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True or False
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1
Direct FM circuits make use of techniques for varying the frequency of the carrier oscillator in accordance with the modulating signal.
A)True
B)False
2
Direct modulators produce FM via a phase shifter after the carrier oscillator stage.
A)True
B)False
3
A frequency modulator is a circuit that varies carrier frequency in accordance with the modulating signal.
A)True
B)False
4
Most varactors have nominal capacitance in the 1- to 200-μF range.
A)True
B)False
5
Phase-shift oscillators are generally used to set carrier frequency.
A)True
B)False
6
A frequency multiplier circuit is one whose output frequency is some sub-multiple of the input frequency.
A)True
B)False
7
Oscillators whose frequencies are controlled by an external input voltage are generally referred to as sawtooth oscillators.
A)True
B)False
8
The Schmitt trigger circuit is a level detector.
A)True
B)False
9
A reactance modulator produces a frequency deviation over a wide range and it is linear.
A)True
B)False
10
The reason for using PM instead of direct FM is that the carrier oscillator can be optimized for frequency accuracy and stability.
A)True
B)False
11
A reactance modulator circuit uses a transistor amplifier that acts as either a variable capacitor or an inductor.
A)True
B)False
12
Simple phase shifters produce a linear response over a large range of phase shift.
A)True
B)False
13
An advantage of phase-shift circuits is that they do not produce amplitude variations only phase changes..
A)True
B)False
14
The slope detector uses a tuned circuit and a diode detector to convert frequency variations to voltage variations.
A)True
B)False
15
A phase-locked loop is a frequency-sensitive feedback control circuit that can be used in frequency demodulation.
A)True
B)False





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