For Roel

Page 1

1. (TCO 1) The signal is 5 sin (2 pi 2000 t + 60 degrees). The amplitude of this signal is (Points : 5)

       5 VPP
       3.535 VPP
       3.535 VRMS
       3.535 VPK

Question 2.2. (TCO 1) The signal is 10 sin (2 pi 1000 t + 30 degrees). The frequency of this signal is (Points : 5)

       2000 Hz
       1000 Hz
       6280 Hz
       10 kHz

Question 3.3. (TCO 1) The signal is 5 sin (2 pi 2000 t + 60 degrees). The phase shift of this signal is (Points : 5)

       +60 degrees
       -30 degrees
       +30 degrees
       -90 degrees

Question 4.4. (TCO 1) The signal is 5 sin (2 pi 2000 t + 60 degrees). The voltage displayed on the DMM is (Points : 5)

       5 VPP
       3.535 VPP
       3.535 VRMS
       3.535 VPK

Question 5.5. (TCO 1) Inductive reactance is the opposition that an inductor shows to _______. (Points : 5)

       alternating current
       direct current
       AC and DC
       none of the above

Question 6.6. (TCO 2) In an AC circuit with reactance XC in series with a resistor the circuit current (Points : 5)

       leads the applied voltage.
       lags the applied voltage.
       voltage and the current are in phase.
       No correct answer is listed

Question 7.7. (TCO 2) For the following series AC circuit, the angle of the circuit impedance is
(Points : 5)

       0 degrees
       +90 degrees
       +45 degrees
       -45 degrees

Question 8.8. (TCO 2) For the following series AC circuit, the phase angle of the circuit current is
(Points : 5)

       0 degrees
       +90 degrees
       -45 degrees
       +45 degrees

Question 9.9. (TCO 2) For the following series AC circuit, the total circuit impedance is:
(Points : 5)

       100 – j 100
       100 + j 100
       100 – j 200
       100 + j 300

Question 10.10. (TCO 3) For the parallel AC circuit shown below, find the circuit current IS . Note that Vin AC is mislabeled, it should be 10V, NOT 10 sin(ω t).
(Points : 5)

       0.1 + j 0.1 A
       0.1 – j 0.1 A
       0.1 A
       j 0.1 A

Question 11.11. (TCO 3) The total admittance for the following circuit is
Hint: YT = G + j (BC – BL) siemens; G = 1/R siemens; BC = C siemens and BL = 1/[ L ] Siemens
(Points : 5)

       0.01 – j 0.05 siemens
       0.01 + j 0.005 siemens
       0.01 – j 0.005 siemens
       0.001 – j 0.005 siemens

Page 2

Question 1.1. (TCO 4) Determine the resonance frequency of the following circuit to the nearest integer value.
(Points : 5)

       563 Hz
       1125 Hz
       281 Hz
       1000 Hz

Question 2.2. (TCO 4) We need to purchase an inductor coil for a resonance circuit resonating at 100 MHz; the operating bandwidth is 250 kHz. What is the quality factor Q of the coil? (Points : 5)

       100
       300
       400
       250

Question 3.3. (TCO 5) The superposition theorem is used (Points : 5)

       to calculate the short circuit current at the output of a circuit.
       to analyze any circuit with multiple sources using one at a time.
       for analyzing DC circuits only.
       for analyzing AC circuits only.

Question 4.4. (TCO 6) In an audio system we need to feed the audio signal to a tweeter (a high frequency speaker). This can be accomplished by using a ______. (Points : 5)

       band pass filter
       low pass filter
       high pass filter
       band stop filter

Question 5.5. (TCO 6) The cut off frequency is also known as the ______. (Points : 5)

       resonance frequency
       half power point
       full power point
       unity gain point

Question 6.6. (TCO 7) We need to bring down the voltage from 120 V to 12 V. The transformer turns ratio is _______. (Points : 5)

       1:10
       1:100
       10:1
       5:1

Question 7.7. (TCO 7) The role of a capacitor at the output of the bridge rectifier in an AC to DC converter is (Points : 5)

       to regulate the DC voltage.
       for smoothing the ripple.
       to eliminate the transformer.
       to double up the DC voltage.

Question 8.8. (TCO 1) What does the number “10” in the description of the sine wave 10sin(100 t) represent? (Points : 5)

Question 9.9. (TCO 2) How do you find the total reactance of multiple inductive reactances connected in parallel? (Points : 5)

Page 3

Question 1.1. (TCO 3) What is the phase angle of a capacitive susceptance? (Points : 5)

Question 2.2. (TCO 4) Can we calculate the inductor value given the circuit resonance frequency? If your answer is no, explain why. (Points : 5)

Question 3.3. (TCO 5) What is Kirchhoff’s voltage Law? (Points : 5)

Question 4.4. (TCO 6) What is the output side component in a simple RC low pass filter? (Points : 5)

Question 5.5. (TCO 7) Name an electronic product that you use every day that has a regulated DC power supply. (Points : 10)

Question 6.6. (TCO 8) What is the turns ratio for an isolation transformer? (Points : 10)

Page 4

Question 1.1. (TCOs 1,9) Describe the relationship between peak voltage, peak-to-peak voltage and rms voltage. Include in the discussion which values can be demonstrated with the laboratory test equipment. (Points : 35)

Question 2.2. (TCO 2) Describe the operation of the series RC circuit. The discussion must address phase angle relationships of current and voltage. The answer must include the effect of source frequency on the voltage drops across the resistor and the capacitor at very low and very high frequency values. (Points : 40)

Question 3.3. (TCOs 6,9) Describe the characteristics of the series RC filter circuit with the output across the resistive component. Distinguish the pass and stop bands with reference to the cutoff frequency. Also, state what happens to the circuit complex impedance at the cutoff frequency. (Points : 35)