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Unformatted text preview: FinaIEIantA  EL 3111:: '  Spring sou nestnausea
Sﬁliﬂﬁiﬂh’ﬂ . . . . n . _ _ _ _ .___. ..... ...'. __________ _. ' Last Name I " First Name ' Section ii Note: You must write your name and section #. Incorrect section at or blank in
the section'space will lead to a 5 point pity. No exceptions. There are ﬁve problems in this test spread over ﬁtnr sheets. Including the cover page,
there are seven typewritten pages. The last page is left blank for your use, if you need it. ' Read each question carehllly before attempting to write answer and please try to answer
each question in the space provided. There is suﬁcient'spaee for each'pert‘s answer.—
ShootIr all the steps leading to the solution. What may be obvious to you onto your
calculator may not he that obvious to the reader. Showing steps helps secure a partial
grade if the procedure is correct. '  ' . _ Hyou do not wish any material to he graded, you must cross it out. If you leave
unwanted material written on the test, it will he considered part of the answer and.
_ graded. You will be'penalized for not deleting it in case it is erroneous. ' ' There are penalties for not writing units. Each time when unit is omitted or mitten: _ 
incorrectly, one point will he taken off. No exceptions; Be oareﬁsl. ' ' Your score in this test will appear at the end of the last problem. 'm. 1 I
Answer each part in the space provided. 4; _[a] In the circuit shown, R1, is variable. “.113 ' '. R , What are the maximum and minimum values of 15?  'RL‘T—D :,_ I5 r2. _\i3 C WE} . Rt . . '
RL “1.700) 31:5 '1 Icmim‘l I I 1 Pl At What time is the induetor voltage at its maxinutm. Cd— JC'LU: 4 ' (d) An induetor is connected in series with a resistor. Show the phasor diagram
for the We voltages. '
 Hint: Assume a sinusoid for current and ﬁnd the voltage sinusoids. L
. + 'u' R — 4 (e) A11 appliance is rated for 22!] "ii, 6] Hz, 15 A. It is used two hours eaoh day.
Can you estimate the monthly,r energyr consumption ﬂow the above data? Explain. Na, __ WL.._%F——E=?L Pym g Prob. 2 Consider the DC circuit shom 5 (a) Giveﬁ 10 = 4 A, using only KCL, KVL, and ohm’s law, ﬁnd 11. :1: S~1ﬂ£§EQ: H31 30+ 1371:" “S'ZFB—lvZw'I—‘:—O
191‘: Hap+.§CL17'*10'CI) "It ‘2— #143! ‘g‘ {:93 (h) Suppose In is not given. Use Thevenin’s theorem to ﬁnal].
ETA Cg TYBNE' diwﬂafﬁér
I . I In EJ'ZLQ'I' . , an
5251— 1‘25?) 5" _ _ _ (o) Hot».r much poorer is absorbed in tho ounont source? "'L \J 2;  _‘£$'Cl")* 6TH) :1 '* 5’03; on 5? (ST) E.
P: am“) Prob. 3 The. following circuit was in a DC Steady state at t = IT and tho switch movos from
position (a) to (b) at t = D. 5 5 _ 5 5 {b} Whatismeindunmrcurreiﬁlnng ﬁnd: aﬁerﬁmmﬁtolﬁng occurs? :T—ad' ~ 
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Car1'} 7. (c) Dateﬁim: the time mnstant 1: after the switching. Rm "1 1'5 "‘r (gigEH2”) ' I LHJJL L.__ E QGW H _
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(f) Is vﬁt} continuous at t = ﬂ? Ju'stify your answer. Egg") I“; 16’0er
I \LR (0+3 =
Wharf— r I séy Prob. 4 ID {5.) Find Ithe equivalent impedance seen by the source. Give your answer in the
rectangular form. '  ' ' Kai [ﬂier ﬁle; in I 9'” “i ("WW Cliff?) ' 1" me; \1 C150”) .
' {w =. Ea.“‘VJ"‘*’) “(L Jm+qﬂgi+ch 5 (b) Find the phasor Is in polar form; —. E :_ 2:940?‘
wow 15 :'.:I Log—+— 4’63qu P:
5 {c} How much oompiex power is provided by the source?
. “ﬁrt "“=ﬁ 1' @325 \m
3 ﬁgs is; 3%? “04 _
’ ' r ﬂow—=1er 3‘51.(13)V.15I . g {$.01 +31%:ng ' 5A 5 {d}FindthephasurI1. _
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a. '1. 1 1L?
11 d in: if H 11910 P? @9ch Lahsc’ﬁ 5 [e] Detamﬁne the average pqwer in rasistor R1.
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This note was uploaded on 07/10/2011 for the course EEL 3113c taught by Professor Staff during the Spring '11 term at University of Florida.
 Spring '11
 Staff

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