81. Calculate the resonant frequency of this Wien bridge oscillator if R1 = 25 kΩ, R2 = 40 kΩ, C1 = 0.001 μF, and C2 = 0.002 μF.
(a) 1560.3 Hz
(b) 1779.4 Hz
(c) 3120.7 Hz
(d) 3558.8 Hz
82. Which of the following oscillators is (are) tuned oscillators?
(a) Colpitts
(b) Hartley
(c) Crystal
(d) All of the above
83. This circuit is a ________ oscillator.
(a) phase-shift
(b) Wien bridge
(c) Colpitts
(d) Hartley
84. Nota
85. ________ is a frequency-determining component in a unijunction oscillator.
(a) Total resistance
(b) Total capacitance
(c) Intrinsic stand-off ratio
(d) All of the above
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