26. If the current sensitivity of a galvanometer is increased, the voltage sensitivity:
    

1. 1. Decreases
      

   
   
   

   2. Also increases
      

   
   
   

   3. May increase or decrease
      

   
   
   

   4. Remains unaltered

   
   
   

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1. View Hint View Answer Discuss in Forum

   If the current sensitivity of a galvanometer is increased, the voltage sensitivity decreases.
   

   Correct Option: A

   If the current sensitivity of a galvanometer is increased, the voltage sensitivity decreases.
   

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27. In the two-wattmeter method of measuring power in a balanced three-phase circuit, one wattmeter shows zero and the other positive maximum. The load power factor is:
    

1. 1. zero
      

   
   
   

   2. 0·5
      

   
   
   

   3. 0·866
      

   
   
   

   4. 1·0

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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28. The minimum number of of wattmeter(s) required to measure 3-phase, 3-wire balanced or unbalanced power is:
    

1. 1. 1
      

   
   
   

   2. 2
      

   
   
   

   3. 3
      

   
   
   

   4. 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   Two single phase wattmeter wattmeters are used for measuring 3 wire 3-phase system.

   Correct Option: B

   Two single phase wattmeter wattmeters are used for measuring 3 wire 3-phase system.

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29. In a ballistic galvanometer, the damping follows:
    

1. 1. Hyperbolic decay
      

   
   
   

   2. Logarithmic decay
      

   
   
   

   3. Exponential decay
      

   
   
   

   4. Exponential rise

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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30. A DVM has a 4^1/2 digit display. The 1 volt range can read upto:
    

1. 1. 9999
      

   
   
   

   2. 9·99
      

   
   
   

   3. 1·9999
      

   
   
   

   4. 0·19999

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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