre drop across the vdve
a
8.5 inches of nucury.
The loss codf i d ent K f or the vd ve, is mod ned y:
(A) 8.5
(B) 12
(c) 6
(D) 24
Valve beins
testecl
To plantwater
PumpA
www.Sq'thepf"com
pipe network
Manometer
:4
Copyrlght
0
:{.}'X?.
All
rights rexxrvd.
l€ lltu*rx.rl** *T\*rn:ai
ard Fli;ld $y$*ms* Fr*$rcc Sxx* *ues$i*n*
i,,'rgu, Si
ayrhePf ccn
r
resvdrs ae @nneded by three ptpng segments in series As$me a Drcy fridion
fador of 0.03throughorrt dl prprng.Forthemiddles€ment, theprpelength is2,100ft andthesrmof
036. The two
the minor loss codficients E K= 2.Q. For the other two segrnentq the equivdert length is provided in
thefigure Theflow rde(gpm) ismoS nerly:
(A) Cannot beddermined
(B)
0.r/
(c)
165
(D) 345
L*ru = 6,600 ft
D = 1.5ft
L = 2,100 ft
D=6in,"
/./
= 5,400
1ft
EK = 2.0
*lvw.Slaythd&.c*m
2$
C*pyright0 2*17. All rightsrwv*d
i)f, \.{*charic$
- Therlnd
*'rd Fixj* &r**rrr**
037. FointsA md B in the Mollier
l**icn lxan Qu*ir:ns
di4rm
v'rww.$lqrth$e .c*nr
bdow represent respedivdy the inld and outld of a$ern
turbineoperding d dedy $ate Tfrereisonly oneinld and oneoutld. Theisetropicdficiency of this
turbineismo$ nealy:
r.o
t
(A)
21o/o
(B)
630/0
@
r.e 1.s
z
2.1
2.2 2.3
1650
1
16ffi
(c)71%
1
1550
(D)
t
1str
t
145S
1
ii&'t,e
't
r35S
t
r3w
1
1250
85o/o
-o
f,
m
j
CL
(g
-c
c
ul
-'
'*il
rlsor--i*,;
1100f
-
1rffi
11m
'"i7e
i j
rosoil---r*S
tw
sCIl-'{
s$01
85S
8S
7S
1 1.1 "4.2 1_3 1.4 1_5 1.6
Entropy,
www.$layth#.eonr
:{i
C*pyright S ?*17. ,{11 rightsrmwvel.
X' ii.'l*arlcxd *Thryrral ard
Flr.,rid
&$sxs^ kdire[x*"n **ext]*n*
w*",w.$laythd€.*am
03S.Wderentersthetubesof asrndl padld flcnarhedo(cha€er d.74oF
$dl
dardeof 30gpm. Onthe
side'10,700|t/hof ahedtran$eroil entersd 175T. Thehedtrandersrrfacereais94fta,
ad
the overdl hed tran$er codficient is 2@ BtL/(h'ft'z.oD. For this hed o<dranger, the number of tran$er
units (NTU) is mo$
nerly:
(A) Cannot beddermined
(B) 2.5
r
(c) 3.0
(D) 3.5
lf
needed, you may
usethefolloting vduesfor +ecific hed c, md density,
co,= 0.7 Btt-/(lb'oD
Po,= 81.1
c*d*= 1.0 Btr/(lb'oF)
p:
lbfft'
P*a-= 62.4lblft3
Also, thisisaplot of hed e,xcfranger dfetiveressforyour posdbleue:
C.i./Cr- = 0
1
(, 0.9
-.-
u;
a 0.8
c,
cq)
o
_o
+
0.25
o.7
0.50
0.6
0.75
o
o 0.5
C*n/Cr* =
ol
-r
i
:
1
c
o o.4
o 0.3
x
q)
-c
(u
o 0.2
I
Parallel-Flow
0.1
0
www.SlaytheP5.ccnr
/./
C*pyrlgfrt iO ?ill7. Al! rights resaval
!F
M
echai cS
-
Th**c:;d ard fi *id $lstesr:s
-
fk{rSi cs
039. During the night, when dedricity oods
thefreing
www"$iqrtrlreFfi.*o*r
ae low, al office building
hed, 0.88 Btr/(lbm.ofl; densjty, 67 lbn/ft3) to
During
f,x*r Cu*{i rxrs
freewater
us a chilled brine (gecific
$ored in a lage, perfedly insulded vessd.
procesq thewder in thetank goesfrom 5% iceby massto 95% ice by massand it
hire ry$enr. During the day (a the building is ocanpied
ild the brine sTdenr is inadive) the dored ice is ued to cfrill glycol which is pumped to the dr
handling unit (AHU) and provideconditioned dr to the offices. Thededgn moling lod of theAHU is
700,0m BtL/h nd it mu$ provide this continuoudy during a perrod of 10 hours At the design
td<es 5 hours of mntinuous operdion of the
condition, the wder is 95%
condition, therequired
ie by mass and goes to 5o/o ie
by
nrs
over the 10 hours
At the design
hineflou rde(gprn) isrno$ nedy:
(A) 15
(B) 25
(c) e5
(D) 165
GlycolPump
Brine Pump
www.SirythdX.con':
:8
**pyrighi0
2017.
