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2-65. How is the Q of a crystal determined?
1. Type of cut used
2. Type of holder used
3. Accuracy of the grinding
4. All of the above
2-66. An oscillator that is turned ON for a
specific period of time, then is turned OFF
and remains OFF until required at a later
time, is which of following types?
1. LC
2. Pierce
3. Pulsed
4. Crystal
Figure 2F.—Oscillator circuit.
IN ANSWERING QUESTIONS 2-67
THROUGH 2-70, REFER TO FIGURE 2F.
2-67. What circuit is shown in the figure?
1. Pierce oscillator
2. Pulsed oscillator
3. Colpitts oscillator
4. Armstrong oscillator
2-68. Sine waves are generated in the emitter
circuit of Q1 during which of the
following time periods of the input gate?
1. T0 to T1 and T1 to T2
2. T0 to T1 and T2 to T3
3. T1 to T2 and T3 to T4
4. T1 to T3 and T0 to T4
2-69. The frequencies in the output are
determined by what two circuit
parameters?
1. Input gate time and the time the circuit
is turned OFF
2. Output gate time and the time the
circuit is turned ON
3. Input gate time and the resonant
frequency of the tank circuit
4. Output gate time and the resonant
frequency of the tank circuit,
2-70. If the resonant frequency of the tank
circuit were 5 megahertz and transistor Q1
were cut off for 500 microseconds, what
maximum number of cycles of the tank
frequency would be present in each pulse
of the output?
1.
500 cycles
2. 1,500 cycles
3. 2,500 cycles
4. 3,500 cycles
2-71. What is the fourth harmonic of a
2-megahertz signal?
1. 6 megahertz
2. 2 megahertz
3. 8 megahertz
4. 4 megahertz
2-72. What is the highest multiplication factor
normally used in frequency multipliers?
1. One
2. Two
3. Three
4. Four
