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Developing |\Electrical |\Troubleshooting |\TPC |\
EXAM |\QUESTIONS |\WITH |\ANSWERS
The |\actual |\location |\and |\routing |\of |\circuits |\is |\shown |\on |\a |- |\CORRECT |\ANSWERS |\✔✔wiring |\diagram A |\power-installation |\drawing |\shows |- |\CORRECT |\ANSWERS |\✔✔only |
power |\outlets Changing |\the |\number |\of |\magnetic |\poles |\in |\the |\stator |\of |\a |\squirrel- cage |\motor |\permits |\the |\motor |\to |\run |- |\CORRECT |\ANSWERS |\✔✔two |
or |\more |\fixed |\speeds Most |\reversing |\starters |\with |\low-voltage |\remote |\pushbuttons |\are |\all |\of |\the |\following |\EXCEPT |- |\CORRECT |\ANSWERS |\✔✔mechanically |
interconnected Deterioration |\in |\a |\selenium |\rectifier |\is |\indicated |\by |- |\CORRECT |
ANSWERS |\✔✔a |\gradual |\rise |\in |\the |\input |\current In |\autotransformer |\input |\circuits, |\each |\input |\line |\should |\be |- |
CORRECT |\ANSWERS |\✔✔fused
Which |\of |\the |\following |\is |\NOT |\a |\common |\cause |\of |\mechanical |
vibration? |- |\CORRECT |\ANSWERS |\✔✔Worn |\brushes All |\of |\the |\following |\are |\common |\reasons |\why |\a |\split-phase |\motor |
makes |\a |\noticeable |\noise |\when |\operating, |\EXCEPT |- |\CORRECT |
ANSWERS |\✔✔too |\little |\end |\play On |\an |\electrical |\diagram, |\a |\control |\relay |\is |\indicated |\by |\the |
designation |- |\CORRECT |\ANSWERS |\✔✔CR The |____________ |\circuit |\of |\an |\electrical |\schematic |\is |\the |\simplest |\part |\of |\the |\diagram |\and |\the |\easiest |\to |\follow. |- |\CORRECT |\ANSWERS |
✔✔power Mixing |\brush |\grades |\in |\a |\dc |\motor |\causes |- |\CORRECT |\ANSWERS |
✔✔unequal |\load |\distribution |\among |\brushes A |\film |\of |\oil |\on |\the |\commutator |\does |\all |\of |\the |\following |\EXCEPT |- |
CORRECT |\ANSWERS |\✔✔prolong |\brush |\life Overvoltage, |\excessive |\current |\and |\too-frequent |\operation |\are |
possible |\causes |\of |- |\CORRECT |\ANSWERS |\✔✔burned |\or |\short- circuited |\magnet |\coils
Thermal |\overload |\relays |\can |\generally |\be |\reset |\after |\cooling |\for |
about |- |\CORRECT |\ANSWERS |\✔✔ 1 |\minute One |\added |\feature |\of |\newer |\motor |\starters |\is |\a |\single-phase |\sensor |\that |\detects |- |\CORRECT |\ANSWERS |\✔✔current |\unbalance A |\circuit |\that |\provides |\undervoltage |\release |\and |\has |\two |\wires |
connected |\to |\the |\pilot |\device |\that |\energizes |\the |\magnetic |\control |
circuit |\is |\said |\to |\have |- |\CORRECT |\ANSWERS |\✔✔two-wire |\control The |____________ |\contacts |\on |\a |\motor |\starter |\provide |\a |\parallel |\path |
for |\the |\current |\to |\the |\coil |- |\CORRECT |\ANSWERS |\✔✔auxiliary Most |\methods |\of |\reducing |\motor |\speed |\when |\using |\multispeed |
controllers |\involve |\the |\operator |- |\CORRECT |\ANSWERS |\✔✔pressing |
the |\STOP |\button Operating |\a |\heavily |\loaded |\motor |\at |__________ |\can |\cause |\a |\high |\slip |- |\CORRECT |\ANSWERS |\✔✔reduced |\voltage Adding |\limit |\switches |\to |\the |\control |\circuit |\of |\a |\reversing |\motor |
provides |- |\CORRECT |\ANSWERS |\✔✔overtravel |\protection
On |\a |\reversing |\starter, |\mechanical |\interlocks |\are |\used |\to |\prevent |
both |\sets |\of |\three-phase |\contacts |\from |\being |\operated |\at |\the |\same |\time. |\The |\closing |\of |____________ |\operates |\a |\mechanism |\that |
prevents |\the |\closing |\of |\the |\opposite |\contactor. |- |\CORRECT |\ANSWERS |\✔✔one |\contactor Which |\of |\the |\following |\is |\not |\typically |\used |\to |\identify |\conductors |\in |\a |\motor-control |\circuit? |- |\CORRECT |\ANSWERS |\✔✔Colors The |\NEC |\requires |\a |\fuse |\to |\be |\installed |\in |\all |__________ |\conductors |- |\CORRECT |\ANSWERS |\✔✔ungrounded A |\sequence |\of |\operation |- |\CORRECT |\ANSWERS |\✔✔is |\used |\with |\an |