AII righisrmeved
F€ MdieN"':ied *Therm*] xr* iluid $Vsl*yns*
040.
A
gas turbine power plant
r*ed as dlown.
fta*icesxx:: *u*$i*ns
r..,rvw.$iry{ire8il^*om
uss twedage compresdon with intermling
and
twod4e
turbine
comprwr is d 58 psig. Assunre anrbient
presflre is 15 psia For minimum comprmr po^/er, the disdrage g4e press;re (psg) of the firS
e(pilsion with
compressor
The discfrage of thesecond
$ould benro* nealy:
(A) 18
(B) 2e
(c) 33
(D) 44
Regenerator
rarxvw.SiaythePil.com
,0
Ccpy* ght Q
2t)'X
7. A tl
ri
gh{s
rm.cvxi.
P[' Mxfia:icd * Therr::ed ex:* Fiuid $oiS*n':s*"
**ice lixar Que$icns
yrw',v. S, ayihei:{"cnn
t
f
w
Sl,.r'\Ythc
P.E.
g,-nrr'. Sl ar,thePIi.com
Thi s comfl des the nprni ng porti on of the pradi ce ted.
To purcfraedddled, Sepby-$ep solutionsto
dl
the probletrs in this
pradi ce ted, vi sit www.S aytheFE.com
Thedternoon portion of theted Satsinthene<t p4e.
A pycfrromdricchat (rprnd tenrperdurerarged
provided on
p4e
50 for ycur
salwd)
is
posiHe use Unless Sded otherwise
as.rrne sm lerd conditions
wxrv.SlaythePf.ccm
3*
C*pyrigh{ S, 2il17. All ri ghts
rwv**.
P*.
M**a:it:$ * Therr:ral xrd l:li-:i<i Sl$wns* fYwli*e [xar"l *lrst]*n*
201.
A combined cycle 96 turbine plant (CCGT)
*r,,vtiJ.Seryth$fi.c*nt
runs a gas turbine power plant coupled with a
turbine power plaTt through a hed recovery Sean genedor (HRSG). The overdl
combined plant is 9,000 BtL/(kWh). The
rde for the
nd ga turbine output is 150 MW trrd the nd $emr turbine
otltput is 1@ MW. There is negligiblewade hed
Ncided
with the ga dant and thewaSe hed from
the $ear plant is rieded through a series of ryeordive
hribd,
M
$sn
mling
torrrers Under the conditions
thehed load (Million Btu/h) on themoling towersismo$ nerly:
(A) 5s8
(B) e00
(c)
1,397
(D)
z2ffi
202.
Hz,
A certa'n cod hasthefollowing andysis
'1
percent Oz, and 10 percent
(kg of drlkg of
dr. Theod
on a rn€Fs
bais
82 pecent C, 5
perert HzO,2 percert
isburned with 50 percent o<cessdr.
Thedrjud rdio
fud) ismod nerly:
(A) 10.2
(B) 15.3
(c) 25.1
(D).30.7
www.Siaytheff.ccl':r
3't
C*pyright0 2*17. All rightsrwvxi.
F€ M echa^ried
-
Therm;d
axi
d 25oC,1dm
www.$4rt\#ll.com
$***xs'- ltali*e Fxar Sudions
- and agon - speific hed: 0.52kJl(kg K) - ae
ad aemixed Seadily in ar di*dic mixing drarber, 6*rown. Thereellting gas
203. Cabon dioxideboth
Fir.:id
+eific
hed: 0.85kJ/(kg.K)
mixture is cooled to -25'C in a hed er<changa dorvnSre*n of the mixing charber. The cooling
nredium in tlre hed e<cfranger is a drean of rdrigerart R-134a whidr enters the hed e(cha€€r
liquicl-v4or mixture with 3ff/o qudity d -30qC and is didraged as a sdurded v+or
required flow rde(kg/s) of R-134aismod
naly:
-30'c
(A) 0.36
sat. vap.
