General A&P General questions and
answers, Graded A
The rworking rvoltage rof ra rcapacitor rin ran rAC rcircuit rshould rbe r- rCorrect r rAnswer r- rat rleast r50
rpercent rgreater rthan rthe rhighest rapplied rvoltage
The rterm rthat rdescribes rthe rcombinded rresistive rforces rin ran rAC rcircuit ris r- rCorrect r rAnswer r-
rimpedance
What ris rthe ropposition rto rthe rflow rof rAC rproduced rby ra rmagnetif rfield rwith rgenerated rback
rvoltage r(EMF) rcalled? r- rCorrect r rAnswer r- rInductive rreactance
Electrostatic rfields rare rknown ras r- rCorrect r rAnswer r- relectrostatic rfields
The rbasis rfor rtransformer roperation ris rin rthe ruse rof ralternating rcurrent ris rmutual r- rCorrect r
rAnswer r- rinductance
The ropposition roffered rby ra rcoil rto rthe rflow rof ralternating rcurrent ris rcalled r(disregard rresistance) r-
rCorrect r rAnswer r- rinductive rreactance
An rincrease rin rwhich rof rthe rfollowing rfactors rwill rcause ran rincrease rin rthe rinductive rreactance rof
ra rcircuit?
Inductance rand rfrequency
Resistance rand rvoltage
Resistance rand rcapacitive rreactance r- rCorrect r rAnswer r- rInductance rand rfrequency
Capacitors rare rsometimes rused rin rDC rcircuits rto r- rCorrect r rAnswer r- rsmooth rout rslight rpulsations
rin rcurrent/voltage
In ran rAC rcircuit, rthe reffective rvoltage ris r- rCorrect r rAnswer r- rless rthan rthe rmaximum rinstantaneous
rvoltage
,The ramount rof relectricity ra rcapacitor rcan rstore ris rdirectly rproportional rto rthe r- rCorrect r rAnswer r-
rplate rarea rand rinversely rproportional rto rthe rdistance rbetween rthe rplates
Convert rfarads rto rmicrofarads rby r- rCorrect r rAnswer r- rmultiplying rfarads rby r10 rto rthe rpower rof r6
Unless rotherwise rspecified, rany rvalues rgiven rfor rcurrent ror rvoltage rin ran rAC rcircuit rare rassumed
rto rbe r- rCorrect r rAnswer r- reffective rvalues
When rdifferent rrated rcapacitors rare rconnected rin rparallel rin ra rcircuit, rthe rtotal rcapacitance ris
r(NOTE: rCt=C1+C2...) r- rCorrect r rAnswer r- requal rto rthe rsum rof rall rthe rcapacitances
When rinductors rare rconnected rin rseries rin ra rcircuit, rthe rtotal rinductance ris r( rwhere rthe rmagnetic
rfields rof reach rinductor rdo rnot raffect rthe rothers) rNOTE: rLt=L1+L2... r- rCorrect r rAnswer r- requal rto
rthe rsum rof rthe rindividual rinductances
What ris rthe rtotal rcapacitance rof ra rcertain rcircuit rcontaining rthree rcapacitors rwith rcapacitances rof
r.25 rmicrofarads, r.03 rmicrofarads, rand r.12 rmicrofarads rrespectively? r- rCorrect r rAnswer r- r.4
rmicrofarads
Which rrequires rthe rmost relectrical rpower rduring roperation? r(NOTE r1 rHP=746 rwatts)
A r12 rvolt rmotor rrequiring r8 ramperes
4 r30 rwatt rlamps rin ra r12 rvolt rparallel rcircuit
2 rlights rrequiring r3 ramperes reach rin ra r24 rvolt rparallel rsystem r- rCorrect r rAnswer r- rTwo rlights
rrequiring r3 ramperes reach rin ra r24 rvolt rparallel rsystem
How rmuch rpower rmust ra r24 rvolt rgenerator rfurnish rto ra rsystem rwhich rcontains rthe rfollowing
rloads?
