a. CCE of Q1.
c.
T1.
b. CCE of Q2.
d.
C1.
15. Modulation of the Colpitts oscillator shown in figure 2-5 is attained by
varying the reactance of components labeled
a. CR2 and CR3.
c.
C7 and C4.
b. CR2 and T1.
d.
C2 and C3.
16. Some FM transmitters incorporate a limiter stage prior to the multiplier
stages. The purpose of this limiter stage is to remove the
a. phase variations from the signal.
b. sideband frequencies from the signal.
c. frequency variations from the signal.
d. amplitude variations from the signal.
17. In the modulator assembly shown in figure 2-5, capacitors C2 and C3 serve a
dual purpose--they operate as part of the oscillator tuned circuit and they also
a. develop the oscillator emitter-to-base bias.
b. couple the regenerative feedback to the emitter circuit.
c. emphasize the high frequencies in the modulating signal.
d. match the oscillator impedance to that of the following stage.
18. In the Miller-effect modulator shown in figure 2-4, frequency modulation of
the oscillator is produced by injecting the reactive changes from Q1 into the tuned
circuit of Q2. The frequency deviation that is produced in Q2 is controlled by the
a. reactance of L1.
b. capacitance of C2.
c. input capacitance of Q1.
d. feedback voltage to the tapped capacitors.
19. All oscillators require that a portion of the output be fed back to the input
to sustain oscillations.
The component used to provide this feedback in the FM
oscillator shown in figure 2-5 is labeled
a. C4.
c.
T1.
b. C7.
d.
CR4.
18
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