6
a
d -30qC. The
R-134a
-30 "c
x=30%
(B) 0.74
(c)
1.50
Ar, 0.5 kg/s
(D) 1.e5
COr, 1 kg/s
Thefollwrting
tde hasdeded ddafor
Heat Exchanger
R-134a for your possiUeus:
Saturation Properties for R-134a
Temp.
cc)
Absolute
Pressure
(kPa)
(m3/kg)
Vapor
Liquid
-34
-30
-26
Entropy
Enthalpy
(kJ/kg)
Volume
Liquid
(kJ/kg'"C)
Vapor
Liquid
Vapor
0.9606
0.000714
0.27090
7.57
229.65
0.0320
84.430
0.000720
0.22580
12.65
232.17
0.0530
0.9558
101.730
o.000727
0.18946
17.76
234.68
0.0738
0.9514
dilt
d ardeof
69.560
2M. Wder leavestl'recor&tsr of aporver
1,600 gpm and
entersawd @ding to/ver
b/ artient dr thd entersthetorer d 68'F, ild 60 peret
rddive humidity and leares sdurded d 86"F. lf the torarc/s oolirg dficiency is 680/o, the required
d 95'F. Thewder is cooled
in thetorer
flolrr rde(pound+msper hc,rr$ of dr thro^gh thetoryer
isrpd rredy:
(A) 1,600
(B) 413,500
(c) 7e7,000
(D) 826,500
wwv.Slryth#€.conr
J1
Copyright 'f,2017
Ail
rights rxvved.
\
PS
Mdxxricd *Tler*r*l lr:*
205.
Tl€ pump
dr€Mrs
i:iL:id
$:S*mc* ii'adic* hxxn $u**i**s
7@ gpm of wder from the bajn
d
www"$iq{hS{ c*m
the bottom of the cooling tonrer and
through the condens of a $ean power plant and then to the
gray nozle d
srds it
the top of the tornrer. Al
I
pping isschedule40, nomind &in $ed pipe(lD=6.065 in). Thetotd length of prpeis800ft. All the
dbols'
teeq vdves, and fittings ae
wdl reprsrted by a totd
presslre drop across the condenser is 1 0
the
fre
psi .
The sprry nozzles
surface of the basin and tl're wder vdocity
loss codficient
d
I
K= 20 . The wder
the top of the torver
ae 30 ft *ove
d the nozles is 40 fVs Negleding fly chilg€s in
thewder propetieswith tenrperdure, m;ming a Dacy fridion
fdor
of 0.03, and ass.Jming a pump
dficiency of 80%, ttrebrakehorspower (hp) forthepump ismo$ nerly:
Cooling T
(A) 15
(B)22
(c)27
(D) 32
Pump
n=80%
206. When the
7@ gpm of
$dt
horepowe upplied to a certdn centrifugd pump is 25 hp, the pump disctrages
w*er whileopodiqg d
1200 rpm, theneiy head
'1800
rpn with
a
hed rise of 90 ft. lf the p.rmp speed is reduced to
ris(ft) ismod nealy:
(A) 20
(B) 40
(c) 60
(D) 203
www.Slqythffi.canr
33
**pyrigt"r{ O 2*1I. A:{ right* rrxe"vd
!€
Msjlanice$ *
lh*r*al ard i:lxici SV**x** kxSlce [xar *uesi*n*
'"rww SarrtheP{l rcm
207. A pumpisusedtoddiverwderfromagrouncl-ls/d, dmoghaicreservoirtoamunicipd wder
tovver, dso
d
dmospheric pressure. The height of the water surface in the toruer is 170 fed. Normdly
the pump (whose performance curve is *rown bdow) ddivers a flow rde of 1200 gpm and minor
loses ae negligible For this di$ribution sysern in normd opedion, thefriction
realY:
hd
loss (ft) is mod
Frow Rate. GPM
0
500
1000
1500
2000
(A) e
(B) 50
240
(c)
230
170
(D)220
220
20
[ 21o
82ffi
Io
I
t
15a,
(L
z
190
10
180
170
160
0
2000
150
208. An irducfion nrotor on a single
ph€
230VAC circuit ha ar
dficiary of 8ff/o ard a pore
fador of 0.85. The motor drives a wder pmp (with dficiency = 907o) whicfr inpats a pesune
of 25 Sd on tfre wder. Durirg nsnrd operdion, the current draln
U
r&
$
tfree condi ti ons, the f I orv rde (gpn) through the Wmp i s mod
rie
the rnotor is noted to be 84 a.npa
nal
y:
(A) eoo
(B) 1085
(c)
1270
(D) 1555
wv,rv'l.$lqrihSe.com
.aa
Copyr;glil
e 2.4i7 All rights rserved
![
Mech*ricxli
- Ther:n*l arrJ F1i:i* Sy$*rr**
209. Wder is
pm@
lYaJice Sx*x Sue*i*ns
www.Slrythe$S.r::m
rervdrs in a pi@ine with the following
bdween two dmospheric presslre
chaaderi$ics
Ft@ineChaderi$ics
FripelD, D (in)
12
Totd length, L (f0
230
Dacy fridion factor, f
0.03
Totd of minor losscodfidents
EK
$dic hed, 4"*inai*- 4*r* (f0
The sy$en is served by two identicd pumps in
2.5
50
padld,
running simultaneoudy. The cfrarderi$ic
qrrvefor eadr pump isgiven bdow. Thewder flow rde (gpm) in thepipdinernos nerly:
(A) 1,000
70
(B) 1,700
60
(c) 2,2W
do
50
-o N
(D) 4,400
30
20
10
Flow Rate, GPM
210. Ahedtrm$eroil d430"F(deNty=40lbn/ft3)flovysintoamanifoldwheretheflonrisdivided
into4brancfreslddedA B, C, andD.All pipingissdrdule40snless$ed pipe.Theflovventeing
the manif old is 1 0,000 | bm/h, and the
ad
f
I
ow rdes for branclres A, B, md C, ae known to be 1 000, 2000,
3000 pounds per hour, respedivdy.
