216. For a wien range of oscillations in the audio range the preferred oscillator is:

1. 1. Hartley

   
   
   

   2. Phase-shift

   
   
   

   3. Wien bridge

   
   
   

   4. Hartley and Colpitt

   
   
   

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   NA

   Correct Option: C

   NA

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217. The phase shift oscillator:

1. 1. using OP amplifier is a voltage series feedback

   
   
   

   2. using transistor is a voltage series feedback

   
   
   

   3. using FET is a voltage shunt feedback

   
   
   

   4. using OP amplifier is a voltage shunt feedback

   
   
   

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   NA

   Correct Option: A

   NA

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218. In the RC phase-shift oscillator:

1. 1. the β network introduces a phase change of 180º

   
   
   

   2. the β network introduces a phase of 360º

   
   
   

   3. the amplifier gain has to be a positive number

   
   
   

   4. A β should be –1

   
   
   

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   NA

   Correct Option: A

   NA

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219. The Barkhausen criterion gives:

1. 1. the condition for stability

   
   
   

   2. the maximum gain for which there are no oscillations

   
   
   

   3. the phase-shift required for oscillation

   
   
   

   4. the maximum feedback for a stable amplifier

   
   
   

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   NA

   Correct Option: C

   NA

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220. The oscillator shown below is a:
     
     
     

1. 1. Colpitts oscillator

   
   
   

   2. Hartley oscillator

   
   
   

   3. Tuned emitter oscillator

   
   
   

   4. Clapp oscillator

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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