1 rmotor r1/5 rHP
3 rlights r20 rwatts rea
Heating relement r5 ramp
Anticollision rlight r3 ramp r- rCorrect r rAnswer r- r450 rwatts
A r12 rvolt relectric rmotor rhas r1,000 rwatts rinput rand r1 rHP routput. rMaintaining rthe rsame refficiency,
rhow rmuch rinput rpower rwill ra r24 rvolt, r1 rHP relectric rmotor rrequire? r- rCorrect r rAnswer r- r1,000
rwatts
How rmany ramperes rwill ra r28 rvolt rgenerator rbe rrequired rto rsupply rto ra rcircuit rcontaining r5 rlamps
rin rparallel, r3 rof rwhich rhave ra rresistance rof r6 rohms reach rand r2 rof rwhich rhave ra rresistance rof r5
rohms reach? r- rCorrect r rAnswer r- r25.23 ramperes
,A r1 rHP, r24 rvolt rDC relectric rmotor rthat ris r80 rpercent refficient rrequires r932.5 rwatts. rHow rmuch
rpower rwill ra r1 rHP, r12 rvolt rDC relectric rmotor rthat ris r75 rpercent refficient rrequire? r- rCorrect r
rAnswer r- r994.6 rwatts
The rpotential rdifference rbetween rtwo rconductors rwhich rare rinsulated rfrom reach rother ris
rmeasured rin r- rCorrect r rAnswer r- rvolts
Which reffect rdoes rnot rapply rto rthe rmovement rof relectrons rflowing rin ra rconductor? r- rCorrect r
rAnswer r- rThermal renergy
A r24 rvolt rsource ris rrequired rto rfurnish r48 rwatts rto ra rparallel rcircuit rconsisting rof r4 rresistors rof
requal rvalue. rWhat ris rthe rvoltage rdrop racross reach rresistor? r- rCorrect r rAnswer r- r24 rvolts
When rcalculating rpower rin ra rreactive ror rinductive rAC rcircuit, rthe rtrue rpower ris r- rCorrect r rAnswer
r- rless rthan rthe rapparent rpower
The rcorrect rway rto rconnect ra rtest rvoltmeter rin ra rcircuit ris r- rCorrect r rAnswer r- rin rparallel rwith ra
runit
What rwill ra rvoltmeter rread rif rproperly rconnected racross ra rclosed rswitch rin ra rcircuit rwith relectrical
rpower ron? r- rCorrect r rAnswer r- rZero rvoltage
Which rterm rmeans r.001 rampere? r- rCorrect r rAnswer r- rMilliampere
A rcabin rentry rlight rof r10 rwatts rand ra rdome rlight rof r20 rwatts rare rconnected rin rparallel rto ra r30
rvolt rsource. rIf rthe rvoltage racross rthe r10 rwatt rlight ris rmeasure, rit rwill rbe r- rCorrect r rAnswer r-
requal rto rthe rvoltage racross rthe r20 rwatt rlight
A r14 rohm rresistor ris rto rbe rinstalled rin ra rseries rcircuit rcarrying r.05 rampere. rHow rmuch rpower rwill
rthe rresistor rbe rrequired rto rdissipate? r- rCorrect r rAnswer r- rat rleast r35 rmilliwatts
.002 rKV requals r- rCorrect r rAnswer r- r2.0 rvolts
A r24 rvolt rsource ris rrequired rto rfurnish r48 rwatts rto ra rparallel rcircuit rconsisting rof r2 rresistors rof
requal rvalue. rWhat ris rthe rvalue rof reach rresistor? r- rCorrect r rAnswer r- r24 rohms
Which rrequires rthe rmost relectrical rpower?
A r1/5 rHP r24 rvolt rmotor rwhich ris r75 rpercent refficient
4 r30 rwatt rlamps rarranged rin ra r12 rvolt rparallel rcircuit
A r24 rvolt ranticollision rlight rcircuit rconsisting rof r2 rlight rassemblies rwhich rrequire r3 ramperes reach
rduring roperation r- rCorrect r rAnswer r- rA r1/5 rHP r24 rvolt rmotor rwhich ris r75 rpercent refficient
What runit ris rused rto rexpress relectrical rpower? r- rCorrect r rAnswer r- rWatt
What ris rthe rbasic runit rof relectrical rquantity? r- rCorrect r rAnswer r- rCoulomb
, What ris rthe roperating rresistance rof ra r30 rwatt rlight rbulb rdesigned rfor ra r28 rvolt rsystem? r- rCorrect r
rAnswer r- r26 rohms
Which rstatement ris rcorrect rwhen rmade rin rreference rto ra rparallel rcircuit?
The rcurrent ris requal rin rall rportions rof rthe rcircuit
The rtotal rcurrent ris requal rto rthe rsum rof rthe rcurrents rthrough rthe rindividual rbranches rof rthe
rcircuit
The rcurrent rin ramperes rcan rbe rfound rby rdividing rthe rEMF rin rvolts rby rthe rsum rof rthe rresistors rin
rohms r- rCorrect r rAnswer r- rThe rtotal rcurrent ris requal rto rthe rsum rof rthe rcurrents rthrough rthe
rindividual rbranches rof rthe rcircuit
Which rof rthe rfollowing rare rcommonly rused ras rrectifiers rin relectrical rcircuits?