sond, thesmdled nomind pipediande
lf
the vdocity in
dl
hanches is not to e<ceed 5.5
(in) for brarch D, ismo$
fed
per
naly:
()%
(B)%
(c)%
(D)'l'
wrarrv. Sl ayt heFE.
ccnr
liq
Ccpyright
$
?01
?.,Sli right$ fffiexrl*"
I
PE l\,{exi1a{cs}
-Thsm$ uxj fluid $.S*x** Sxiic*[xar Qu*i*ns
wv,rw.$qrth*$i:.c*m
211. Air (with a mass flonr rde of 0.3 kg/s) is compressed in a twodage turbocompressor with
intacooling, as *rown. The ientropic dficiency of
thefigure, thehed removed (kW) by theintercooler
edr dage is 85%. With
isrnod naly:
the conditions $rown in
(A) 10
(B) 1e
(c) 2e
(D) 40
212. Etha'e (CrHu) is hnned with 20 perwrt
mmpf de combu$ion and a totd pressure
of
14.7
e(6
psa
dr durirg a comhrdion
the ds r-point tenrperdure
fo6.
('D
Asmirg
of the prodtds
isrncd naly:
( )127
(B) 133
(c)
13e
(D) 145
www.St4rthePtr.cnr:r
3S
Capyright S 2S1?.
All dghisr*rval
FE f"'lex*a{cx* *Thessr:$
xld
Flujd
$lst*ns*l\*r*ice [x;n: *u**]*rs
,,vww. $l aqrthefrf; .c*rn
213. Odane (CrH6) is burned with dry dr. The volumdric andysis of the produds on a dry bais is
given in
thet*le
bdovv. Under these conditionq the
dr-fud rdio (kg drlkg ftd)
co,
10.02%
(B) 14.22
O,
5.62%
(c)
16.32
co
0.88%
(D) 1e.76
Nz
83.48o/o
(A)
4.76
214.
A $rear of
coof ed
1,500
lbr/h of sdurded $ern d
used, is mod nearly:
200 psia is throttled down to 20 psia and then
in a hed uchanger so thd it becomes sdurated $ean 4ain. Under these mnditiong the
which the $e*n mud be cooled (Btu/h) in the hed e(dtang€r is mod
1,500 lbm/h
sat. steam
200 psia
(A) 645
nealy:
rded.
O
sat. steam
20
20 psia
(B) 6,450
Heat Exchanger
(c) 64,500
(D) 643,400
215. A heati ng edi on consi *s of a 1 $i n.-dianrder dud thd houses a 4-kW d edric
Air entersthe heding edion
d
14.7
p$4 50'F,
ad
40%
rddive humidity with
a
resj
Sflce heder.
