全球旧事资料 分类
华南理工大学《电工学》考试真题4
华南理工大学期末考试A
1Co
siderthecircuitshow
i
Fig1give
thatUS16VUS210VR14ΩR22ΩR34ΩR41ΩR510ΩFi
dthevalueofI1I2I3I4I5a
dVAB6scores
S2
Fig1
2Co
siderthecircuitshow
i
Fig2thetwoidealdiodesareofthesametypevi6si
wtVpleasejudgethestateofD1a
dD2o
oroffa
dplotthewaveformofvoltagevO6scores
vi6si

Fig2
3Co
siderthecircuitshow
i
Fig3give
thatUS1VIS1AR1R2R31ΩDetermi
ecurre
tI1I2a
dvoltageUi
superpositio
whicheleme
tsaresupplyi
gpower8scores
US
Fig3
f4Fi
dtheTheve
i
equivale
tcircuitsforthetwotermi
alcircuitshow
i
Fig4give
thatR1R22kΩR304kΩ10scores
A
B
Fig4
5Co
siderthecircuitshow
i
Fig5give
IS9mAR16kΩR23kΩC2μFTheswitchShasbee
ope
foralo
gtimea
dthe
closedatt0pleasefi
dthe
utC
afterSisclosed10scores
2
Fig5
6Co
siderthesi
usoidalcircuitshow
i
Fig6give
thatR8ΩXL6ΩI1rmsI2rms02AFi
dthevalueofIrmsVrmsthepowerfactora
dreactivepowerofthetotalcircuit10scores
C
Fig6
f7Abala
cedpositiveseque
cewyethreephasesourcehasli
etoli
evoltagesof380Vrmsthissourceisco
ectedtoabala
cedwyeco
ectedloadi
Fig7EachphaseoftheloadisZ3j4Fi
dthei
sta
ta
eouscurre
tofiaAibBicCiN
theappare
tpoweraveragepowera
dthereactivepowerdeliveredtotheloadAssumethatthephaseofVabiszero10scores
Fig7
8Co
siderthecircuitshow
i
Fig8give
thatR1R2R310kΩRF20kΩuI11VuI22VuI31VFi
dthevalueofoutputvoltageuO10scores
uI2
uI
1u
F
R1
R2
R3
uI3
Fig8
9Tra
sistorsareoperati
gi
theactiveregio
i
Fig9assumethatβ50rπ1kΩdetermi
e1plotsmallsig
alequivale
tcircuit2calculatei
putresistorria
doutputresistorro3voltagegai
Au12scores
f
uo12V

vo
Fig9
10Co
siderthesourcefollowerillustratedi
Figure10determi
e1plotsmallsig
alequivale
tcircuit2Computethevoltagegai
i
putresista
cea
doutputresista
ce10scores
tvL
fig10
11Co
siderthecircuitshow
i
Fig11writethelogicformulaa
dmakesimplificatio
i
DeMorga
’slawa
alyzeitslogicfu
ctio
8scores
f1
I1I2
S1
12
URR1A2
I3I4S2
URR34
2A4I50A
5
VAB0V
6
2
1Whe
vi3VD1o
D2offvo3V
2Whe
vi3VD1offD2o
vo3V2Whe
3vi3VD1offD2offvovi
t
3
U
原图
US
好听全球资料 返回顶部