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(ELEC102)test2_pastb.pdf
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(13)

1

magnitude Vm4V



Text Box: At bandwidth, V1 .l 0.7 x 2.8 Vrms
Text Box: bandwidth .l 10kHz
Text Box: (5)
Text Box: (4)
Text Box: (4)
Text Box: In the circuit, V1 versus log-frequency f is given as shown. Find roughly the magnitude of VS in V, bandwidth of D

(7)

2a


Text Box: (2)

Text Box: Find V phasor
Text Box: (2)
Text Box: Find frequency f of v(t)


Text Box: (3)
Text Box: Find period of v(t)


(31)

2b

170V

i(t) lags v(t) by 45o


Text Box: (7)

Text Box: (5)
Text Box: (3)


Text Box: Find impedance Z

Text Box: (3)
Text Box: (2)


Text Box: (5)



Text Box: 4..
Text Box: 6j..
Text Box: -2j..


(20)

3






Text Box: 1..

Text Box: (2)
Text Box: In the circuit, if , find V2(t) . The voltage controlled voltage source is in




(19)

4a

(2)

(4)

(2)

(5)

(2)

(4)

4b




Text Box: power absorbed by load A = P

Text Box: power stored by load A = Q

Text Box: power supplied by v(t) = S

Text Box: 4. Load A is connected to V(t) as shown.(a) Show that the power absorbed by load A is 400W. Find also the power st


(31)

4c

(9)

(6)

(4)

(6)

(6)

4d



Text Box: load B is capacitance







Text Box: power factor of load A = PF

(22)

(8)

(8)

(6)

7







Text Box: Use voltage divider


(28)

(7)

(3)

(2)

(6)

(8)

(2)

8b







Text Box: VO(t)



Text Box: 8a. Find VO of the 741 op amp. (10)?
Text Box: 8b. Plot VO(t). Assume ideal op amp. (18)

(30)

9b

voltage follower

(6)

(6)

9a




Text Box: Draw the circuit of an op amp voltage follower and name two advantages of the circuit. (12)

Text Box: 1. Very high input resistance2. Very low output resistance


(28)

10

(4)



Text Box: 10. Find VO and IS . Assume ideal op amp. (28)





(34)

11a



(34)

11b

(3)

(3)

(5)

(3)

(4)



Text Box: ?