41. To ascertain any particular harmonics in an e.m.f. waveform:
    

1. 1. Resonance effect can be used
      

   
   
   

   2. Hall effect can be used
      

   
   
   

   3. Both (a) and (b)
      

   
   
   

   4. None of the above

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

42. The ratio arm is used in bridge method of measurement basically:
    

1. 1. To speed up the response time for balancing
      

   
   
   

   2. To reduce the error due to the errors in known resistances
      

   
   
   

   3. To simplify the calculations
      

   
   
   

   4. To enhance the range of measurement

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

---