116. 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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117. 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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118. 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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119. Hot-wire or Pirani gauge meter is used for the measurement of:
     

1. 1. Temperature, radiant heat
      

   
   
   

   2. Relative humidity
      

   
   
   

   3. Liquid level thickness
      

   
   
   

   4. Gas flow, gas pressure

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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120. Eelctrostatic instruments are not free from effect of:
     

1. 1. Temperature
      

   
   
   

   2. Frequency
      

   
   
   

   3. Stray magnetic field
      

   
   
   

   4. Stray electrostatic field

   
   
   

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1. View Hint View Answer Discuss in Forum

   Electrostatic instruments are not free from stray electrostatic field effect.
   

   Correct Option: D

   Electrostatic instruments are not free from stray electrostatic field effect.
   

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