16. Oscillators have :
(a) No feedback
(b) Negative feedback
(c) Positive feedback
(d) Either positive or negative feedback
17. Which of following oscillator will be preferried for generating for generating 1 MHz ?
(a) Colpilts oscillator
(b) Wein bridge oscillator
(c) Phase shift oscillator
(d) Any of the above
18. For oscillator to start, the loop gain Aβ of the oscillator must be :
(a) Infinitely high
(b) More than one
(c) Exactly one
(d) Less than one
19. Which of the following is an oscillator with best frequency stability ?
(a) Crystal oscillator
(b) Clapp oscillator
(c) Phase shift circuit
(d) Multi vibrator
20. What is the total phase shift requirement, around the feedback loop, for a phase-shift oscillator?
(a) 90°
(b) 180°
(c) 270°
(d) 360°
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