vdocity of 25 fVs
Thedr e<it tempedure('D ismod naly:
(A)
s
(B) 57
(c)
61
(D) 66
www.SlaTthePE.ccm
JI
C*pyrightS 2017. "{l} righlslmxvd"
Pf, Mex*:srisd *Therr:cl axd FlLrid $v$*r"ns* Itadice
216. An dr-conditioning ry$enr operdes
f-xar
d a totd
ad a humidifier thd upplies wd dean
www.Siaythd:I.**m
Qr"re$ions
press,rre
(sdurated wder
of 1 dm and consi$s of a heding dion
v+or) d.212"F. Air
enters the heding
ection d 50"F and 70 persrt rddivehumidity d arde of 1240 CFM, and it learesthehumidifying
sedion
d 68"F ild 60 perwrt rddive humidity. The rde d whicfr wder is ddd (lbtt/h) to the dr in
thehumidifying sedion ismod nedy:
sat. vapor
l2't2oF
t
I
(A) 0.32
Humidifier
(B) 6.5
(c)
12.5
(D) 1e.5
500F
680F
rel. hum. = 70%
P=14.7 psia
1240 CFM
rel. hum. = 60%
217. During an dr-conditionirq
proq
900 CFM of mnditioned
humidity is mixed with 300 CFM of outdde
dr d
80"F ard 90
dr d
65"F
ad
30
peret rddive
peref rddive humidity d a pres;re
of 1 dm. Tlerddivehumidity of theresulting mixtureisnrod nerly:
(A) 3tr/o
(B) 45Yo
(c) 53%(D)
90o/o
218. The gecific volurne of sdurded liquid anmoria
6.527x 10-6lbf
.yft2. lf
d -50"F is 0.023
the Reyrd6 number is 1,500,000
d
ft3/lbrn,
ad
a locdion within a
the viscod$ is
}in lD pipq the
msf|cnw rde(lbnr/h) of armoniaisrnod nerly:
(A) 62
(B) 743
(c) 3,713
(D) 223,000
wwrv.Slaythd?F"conr
38
C*pyright
0
20'X
7.
All
ri
ghis lmerverl
FS \'1*:kt"'ile;rl
219.
* Therm*
xTd Fluid
S!**iil** ltMic* {:xxr: Qit$i*ns
r,r,w,rr
SaythePf com
Air d 10"C ard 80 kl?rentersthediffuser of ajd enginesedily with avdocity of 2@ m/s The
inld aea of the diffus is 0.4 m2. The dr
leares tfre diffuser with a vdocity
thd is very snrdl
compaed with the inld vdocity. Thetempedure ("C) of theair learing thediffuser is mod nerly:
(A) 20
(B) 30
(c) 2e3
(D) 303
220.
$ean d.2fi psiaand 700'F $eadily entersawdl-in$lded nozzlewhoeinld aeis0.2ft'z. The
mass flcruv
rde of $ean through the nozzle is 10 lbn/s $ean leares the nozzle d.2ffi psia with a
vdocity of 900 fVs Tl'reqit tempadure('D of
the$sn ismo$ nerly:
(A) 600
(B) 662
(c) 700
(D) e62
vrww SaythePf-.conr
39
il*pyrigh{ S :*17. All riEhts rm*ved.
Pe it{er*x":ieal * ?hei"n$ a:d F!*id
$r$axs* Fradice Fxal Que$ions
www.Si4rth#L,*enr
*rovn in tfre figure. The flovrr rde of dern d the boiler
outld is 15 kg/s Theflcnlrr rdeextrded d locdion 2 is 1.5 kg/s The po^/er produced by the isttropic
221. Consider the cogeredion $eanr plant
turbine is 11 MW. The dreans
l*ded 4 and 5 are fed into a heat o<dranger
manufacturing'process Additiond informdion is provided in the figure and
tran$er rde (kW) dd ivered to the manufduring
Location
Mass Flow
(ks/s)
Enthalpy
(kJ/kg)
1
15
2
1.5
?
13.5
4
u11.4
v11.4
v11.4
u11.4
5
2739.3
6
2073.O
7
640.09
8
137.75
9
144.78
10
u7.19
11
used as a heder
t*le
for a
bdovtr. The hed
prorc is mod nealy:
15
(A) 9,540
Pump 001
(B) 12,680
(c) 26,410
(D) 45,560
ir*wv.SlaythePf.con:
40
Ccpyrighi S 2*17. Ail $ghtsrmerved.
Pfi Ms:l*ricx*
- Thennal w*
Fluid &rst**r**
ltxtrcc [xlxtr ****io**
riwvr Siiryinei:{ ccnr
?22. ln the mmbined gas ad Sern turbine (CGST) power plant sfrown, the
is dr
d
14.7 psia
ttdT/"F.
inld to the ga compressor
The pressure rdio for the gas sysenl is 5. There is a perfedly-insulded
hed recovey Sean gienerdor (HRSG) using the gas turbine o<ha.r$
a a hed source to boil and
stperhedthewderinthe$earcycle ThemassflovvrateforthederncydeisT4l,Sffilbndhadthe
power cons.rmption by the wder pump is negligible. Additiond informdion is provided in the figure
Under tfese conditionq the hed addition
cycle sy$em i s mo$
rde (Million BtL/h) in the combu$ion dranber of the gas
nerly:
h=138'l Btullbm
'1560"F
h=921.6 Btullbm
1
70sF
(A) 1,740
(B) 2,680
Pump 001
(c) 3,440
(D) 5,110
www.$tqrth*f.mm
41
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0
?017.
pill rights rmerval.
