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Oscillators – 1 – 3

11. Barkhausen criterion for oscillator stability is :

(a) Aβ = 0
(b) Aβ = 1
(c) –Aβ = 1
(d) A = 1/√β

ANSWER

EXPLANATION

12. A Hartley oscillator circuit uses :

(a) Capacitive feedback
(b) A tapped inductor
(c) A tapped capacitor
(d) A tapped inductor for inductive feedback

ANSWER

EXPLANATION

13. For good stability, the tuned circuit should have :

(a) High Q
(b) Low R
(c) Low L
(d) Low C

ANSWER

EXPLANATION

14. The varactor in a voltage controlled oscillator needs :

(a) Audio signal below 1000 Hz
(b) Reverse D.C control voltage
(c) Forward bias
(d) Parallel capacitance were than 5μF

ANSWER

EXPLANATION

15. In a practical oscillator is :

(a) Slightly less than 1
(b) 1
(c) -1
(d) Slightly greater than 1

ANSWER

EXPLANATION

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