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19.   What is the resonant frequency of a series-tuned LC circuit that contains a 2 mH...

19.   What is the resonant frequency of a series-tuned LC circuit that contains a 2 mH inductor and a 30 μF capacitor? (Round your answer to the nearest Hz.)

    
  A. 278 Hz
  B. 550 Hz
  C. 420 Hz
  D. 650 Hz

21.   How is the proper phase shift produced in a phase-shift oscillator?

    
  A. Through a transistor
  B. Through RC combinations
  C. Through an inductor
  D. Through RL combinations

22.   An RC phase-shift oscillator has a load resistance of 15 kΩ. Each resistor in the feedback network has a value of 15 kΩ, and each capacitor has a value of 0.02 μF. What is the frequency of oscillation in this circuit?

    
  A. 167,000 Hz
  B. 16,700 Hz
  C. 1,670 Hz
  D. 167 Hz

24.   Circulating current in a tuned LC circuit will gradually die out due to losses in the circuit, and the oscillation will eventually stop unless the power is replaced. This occurrence is called the

    
  A. sawtooth effect.
  B. damping effect.
  C. regenerative effect.
  D. constant-amplitude effect.

25.   A highly accurate output frequency can be obtained with a(n)

    
  A. crystal-controlled oscillator.
  B. Colpitts oscillator.
  C. Armstrong oscillator.
  D. Hartley oscillator.

0.   One way of thinking of an amplifier is to consider its action to be that of a signal-controlled variable

    
  A. transformer.
  B. capacitor.
  C. inductor.
  D. resistor.

Amplitude control in a practical Wien bridge oscillator can be provided by a/an

    
  A. inductor.
  B. thermistor.
  C. capacitor.
  D. diode.
0 0
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