l€ k;l*:a{ca} *Thryrxrl
rsv;w.$irythdlL.ccnr
xrri Fii:id $v*ef::s- FYaSiceFxar: *ueSions
A reg€nerdive 96 turbine power flant is *ronrn bdow. Air enters the compressor d.1 W,27"C
with a mass flovv rde of 0.562 kg/s and is compresd to 4 bar. The figure contdns dditiond
223.
informdion. All the po\ /er dwdoped by the high-pressrre turbine is used to run the compressor. The
lovrr-pressrre turbine provides the
and thetenrperdure
d
the
po\^rer
odput. Eactr turbine has an isntropic dficietry of
87o/o
inld to the higl'rpress.rreturbine is927"C. The presslre (kPa) d the inld of
the I ow presrre turbi ne i s mo$
(A) e5
nd
nerly:
bar
Regenerator
16 0
(B) 185
(c) 205
4bar
209 0c
(D) 250
Air, 0.562 kgls
'1 bar
27 0C
224.
A regenedive ga
turbine po,ver
plaf is *rorvn bdow. Air
enters the
comprsr d.14.7 F,
80'F with a ffEEs flow rde of 450,000 lbrdh. The hed dded by the ombu$or is 89,100,000 Btt/h.
The figure mntdns additiond informdion. Under tlrese conditionq the regenador dfediveness is
mod nealy:
(A)75Vo
(B) 80%
60 psia
22404F
(c) 85%
(D) e0%
Air, 450,&0 lbmlhr
14.7 psi
80 0F
www.$iqtth$f.cart
f*pyrighi S
?{]x
?.,Sll rights
rmrvxi
P[
l-1ccl";*rr]cai
ancJ FIL:i*
in9C{
A four-cy!6da
225.
torque of 110
required
(A)
* T!:crnal
vrww.$l*yt\*}[.**m
$\rstems* ilracticc l]x*m *r:**ir:nr
urLr-
antonrotive spak-ignition engine is kdng designed to provide a ma(imum brd<e
ft-lbf in tlre mi*speed range (3@0 rpm) with a me€n dfedive presilre of
displmrent volumeof edt cylinder
(in3)
ismod
135
ps. The
nsly:
31
(B) 43
(c)
61
(D) 123
226.
An ided Otto cyd e ha
a compressl on
rdio of 8. At the
begi nni ng of the compressi on process, d r
isd 100 kl%ild 17"C, and 800 k.t/kg of hed istranSerred to thedr during thecondant-volume
ddition pro6, Using colGdr-$andad assumptions (condant specific heat vdues d
ternpedure), the mem df edi ve pressure (kPa) i s mo$ nerl
y
hedroom
:
(A) 338
(B) 4O4
(c) 621
(D) 800
227.
A duie gde in a 10 ft wide cand is lifted
s
8:it"
thd the hdgtrt of the wder s.rrfae immediddy
dovn$rear is 2 ft. The wder surface hdght updrean of the gde is 10 ft. When the gde is in the
position $rown, a force Fsd" of '18,300 lbf is mea.rred. Under these mnditions,
tfewder flow rde in
the cand (million gdlons per day) is mo$ nealy:
(A) 145
(B) 410
,r{
(c) 634
(D) 875
wl**;v. Sl aytheFE.conr
.t.::
C*pyright Q 2*17. Ali righisrsffred
Ff
L;l
eeharieal * Thermd xrd $iuid $dgsrns
* *a*ice Fxa's Qi"r*lcns
228. Tt:e. figure *rows a hed o(changer used
0.41Btr^/lbn/'F ) in a
d
o(cha€€r has been degrded
is no
hed
lorge nqligible
isld
Say{hePf rirnt
a cooler for hot liquid toluene (spetfic hed
plrrt. The coolat is a $remr of 60 gpm of wder d 50"F,
110"F. Over the @urse of srerd yetrq the in$ldion on the l'red
dtericd
whicft is then dsdtag€d
6
r,^rww
process
so the
mpunt of hed lo$ to the mbient from the hd
The figure provides the
pro6
dda
o<changer vessd
Under thee conditions, the rde
d whicft
naly:
(Thousand BtL/h) totheanbrient ismod
(A) 0
(B) 42
(c) 62
(D) 84
229. The top
with an
pat of a wder tank
unkncnnrn derd
is divided into two
ty i s poured i nto ore
si
conpdmentq
6
dq and the wder lerrd
ri
drorrvn in the f igure. Ncruv a
ses a
etd
fluid
n anrcunt on the otfrcr
sideto compesdefor this dfed. Asilrnethe liquid does not mix with wder. B6ed on thefind fluid
hdgtrtsdrorun on thefigurq thedensity (lbrn/in3) of thefluid added ismo$ nerly:
(A) 0.01e
(B) 0.036
(c) 0.072
(D)
0j4
t
-I
I
32 in
L
I
I
37 in
+
20 in
L
I
_t_
in
v*vw.5)ayth*[.ccm
ri
t\
I uJ Yr ..{
*-1,.'::
| -t--"
;1 ,.t
Ce.pyrighi
S :*1?. All rightsrxaved
Ft Mer*anied *Thernr*t ard fluid $l$*xs* k*!!ci* [:xa:l Que*{i*i:s
230.
