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

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

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

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

 6) For sustaining oscillations in an oscillator Feedback factor should be negative and phase shift should be 0 or nπ 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

 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 Coil size Temperature variation Output load

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

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