17 2-48. What class of biasing does the RC oscillator use? 1. A 2. B 3. C 4. AB 2-49. In an RC network, (a) what type of impedance is presented and (b) does the current lead or lag? 1. (a) Inductive (b) leads 2. (a) Inductive (b) lags 3. (a) Capacitive (b) lags 4. (a) Capacitive (b) leads 2-50. In the phase-shift oscillator, a phase shift of 180 degrees for regenerative feedback is provided by what minimum number of RC networks? 1. One 2. Two 3. Three 4. Four 2-51. What determines the phase angle of an RC network? 1. Input voltage 2. Output voltage 3. Values of resistance and inductance4. Values of resistance and capacitanceTHIS SPACE LEFT BLANK INTENTIONALLY.Figure 2D.—Phase-shift oscillator. IN ANSWERING QUESTIONS 2-52 THROUGH 2-56, REFER TO FIGURE 2D. 2-52. What is the maximum amount of phase shift provided by Q1 in the figure? 1. 0 degrees 2. 60 degrees 3. 90 degrees 4. 180 degrees 2-53. What type of feedback is provided through the RC networks to the base of Q1? 1. Neutral 2. Negative 3. Regenerative 4. Degenerative 2-54. At any other than the desired frequency, what type of feedback is provided by the circuit? 1. Neutral 2. Positive 3. Regenerative 4. Degenerative 2-55. What components make up the frequency-determining device? 1. C1, C2, CE, R1, R2, RB2. C2, C3, CE, R2, RB, RE3. C1, C2, C3, R1, R2, RB4. Cout, C1, C2, R1, R2, RE
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