Anodes
Cathodes
Diodes r- rCorrect r rAnswer r- rDiodes
Diodes rare rused rin relectrical rpower rsupply rcircuits rprimarily ras r- rCorrect r rAnswer r- rrectifiers
Transfer rof relectric renergy rfrom rone rcircuit rto ranother rwithout raid rof relectrical rconnections r-
rCorrect r rAnswer r- ris rcalled rinduction
If r3 rresistors r3 rohms, r5 rohms, rand r22 rohms rare rconnected rin rseries rin ra r28 rvolt rcircuit, rhow
rmuch rcurrent rwill rflow rthrough rthe r3 rohm rresistor? r- rCorrect r rAnswer r- r0.93 rampere
A rcircuit rhas ran rapplied rvoltage rof r30 rvolts rand ra rlad rconsisting rof ra r10 rohm rresistor rin rseries
rwith ra r20 rohm rresistor. rWhat ris rthe rvoltage rdrop racross rthe r10 rohm rresistor? r- rCorrect r rAnswer
r- r10 rvolts
In ra rparallel rcircuit rwith r4 r6 rohm rresistors racross ra r24 rvolt rbattery, rwhat ris rthe rtotal rvoltage
racross rresistor r3 rin rthe rcircuit? r- rCorrect r rAnswer r- r24 rvolts
Which ris rcorrect rin rreference rto relectrical rresistance?
2 relectrical rdevices rwill rhave rthe rsame rcombined rresistance rif rthey rare rconnected rin rseries ras
rthey rwill rhave rif rconnected rin rparallel
If r1 rof r3 rbulbs rin ra rparallel rcircuit ris rremoved, rthe rtotal rresistance rof rthe rcircuit rwill rbecome
rgreater
An relectrical rdevice rthat rhas ra rhigh rresistance rwill ruse rmore rpower rthan rone rwith ra rlow
rresistance rwith rthe rsame rapplied rvoltage r- rCorrect r rAnswer r- rIf r1 rof r3 rbulbs rin ra rparallel rcircuit
ris rremoved, rthe rtotal rresistance rof rthe rcircuit rwill rbecome rgreater
answers, Graded A
The rworking rvoltage rof ra rcapacitor rin ran rAC rcircuit rshould rbe r- rCorrect r rAnswer r- rat rleast r50
rpercent rgreater rthan rthe rhighest rapplied rvoltage
The rterm rthat rdescribes rthe rcombinded rresistive rforces rin ran rAC rcircuit ris r- rCorrect r rAnswer r-
rimpedance
What ris rthe ropposition rto rthe rflow rof rAC rproduced rby ra rmagnetif rfield rwith rgenerated rback
rvoltage r(EMF) rcalled? r- rCorrect r rAnswer r- rInductive rreactance
Electrostatic rfields rare rknown ras r- rCorrect r rAnswer r- relectrostatic rfields
The rbasis rfor rtransformer roperation ris rin rthe ruse rof ralternating rcurrent ris rmutual r- rCorrect r
rAnswer r- rinductance
The ropposition roffered rby ra rcoil rto rthe rflow rof ralternating rcurrent ris rcalled r(disregard rresistance) r-
rCorrect r rAnswer r- rinductive rreactance
An rincrease rin rwhich rof rthe rfollowing rfactors rwill rcause ran rincrease rin rthe rinductive rreactance rof
ra rcircuit?
