15
2-35. The resonant frequency is tuned to the
desired value by what component?
1.
C1
2.
C2
3.
L3
4.
L1
2-36. What is the maximum degree of phase
shift provided between the base and
collector of Q1?
1. 0 degrees
2. 90 degrees
3. 120 degrees
4. 180 degrees
2-37. Temperature stability of the oscillator is
improved by what component?
1.
R1
2.
R2
3.
R3
4.
C4
2-38. What feature in a Hartley oscillator differs
from an Armstrong oscillator?
1. Tickler coil
2. Split inductor
3. Split coupling
4. Split capacitance
THIS SPACE LEFT BLANK
INTENTIONALLY.
Figure 2B.—Series-fed, tuned-base Hartley oscillator.
IN ANSWERING QUESTIONS 2-39
THROUGH 2-42, REFER TO FIGURE 2B.
2-39. What components are part of the
frequency-determining device of this
oscillator?
1. C1, L1, and L2
2. C2, L1, and L2
3. C3, L1, and L2
4. CE, RE, and RB
2-40. What circuit component prevents thermal
runaway?
1.
L1
2. CE
3. RB
4. RE
2-41. The low resistance of L2 could place a
short across the emitter-to-base junction
network of Q1 and RE. What component in
the circuit prevents this from happening?
1.
C1
2.
C2
3.
C3
4. CE