Air ismmpressed $edily by acomprwrfrom
wlvr.,r $i
"
hcPb
^
**m
d.arde
comprmr is
14.7 Vd and 68'F to175 paiaand 570"F
of 3200 lbn/h. The poryer input (brd<e horqower) to the compressor is 175 hp. The
intentiondly cooled by fins on the
eryri
$rfee of the compressor,
The rde
d which the compressor is
cooled (Btr/h) ismoS nealy:
(
)
4,620
(B) 59,730
(c) 7e,860
(D) 88,540
231.ln a ddry plant, milk (specific hed., 3.77 k-U(kg"C); derdty 1035 kg/m3) d 4"C is pdeurizd
continuoudy
d
72"C
d a rde of 12Ltsfor
24 hours a day. The milk is heded to the pa*arrizing
terperdure in an dectric heder (a pdarizer). The pdelrized milk isthen cooled to 18'C in arother
hed e<chager with
the
plilt
old wder bdore it
i
ly rdri geded back to 4'C. To sive energy ad rnoney,
s fi nd
is conddering replaing tlre cooler with a regenerdor
The current and proposed
proces ae *rown
i
n the
f
i
of the dd ly hedi ng requi renrert (kwh) f or the pdanri
thd ha
an dfectiveness of 82 percent.
gure I f the regenedor is i n$d I ed, the redudi on
zi
ng
hede
i
s
mo$ nerl y:
CURRENT PROCESS:
(A) 2,610
(B) 4,680
(c) 62,700
Reftigerator
Pasteurizer
(D) 74,800
PROPOSED MODIFICATION:
Refrigerator
Regenerator
Pasteurizer
HEAT
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45
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rmmv*:
P[ Medraricd *The*"n$ ard
Fluid *v-$ens-
trta*iwfxan Qu*i*n*
wwvr.$iqrth$)S,com
232.ln a $emrinjeded gas turbine, a hed reovery demr geneator (HRSG) produces slperfeded
$ean whicfr ismixed with thedry dr (gecific hed, 0.25BtL/lbm/"F , molecula wdght 29lbrn/lbrnol)
from the compressor. The $ea'rrdr mixture is then heded in the combudor
produe power. For the purpos of this
specrfic
M.0.47 Btu/lbny"F
and
ildydq
ad srt
the Sean may be rrpdded
a
to the turbine to
an ided
ga with
For the mnditions dlo\iln, the md
mdecda wdgfrt 18 lbrdlbmd.
fradion of $ean in the mixture d the combx.r$or inld is mod nealy:
(A) 0.2
Dry air, 900,000lbm/hr
14.7 psi
(B) 0.24
Steam, 180,000lbm/hr Regenerator,
140
,
psia
750F
(c) 0.52
(D) 0.8
4ZqE
t__
r\
nn
n_I
140 psia
=22M\N
233.
A counterfloru, @noentric tube hed
e<cfranger is used to cool tlre lubricdirU
oil (specific hed 0.5
Btr/(lbm "D) for a lage bank of Sdionay Diesd engines The flonr rde of oding wder through the
inner tube (1-in diander) is 400 pounds per hcur, while the floar rde of oil throtgilr the otrter annulus
(1.77-in dander) is 200 prunds per hon. The oil ard wder enter the hed e<chager
of 210'F
ad
85"F reryedivdy. Thefilm codficients ae400
fld
7 Btr/(h
ft"D
d
ternperdures
forthewder atd oil
ddeq respedivdy. The tube lergth (ft), for a desired oil dischage tsrperdure of 14O"F, is rnod
nealy:
(A) 35
(B) 50
(c) 65
(D) 70
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C*pyrighl
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2S17.
All rightsrmrued.
Ff
M
schanitxl * ?ht:'l:lal *n* li uld S:st*xrs
-
Practice
[x*n *r:e*ti**s
wwv;
5l ayt"l-ePi'*:ont
2U.A heattran$eroil d320'Fisardl*leforheding20,000poundsperhourof wderfrom60'Fto
185'F. The heding
will
be peformed in a
drdl md tube hed qchanger with the oil in the
$dl
side
oil is 70 BtulVft2fF on the outside $rfm of the tubes and 540
F for the wder on the inside surfme of the tubes Ten tubes pm tfre wder throqgh the $d l.
