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The voltage that starts a feedback oscillator is caused by


A) the input signal from a generator.
B) thermal noise in resistors.
C) positive feedback.
D) ripple from the power supply.

E) B) and C)
F) All of the above

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One way to recognize a Hartley oscillator is by the


A) tapped inductors in the tank circuit.
B) transformer used for feedback.
C) three lead networks in the feedback path.
D) tapped capacitors in the tank circuit.

E) A) and D)
F) C) and D)

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In a Colpitts oscillator, which components) determine the feedback fraction, B?


A) The inductor in the tank circuit
B) The capacitors C1 and C2 in the tank circuit
C) The RF choke in the collector circuit
D) The resistors R1 and R2 in the base circuit

E) B) and D)
F) None of the above

Correct Answer

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A Wien- bridge oscillator uses


A) negative feedback.
B) positive feedback.
C) both types of feedback.
D) an LC tank circuit.

E) B) and C)
F) A) and B)

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The phase- shift oscillator usually has


A) two lead or lag circuits.
B) no feedback loop.
C) no RC sections.
D) three lead or lag circuits.

E) None of the above
F) A) and C)

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A stable type of oscillator is


A) the crystal oscillator.
B) the Hartley oscillator.
C) the Clapp oscillator.
D) None of the above.

E) B) and D)
F) B) and C)

Correct Answer

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Which type of LC oscillator uses a tickler coil in the feedback path?


A) Colpitts
B) Hartley
C) Clapp
D) Armstrong

E) A) and B)
F) A) and D)

Correct Answer

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