Oscillators – Exercise – 1

11. Barkhausen criterion for oscillator stability is :

(a) Aβ = 0
(b) Aβ = 1
(c) –Aβ = 1
(d) A = 1/radic;beta;

Answer
Answer : (c)
Explanation
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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
Answer : (d)
Explanation
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13. For good stability, the tuned circuit should have :

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

Answer
Answer : (a)
Explanation
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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 5mu;F

Answer
Answer : (b)
Explanation
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15. In a practical oscillator Aβ is :

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

Answer
Answer : (d)
Explanation
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