96. The size of potential transformers is

1. 1. the same as that of power trans- formers of the same VA rating

   
   
   

   2. much greater than that of power transformers of the same VA rating because they are designed for low ratio and phase angle errors which require large sized cores and winding conductors

   
   
   

   3. smaller than that of power transformers of the same VA rating

   
   
   

   4. none of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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97. Capacitive potential transformers are used

1. 1. for primary winding phase voltages above 100 kV

   
   
   

   2. for keeping the value of transformation ratio constant irrespective of the burden by making certain adjustment

   
   
   

   3. because they are cheaper than the electromagnetic trans-formers above a certain voltage range

   
   
   

   4. all of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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98. The ratio and phase angle errors in potential transformers may be reduced by

1. 1. increasing the exciting current

   
   
   

   2. increasing the resistance and leak age reactance in the transformer

   
   
   

   3. by not employing turns compensation

   
   
   

   4. none of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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99. Turns compensation is used in current transformers primarily for reduction of
    

1. 1. phase angle error

   
   
   

   2. both ratio and phase angle errors

   
   
   

   3. ratio error reduction in phase error is incidental

   
   
   

   4. none of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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100. The errors in current transformers can be reduced by designing them with
     

1. 1. high permeability and low loss core materials, avoiding any joints in the core and also keeping the flux density to a low value

   
   
   

   2. using primary and secondary windings as close to each other as possible

   
   
   

   3. using large cross-sections for both primary and secondary winding conductors

   
   
   

   4. all of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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