elementary |\diagram One |\of |\the |\best |\ways |\to |\learn |\about |\new |\equipment |\is |\to |\begin |
troubleshooting |- |\CORRECT |\ANSWERS |\✔✔before |\installation A |\detailed |\step-by-step |\description |\of |\all |\input |\commands, |\logic |
responses, |\outputs |\and |\machine |\motions |\is |\provided |\on |\the |- |
CORRECT |\ANSWERS |\✔✔log Most |\equipment |\manufacturers |\adhere |\to |\some |\kind |\of |\standard |
for |\electrical |\prints |\and |\symbols; |\the |\most |\widely |\used |\is |\the |\one |
proposed |\by |- |\CORRECT |\ANSWERS |\✔✔JIC
The |\no-load |\current |\in |\a |\three-phase |\rectifier |\is |\typically |\ 6 |\to |\10% |
of |\the |____________ |\current, |\and |\usually |\includes |\the |\cooling |\fan |
motor. |- |\CORRECT |\ANSWERS |\✔✔full |\load Operation |\of |\an |\air-piloted |\valve |\is |\initiated |\by |- |\CORRECT |\ANSWERS |\✔✔a |\surge |\of |\air A |\riser |\diagram |\shows |\the |- |\CORRECT |\ANSWERS |\✔✔power |
distribution |\wiring |\from |\input |\through |\output On |\a |\blueprint, |\wall |\outlets |\are |\indicated |\by |\a |\circle |\with |\a |- |
CORRECT |\ANSWERS |\✔✔short |\line |\drawn |\to |\it On |\a |\building |\blueprint, |\a |\solid |\electrical |\line |\generally |\indicates |\a |
____________ |\in |\the |\ceiling, |\while |\a |\dashed |\line |\indicates |\the |\same |
thing |\concealed |\in |\a |\concrete |\floor. |- |\CORRECT |\ANSWERS |\✔✔conduit A |\one-line |\diagram |\shows |\paths |\of |\energy |\transfer |\rather |\than |
individual |\current |\paths. |\For |\example, |\to |\show |\a |\three-phase, |\four- wire |\circuit, |\it |\would |\use |\a |____________ |\line |____________. |- |\CORRECT |
ANSWERS |\✔✔single; |\for |\all |\the |\wires DC |\motors |\and |\generators |\have |____________, |\which |\cause |\special |
problems |\not |\normally |\found |\in |\ac |\machines. |- |\CORRECT |\ANSWERS |
✔✔commutators |\and |\brushes
In |\a |\shunt |\motor, |\the |\field |\windings |\are |\separately |____________ |\so |
they |\carry |\just |\a |\fraction |\of |\the |\load |\current |\compared |\to |\the |\full |
load |\current |\of |\the |\series |\motor's |\field |\windings. |- |\CORRECT |
ANSWERS |\✔✔excited An |\open |\armature |\winding |\in |\a |\dc |\motor |\is |\indicated |\by |- |\CORRECT |\ANSWERS |\✔✔a |\decrease |\in |\speed In |\the |\electronic |\timing |\relay, |\the |\time-delay |\assembly |\is |\connected |
in |- |\CORRECT |\ANSWERS |\✔✔series |\with |\the |\relay |\coil When |\troubleshooting |\combination |\starters, |\the |\number-one |
symptom |\of |\a |\problem |\is |\the |\operator |\saying, |"The |\motor |
____________." |- |\CORRECT |\ANSWERS |\✔✔does |\not |\run On |\architectural |\working |\drawings, |\an |\electrician |\is |\concerned |
mainly |\with |\the |\electrical |\drawings |\superimposed |\on |\the |- |\CORRECT |\ANSWERS |\✔✔floor |\plan When |\you |\arrive |\to |\troubleshoot |\a |\defective |\machine, |\the |\next |
thing |\to |\do |\after |\talking |\to |\the |\machine |\operator |\is |\to |- |\CORRECT |
ANSWERS |\✔✔press |\the |\START |\button
You |\can |\measure |\the |\current |\in |\the |\leads |\of |\a |\three-phase |\motor |
with |\a |\clamp-on |\ammeter; |\the |\continuity |\of |\the |\motor |\is |\tested |
with |\a(n) |- |\CORRECT |\ANSWERS |\✔✔ohmmeter On |\a |\rewound |\three-phase |\motor, |\occasionally |\an |\entire |\pole-phase |\group |\may |\be |\accidentally |\reversed. |\This |\results |\in |\overheating |\and |\an |\increase |\in |\the |____________ |\of |\the |\machine |- |\CORRECT |\ANSWERS |\✔✔magnetic |\hum A |\pneumatic |\shuttle |\valve |\is |\used |\for |\operating |\a |\conventional |
pneumatic |____________ |\or |\electrical |\relay |\from |\either |\of |\two |\control |
sources. |- |\CORRECT |\ANSWERS |\✔✔valve In |\a |\pneumatic |\circuit, |\a |\check |\valve |\allows |\flow |\in |\only |\one |