The convctive codficient for the
Btu/h/ft'zf
Edr
thiruwdled tube is 1-in lD
ad
md<es
dght
pm
through the
drdl.
Use a
$dl-an*tube
correction factor F=0.87. The disdrage tenrperdure for the oil is 210'F. The tube lengrth is moS
nealy:
(A) 10.4
(B) 108
(c)
125
(D) 1250
235. Hot o<har$ g6es, whicfr enter afinne*tube, croseflow hed exchanger
120"C,
ae usd to hed wder d
a flornr
d 350'C and leared
rde of 0.9 kg/s from 30'C to 125"C. For ttrese conditionq the
overdl hed tran$er codficient is known to beU=1@W/(m?f).
tt
needed,
you may usette
following poperty vduesfor speific hed c, and density, p, which may betreded acon$ants
c*=
Under
the
1000 k-tt(kg.K)
Ps-= 0.686 kg/m3
c*d*= 4197 k./(kg'K)
P*a*= 972kglm3
conditionq the hed tran$er dfediveness is moS
naly:
(A)72Yo
(B)82Yo
(C) 92Yo
(D) Cannot beddermined
wwr,v.Slayth#.u:n'r
4?
iopyrrgltt O 2017 Atl tightsresrved
lf,
Mecha*ci* "*Thsmal md Fluid &r$er:s* iltmiice
[xar Qu*]cns
236. The condensr in a lage power plant is a $dl-an$tube
*tdl ad
30,000tubeq each o<ecuting two
pm.
www-$lqrth*FE.corn
M
o(changer, considing of a single
Thetubesneof thin wdl conSrudion with 1-in lD.
Sdurded $eam ondens to sdurded I iqui d wder on the outer srrface of the tubes with an mci ded
convedion codficjent of 1940Btu/(hr-ft2."F)
.
Thecondener duty is6.82x 10eBtu/h whileusing 238
millionpoundsper hourof coolingwderardl*led68'F. Thepressureinthe*rdl (dean)sideis1.8
psi
a
U
nder these condi ti ons, the shd | -and{ube conedi on f ador i s rnod nerl y:
(A) 0.7
(B) 0.8
(c) o.e
(D) 1.0
237 .
ln a srsi ble cool i ng
prorc of moi $ d r with no condensdi on:
(A) Rddivehumidity increaseg and, humidity rdiodecreaes
(B) Rddivehumidity dayscon$ant, ard, humidity
(C) Rddivehumidity
decree
and, humidity
rdiodsem
rdio $ayscon$ant.
(D) Rd di ve humidity i ncreceq and, humi dity rdi o drys cordant.
c+aity of 1@ tors. lf thetorer opedes d c+aity in rnbient
onditions of 70"F fld 60% rddive humidity with dr d 95"F ild 80% rddive humidity d the
238.
A moling
tourer
ha
a cooling
dischagq theanount of wder ereorded (lbn/day) ismod nerly:
(A) 845
(B) 9,310
(c)
14,510
(D) 20,300
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iE
\4
239.
tc!:*:ied * T|:sm* nrd Il uiii
Air d
is 0.4
Mk
$vst*t"vrs *" iYmtl
rx Lrxn *u*$i *irs
1 MPa and 600"C enters a converging
Tl're
rns
flcnnr
nozlewith
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Slay the PE Thermal-Fluid Systems Practice Exam Errata.
Problem 014. The numerical result for q_cond/A is incorrect. The math works out to be q_cond/A =
638 BTU/h/ft2 instead of 680 BTUft/fiA. This trickles down and in the end the correct answer is 668"F.
We've changed choice (D) to make it 670oF.
Problem 017. The problem statement has been changed to say "The time required (seconds) for the
mid-plane temperature of the plate to drop to 220"F" as the answer of 8.6 seconds was obtained for
2200F.
Problem 202.In the solution, the stoichiometric reaction for hydrogen is written as H2+0.5O2 --+ CO2,
but it should be H2+0.5O2 --+H2O, the mass of the kmol of H2O is 18 kg, so the rest of the solution is
correct.
Problem 204.In the last line of the solution, the mass flow of water is written as795,670,600 lbm/tro. ur
but it should be 795,670lbmlhour. The numerical result at the end is still correct.
Problem 205. The given velocity at the spray nozzles should be 20 ff/s in the problem statement, not
40 ff/s.
Problem 22S.The problem statement now states explicitly that it is a four-stroke engine. This was not
mentioned before.
Problem 234. The question at the end of the problem statement is a little clearer now, as it has been
changed to: "The total length (ft) of each tube is most nearly:"