16
2-42. When a positive signal is coupled to the
base of Q1, what happens to (a) collector
current and (b) emitter current?
1. (a) Increases (b) increases
2. (a) Increases (b) decreases
3. (a) Decreases (b) decreases
4. (a) Decreases (b) increases
2-43. A tuned-base Hartley oscillator is
described as "shunt fed" when
1. ac flows through the tank circuit
2. dc flows through the tank circuit
3. ac does not flow through the tank
circuit
4. dc does not flow through the tank
circuit
2-44. Which of the following advantages does
the Colpitts oscillator have over the
Armstrong and Hartley oscillators?
1. Easier to tune
2. Wider frequency range
3. Better frequency stability
4. All of the above
THIS SPACE LEFT BLANK
INTENTIONALLY.
Figure 2C.—Oscillator.
IN ANSWERING QUESTIONS 2-45
THROUGH 2-47, REFER TO FIGURE 2C.
2-45. What type of oscillator is shown in the
figure?
1. Common-base Hartley
2. Common-base Colpitts
3. Common-emitter Colpitts
4. Common-collector Hartley
2-46. What component is the collector load
resistor?
1.
R1
2.
R2
3.
R3
4.
R4
2-47. What resistors provide the base bias?
1. R1, R2
2. R2, R3
3. R3, R4
4. R2, R4