Inductance rand rfrequency
Resistance rand rvoltage
Resistance rand rcapacitive rreactance r- rCorrect r rAnswer r- rInductance rand rfrequency
Capacitors rare rsometimes rused rin rDC rcircuits rto r- rCorrect r rAnswer r- rsmooth rout rslight rpulsations
rin rcurrent/voltage
In ran rAC rcircuit, rthe reffective rvoltage ris r- rCorrect r rAnswer r- rless rthan rthe rmaximum rinstantaneous
rvoltage
,The ramount rof relectricity ra rcapacitor rcan rstore ris rdirectly rproportional rto rthe r- rCorrect r rAnswer r-
rplate rarea rand rinversely rproportional rto rthe rdistance rbetween rthe rplates
Convert rfarads rto rmicrofarads rby r- rCorrect r rAnswer r- rmultiplying rfarads rby r10 rto rthe rpower rof r6
Unless rotherwise rspecified, rany rvalues rgiven rfor rcurrent ror rvoltage rin ran rAC rcircuit rare rassumed
rto rbe r- rCorrect r rAnswer r- reffective rvalues
When rdifferent rrated rcapacitors rare rconnected rin rparallel rin ra rcircuit, rthe rtotal rcapacitance ris
r(NOTE: rCt=C1+C2...) r- rCorrect r rAnswer r- requal rto rthe rsum rof rall rthe rcapacitances
When rinductors rare rconnected rin rseries rin ra rcircuit, rthe rtotal rinductance ris r( rwhere rthe rmagnetic
rfields rof reach rinductor rdo rnot raffect rthe rothers) rNOTE: rLt=L1+L2... r- rCorrect r rAnswer r- requal rto
rthe rsum rof rthe rindividual rinductances
What ris rthe rtotal rcapacitance rof ra rcertain rcircuit rcontaining rthree rcapacitors rwith rcapacitances rof
r.25 rmicrofarads, r.03 rmicrofarads, rand r.12 rmicrofarads rrespectively? r- rCorrect r rAnswer r- r.4
rmicrofarads
Which rrequires rthe rmost relectrical rpower rduring roperation? r(NOTE r1 rHP=746 rwatts)
A r12 rvolt rmotor rrequiring r8 ramperes
4 r30 rwatt rlamps rin ra r12 rvolt rparallel rcircuit
2 rlights rrequiring r3 ramperes reach rin ra r24 rvolt rparallel rsystem r- rCorrect r rAnswer r- rTwo rlights
rrequiring r3 ramperes reach rin ra r24 rvolt rparallel rsystem
How rmuch rpower rmust ra r24 rvolt rgenerator rfurnish rto ra rsystem rwhich rcontains rthe rfollowing
rloads?
1 rmotor r1/5 rHP
3 rlights r20 rwatts rea
Heating relement r5 ramp
Anticollision rlight r3 ramp r- rCorrect r rAnswer r- r450 rwatts
A r12 rvolt relectric rmotor rhas r1,000 rwatts rinput rand r1 rHP routput. rMaintaining rthe rsame refficiency,
rhow rmuch rinput rpower rwill ra r24 rvolt, r1 rHP relectric rmotor rrequire? r- rCorrect r rAnswer r- r1,000
rwatts
How rmany ramperes rwill ra r28 rvolt rgenerator rbe rrequired rto rsupply rto ra rcircuit rcontaining r5 rlamps
rin rparallel, r3 rof rwhich rhave ra rresistance rof r6 rohms reach rand r2 rof rwhich rhave ra rresistance rof r5
rohms reach? r- rCorrect r rAnswer r- r25.23 ramperes
,A r1 rHP, r24 rvolt rDC relectric rmotor rthat ris r80 rpercent refficient rrequires r932.5 rwatts. rHow rmuch
rpower rwill ra r1 rHP, r12 rvolt rDC relectric rmotor rthat ris r75 rpercent refficient rrequire? r- rCorrect r
rAnswer r- r994.6 rwatts
The rpotential rdifference rbetween rtwo rconductors rwhich rare rinsulated rfrom reach rother ris
rmeasured rin r- rCorrect r rAnswer r- rvolts
Which reffect rdoes rnot rapply rto rthe rmovement rof relectrons rflowing rin ra rconductor? r- rCorrect r
rAnswer r- rThermal renergy
A r24 rvolt rsource ris rrequired rto rfurnish r48 rwatts rto ra rparallel rcircuit rconsisting rof r4 rresistors rof
requal rvalue. rWhat ris rthe rvoltage rdrop racross reach rresistor? r- rCorrect r rAnswer r- r24 rvolts
When rcalculating rpower rin ra rreactive ror rinductive rAC rcircuit, rthe rtrue rpower ris r- rCorrect r rAnswer
r- rless rthan rthe rapparent rpower
The rcorrect rway rto rconnect ra rtest rvoltmeter rin ra rcircuit ris r- rCorrect r rAnswer r- rin rparallel rwith ra
runit
What rwill ra rvoltmeter rread rif rproperly rconnected racross ra rclosed rswitch rin ra rcircuit rwith relectrical
rpower ron? r- rCorrect r rAnswer r- rZero rvoltage
Which rterm rmeans r.001 rampere? r- rCorrect r rAnswer r- rMilliampere
A rcabin rentry rlight rof r10 rwatts rand ra rdome rlight rof r20 rwatts rare rconnected rin rparallel rto ra r30
rvolt rsource. rIf rthe rvoltage racross rthe r10 rwatt rlight ris rmeasure, rit rwill rbe r- rCorrect r rAnswer r-
requal rto rthe rvoltage racross rthe r20 rwatt rlight
A r14 rohm rresistor ris rto rbe rinstalled rin ra rseries rcircuit rcarrying r.05 rampere. rHow rmuch rpower rwill
rthe rresistor rbe rrequired rto rdissipate? r- rCorrect r rAnswer r- rat rleast r35 rmilliwatts
.002 rKV requals r- rCorrect r rAnswer r- r2.0 rvolts
A r24 rvolt rsource ris rrequired rto rfurnish r48 rwatts rto ra rparallel rcircuit rconsisting rof r2 rresistors rof
requal rvalue. rWhat ris rthe rvalue rof reach rresistor? r- rCorrect r rAnswer r- r24 rohms
Which rrequires rthe rmost relectrical rpower?
