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Unformatted text preview: TEST 2A BEL 3111C Fall 2009 Drs. Srivastava, Zmuda
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Last Name First Name Section # Answer all parts of all four (4) questions Show all work. Put your name on every page.
Two (2) hour time limit. Om {1) 3 by 5 Mdex cord allowed. Closed note, closed book. PROBLEM I. (5 points each). (a) The dependent source model of an op amp is characterized by three (3)
parameters. In the table below list their names, typical values and the
corresponding values in the ideal op amp model. 1 r Nth sue L. L,
(c) Suppose single (only once) switching occurs in a DC circuit with a capacitor.
Does the capacitor current always decrease in magnitude for t >0? :0... Su l‘wt 17L. 1}. 13 (d) Which quantity (voltage or current) must be continuous in an inductor and why? (Martcw, _
Lu“? ”1—9541? Quad0... PROBLEM 2 For the circuit shown assume that the opamp is ideal. a) (15 points) For what value of waill the output voltage v0 equal: v0 = 15—2121.” b) (5 points) For what range(s) of via will the opamp operate in the linear
region? IV.\<‘\ V 5; 3<VMI41L V b) ANSWER: PROBLEM 3 The voltage waveform in an energy—storage element is shown below: L'
.1.
—~r Initially (I = 0), 80 m1 of energy is stored in the element. (3) Assuming the element is a 16011111 inductor, ﬁnd the initial current i(O). ‘L
a» 4L . — I L= i  “L
(b) Determine the expression for the inductor current i(t) for 0 < t < 23. (10 points) no): ‘’—' My (2 %)o‘as.t]
’5, 500791» in ::I:w— :11: L L
=LXfEi1ti—t’%il W1 (c) Assuming the element is a capacitor, ﬁnd its capacitance. (5 points) PROBLEM 4 For the circuit shown the switch has been closed for a very long time and opens at t Answer: 11(0) = e 0n..— c) Find vL(t). (5 points) _Lé‘:..'_.L 68m
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Answer: vL(t) = "" GO 0 C V d) Find iy(t) for t > 0. (5 points) Answeriﬂt)= — L! e DISCLOSURE: I have not received any help during the time I took the test. Your signatures: x .............................................. Your Test Score ......................... b) Find 11(1) for t > 0. (15 points) %LL‘D) $41.1 u M ...
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 Fall '08
 SRIVASTAVA

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