This set of Analog Electronic Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Colpitts Oscillator-2″.

1. Colpitts oscillator uses which type of feedback ________

a) Negative feedback

b) Positive feedback

c) No feedback

d) Positive or Negative depends upon frequency

2. To ensure constant feedback which method is used in Colpitts oscillator ________

a) Gang tuning

b) Using same capacitor

c) No method is used

d) Voltage divider always gives constant feedback

3. The frequency of Colpitts oscillator is expressed as __________

(Where L is inductance and C is the effective capacitance)

a) 1/(4ᴨ√LC)

b) 1/(2ᴨ√LC)

c) 1/(3ᴨ√LC)

d) √3/(2ᴨ√LC

4. If C1 and C2 are the capacitance used in Colpitts oscillator the effective capacitance in the equation of frequency calculation is equal to ___________

a) (ᴨ×C1×C2)/(C1+C2)

b) 3 (C1×C2)/(C1+C2)

c) (C1×C2)/(2ᴨ(C1+C2))

d) (C1×C2)/(C1+C2)

5. Phase shift provided by overall tank circuit is ___________

a) 0 degree

b) 90 degree

c) 180 degree

d) -90 degree

6. Which of the following equation gives amplitude of oscillation in Colpitts oscillator using the describing function method? (Where Ic is the is the bias current RL is the load resistor and C1 & C2 are the upper and lower capacitance of voltage divider bias)

a) 2I_{C}R_{L}/C1+C2

b) 2I_{C}C2/C1+C2

c) 2I_{C}R_{L} C2/C1

d) 2I_{C}R_{L} C2/C1+C2

7. Which configuration of transistor amplifier is used for Colpitts oscillator?

a) Common emitter amplifier

b) Common collector amplifier

c) Common base amplifier

d) Combination of both common emitter and common collector

8. The gain device in the colpitts oscillator act as a ___________

a) Low pass filter

b) High pass filter

c) Band pass filter

d) Band rejection filter

9. The improvement of Colpitts oscillator over Hately oscillator is, Colpitts oscillator’s performance in ___________

a) All frequency region

b) Mid frequency region

c) High frequency region

d) Low frequency region

10. Colpitts oscillator provides more performance than Hartley oscillator because of its ________ elements.

a) Capacitive

b) Resistive

c) Inductive

d) Active