A r1/5 rHP r24 rvolt rmotor rwhich ris r75 rpercent refficient
4 r30 rwatt rlamps rarranged rin ra r12 rvolt rparallel rcircuit
A r24 rvolt ranticollision rlight rcircuit rconsisting rof r2 rlight rassemblies rwhich rrequire r3 ramperes reach
rduring roperation r- rCorrect r rAnswer r- rA r1/5 rHP r24 rvolt rmotor rwhich ris r75 rpercent refficient
What runit ris rused rto rexpress relectrical rpower? r- rCorrect r rAnswer r- rWatt
What ris rthe rbasic runit rof relectrical rquantity? r- rCorrect r rAnswer r- rCoulomb
, What ris rthe roperating rresistance rof ra r30 rwatt rlight rbulb rdesigned rfor ra r28 rvolt rsystem? r- rCorrect r
rAnswer r- r26 rohms
Which rstatement ris rcorrect rwhen rmade rin rreference rto ra rparallel rcircuit?
The rcurrent ris requal rin rall rportions rof rthe rcircuit
The rtotal rcurrent ris requal rto rthe rsum rof rthe rcurrents rthrough rthe rindividual rbranches rof rthe
rcircuit
The rcurrent rin ramperes rcan rbe rfound rby rdividing rthe rEMF rin rvolts rby rthe rsum rof rthe rresistors rin
rohms r- rCorrect r rAnswer r- rThe rtotal rcurrent ris requal rto rthe rsum rof rthe rcurrents rthrough rthe
rindividual rbranches rof rthe rcircuit
Which rof rthe rfollowing rare rcommonly rused ras rrectifiers rin relectrical rcircuits?
Anodes
Cathodes
Diodes r- rCorrect r rAnswer r- rDiodes
Diodes rare rused rin relectrical rpower rsupply rcircuits rprimarily ras r- rCorrect r rAnswer r- rrectifiers
Transfer rof relectric renergy rfrom rone rcircuit rto ranother rwithout raid rof relectrical rconnections r-
rCorrect r rAnswer r- ris rcalled rinduction
If r3 rresistors r3 rohms, r5 rohms, rand r22 rohms rare rconnected rin rseries rin ra r28 rvolt rcircuit, rhow
rmuch rcurrent rwill rflow rthrough rthe r3 rohm rresistor? r- rCorrect r rAnswer r- r0.93 rampere
A rcircuit rhas ran rapplied rvoltage rof r30 rvolts rand ra rlad rconsisting rof ra r10 rohm rresistor rin rseries
rwith ra r20 rohm rresistor. rWhat ris rthe rvoltage rdrop racross rthe r10 rohm rresistor? r- rCorrect r rAnswer
r- r10 rvolts
In ra rparallel rcircuit rwith r4 r6 rohm rresistors racross ra r24 rvolt rbattery, rwhat ris rthe rtotal rvoltage
racross rresistor r3 rin rthe rcircuit? r- rCorrect r rAnswer r- r24 rvolts
Which ris rcorrect rin rreference rto relectrical rresistance?
2 relectrical rdevices rwill rhave rthe rsame rcombined rresistance rif rthey rare rconnected rin rseries ras
rthey rwill rhave rif rconnected rin rparallel
If r1 rof r3 rbulbs rin ra rparallel rcircuit ris rremoved, rthe rtotal rresistance rof rthe rcircuit rwill rbecome
rgreater
An relectrical rdevice rthat rhas ra rhigh rresistance rwill ruse rmore rpower rthan rone rwith ra rlow
rresistance rwith rthe rsame rapplied rvoltage r- rCorrect r rAnswer r- rIf r1 rof r3 rbulbs rin ra rparallel rcircuit
ris rremoved, rthe rtotal rresistance rof rthe rcircuit rwill rbecome rgreater
