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Hartley Oscillator
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 1) In a transistor Hartley oscillator Entire coil is in the output circuit Resistive feedback is used Capacitive feedback is used Inductive feedback is used

 2) The feedback signal in which of the following oscillator is derived from an inductive voltage divider in the LC circuit Phase shift Oscillator Weins bridge oscillator Hartley Oscillator Colpitts Oscillator

 3) One condition for positive feedback is that the phase shift around the feedback loop must be 45 180 90 0

 4) What type of sine-wave oscillator uses a tapped inductor to provide the positive feedback required for oscillation? Pierce Oscillator Colpitts Oscillator Clap Oscillator Hartley Oscillator

 5) What type of capacitor is usually used in the tuned circuits of oscillators? Electrolytic Low loss Surface mount High voltage

 6) For sustaining oscillations in an oscillator Phase shift should be negative and phase shift should be 0 or π/2 Feedback factor should be unity and phase shift should be 0 or nπ Phase shift should be unity and phase shift should be 0 or π/2 Feedback factor should be negative and phase shift should be 0 or nπ

 7) Choose the right answer for Barkhausen criteria βA=+1 βA=0 βA=-1 β=A

 8) Which of the following factors do not affect the frequency stability of an oscillator? Inter-element capacitances and stray capacitances Output load Coil size Temperature variation

 9) In Hartley oscillator, the expression for frequency of oscillation is given by f=1/(2π√LC)with C=C1C2/(C1+C2) f=1/(2π√LC)with L=L1+L2 f=1/(2π√R1R2C1C2) f=1/(2πRC√6)

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