226. Which of the following is a stable sine-wave audiogenerator?

1. 1. Wien-bridge oscillator

   
   
   

   2. Armstrong oscillator

   
   
   

   3. Hartley oscillator

   
   
   

   4. None of the above.

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

227. The oscillator shown in Fig. is a:
     
     
     

1. 1. Clapp oscillator

   
   
   

   2. RC phase shift oscillator

   
   
   

   3. Hartley oscillator

   
   
   

   4. Colpits oscillator

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

---

228. In a practical oscillator, the magnitude of loop gain AB is kept slightly larger than unity and the amplitude of oscillations is limited by:

1. 1. the ratio of A to B

   
   
   

   2. the on set of non-linearity of amplifying device

   
   
   

   3. the linearity of amplifying device

   
   
   

   4. all of the above.

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

229. The feedback path in an op-amp differentiator consists of:

1. 1. a resistor

   
   
   

   2. a capacitor

   
   
   

   3. a resistor and a capacitor in series

   
   
   

   4. a resistor and a capacitor in parallel.

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

---

230. The op-amp comparator circuit uses:

1. 1. positive feedback

   
   
   

   2. negative feedback

   
   
   

   3. no feedback.

   
   
   

   4. any feedback.

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---