direction. |\In |\an |\electrical |\circuit, |\this |\function |\is |\performed |\by |\a(n) |- |\CORRECT |\ANSWERS |\✔✔diode The |\three |\most |\common |\causes |\of |\electrical |\failure |\in |\three-phase |
motors |\are |\shorted, |____________, |\and |\burned |\out |\windings. |- |
CORRECT |\ANSWERS |\✔✔grounded A |\gaseous |\discharge |\lamp, |\such |\as |\a |\fluorescent |\or |\an |\HID, |
requires |\a(n) |____________, |\to |\provide |\proper |\starting |\voltage |\and |
regulate |\current. |- |\CORRECT |\ANSWERS |\✔✔ballast
Which |\of |\the |\following |\would |\show |\where |\the |\power-distribution |
system, |\ducts, |\and |\manholes |\are |\located |\for |\a |\manufacturing |\plant |
consisting |\of |\several |\buildings? |- |\CORRECT |\ANSWERS |\✔✔Plot |\plan Each |\motor |\in |\the |\plant |\should |\bear |\a |\metal |\tag |\with |\the |__________ |\stamped |\on |\it |- |\CORRECT |\ANSWERS |\✔✔company's |\inventory |
number Which |\of |\the |\following |\provides |\both |\overload |\protection |\and |\short- circuit |\protection |\in |\one |\unit? |- |\CORRECT |\ANSWERS |\✔✔Combination |\motor |\starter If |\you |\close |\the |\contacts |\of |\a |\motor |\controller |\and |\measure |\a |
potential |\difference |\of |\zero |\between |\the |\motor |\terminals, |\the |\fault |
is |\probably |\in |\the |- |\CORRECT |\ANSWERS |\✔✔controller Commutator |\overheating |\is |\sometimes |\caused |\by |\the |\direction |\of |
rotation |\of |\the |\motor |\being |\changed |\without |\changing |\the |\position |\of |\the |\brushes |\to |\the |\new |____________ |\plane. |- |\CORRECT |\ANSWERS |
✔✔neutral Worn |\or |\damaged |\ball |\and |\roller |\bearings |\are |\easily |\detected |\by |
the |____________ |\they |\produce. |- |\CORRECT |\ANSWERS |\✔✔unusual |
noise
When |\preparing |\an |\elementary |\diagram, |\you |\should |\number |\all |
lines |\with |__________ |\numbers |- |\CORRECT |\ANSWERS |\✔✔consecutive The |\following |\symbol |\represents |\an |____________ |\outlet |\in |\a |
____________. |- |\CORRECT |\ANSWERS |\✔✔exit |\light; |\wall In |\addition |\to |\the |\locations |\of |\lighting |\and |\lighting |\panels, |\lighting |
diagrams |\show |\the |\locations |\of |- |\CORRECT |\ANSWERS |\✔✔telephone |
outlets The |\systematic |\testing |\of |\all |\controls |\in |\a |\building |\to |\ensure |\that |
they |\perform |\and |\interact |\properly |\is |\known |\as |- |\CORRECT |
ANSWERS |\✔✔commissioning Rapid-start |\fluorescent |\systems |\are |____________ |\circuit |\systems |- |
CORRECT |\ANSWERS |\✔✔series Most |\control |\cycle |\faults |\are |\remedied |\by |\locating |\and |\correcting |
____________ |\errors, |\which |\can |\be |\very |\difficult |\to |\diagnose. |- |
CORRECT |\ANSWERS |\✔✔switching When |\troubleshooting |\a |\starter, |\if |\line |\voltage |\is |\present, |\the |
problem |\is |\probably |\in |\the |- |\CORRECT |\ANSWERS |\✔✔? |
mechanical,hydraulic, |\or |\pneumatic
If |\you |\find |\a |\defective |\relay |\coil, |\you |\should |\replace |\it. |\Test |\the |\new |\coil |\for |\proper |____________ |\with |\a |____________. |- |\CORRECT |\ANSWERS |\✔✔current |\clamp |\on |\ammeter A |\latched |\electrical |\relay |\is |\an |\example |\of |\a |- |\CORRECT |\ANSWERS |
✔✔bistable If |\you |\suspect |\that |\a |\ground |\fault |\is |\the |\cause |\of |\a |\machine's |
electrical |\problem, |\make |\careful |\checks |\with |\the |- |\CORRECT |
ANSWERS |\✔✔power |\off When |\checking |\faults |\in |\a |\single-phase, |\split-phase |\motor, |\test |\both |\the |____________ |\windings |\for |\grounds, |\opens, |\and |\shorts. |- |
CORRECT |\ANSWERS |\✔✔run |\and |\start Memory |\can |\be |\built |\into |\either |\a |\pneumatic |\or |\electric |\control |
circuit |\containing |\only |\monostable |\devices |\by |\using |- |\CORRECT |
ANSWERS |\✔✔feedback 3 |\Whenever |\equipment |\undergoes |\circuit |\changes |\and/or |
modifications, |\make |\sure |\that |\you |\record |\the |\information |- |
CORRECT |\ANSWERS |\✔✔.....on |\the |\schematic
