56. Schering bridge is used to:
    

1. 1. Determine dielectric loss
      

   
   
   

   2. Determine the inductance
      

   
   
   

   3. Measure mutual inductance
      

   
   
   

   4. Measure low resistance

   
   
   

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1. View Hint View Answer Discuss in Forum

   Schering bridge is used to determine the dielectric loss.
   

   Correct Option: A

   Schering bridge is used to determine the dielectric loss.
   

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57. The price of capacitor will increase as:
    

1. 1. Voltage rating of the capacitor increases
      

   
   
   

   2. The size of the capacitor increases
      

   
   
   

   3. Microfarad rating of the capacitor increases
      

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   The price of capacitor will increase as voltage rating of the capacitor increases.

   Correct Option: A

   The price of capacitor will increase as voltage rating of the capacitor increases.

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58. Frequency compensation in a moving iron instrument is achieved by connecting a:
    

1. 1. High resistance in series with the coil
      

   
   
   

   2. Low resistance in series with the coil
      

   
   
   

   3. A capacitor in series with the fixed coil
      

   
   
   

   4. A capacitor across the fixed coil

   
   
   

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1. View Hint View Answer Discuss in Forum

   Frequency compensation in a moving iron instrument is achieved by connecting a capacitor across the fixed coil.

   Correct Option: D

   Frequency compensation in a moving iron instrument is achieved by connecting a capacitor across the fixed coil.

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59. A galvanometer can’t be used for the measurement of:
    

1. 1. Measuring current and voltage of small magnitude
      

   
   
   

   2. Determining the equality of two currents
      

   
   
   

   3. Measuring the quantity of electricity or current impulse
      

   
   
   

   4. Measuring the voltage impulse

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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60. In which of the following instruments the torque is proportional to the first derivative of inductance with respect to the angle?
    

1. 1. Moving coil instrument
      

   
   
   

   2. Electrodynamometer instrument
      

   
   
   

   3. Moving iron instrument
      

   
   
   

   4. Ferro dynamic instruments

   
   
   

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1. View Hint View Answer Discuss in Forum

   In moving iron instrument the torque is proportional to the first derivative of inductance with respect to the angle i.e.
   

   τ ∝	dθ
   	dt

   Correct Option: C

   In moving iron instrument the torque is proportional to the first derivative of inductance with respect to the angle i.e.
   

   τ ∝	dθ
   	dt

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