41. In a ballistic galvanometer 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

   In a ballistic galvanometer damping follows Logarithmic decay.

   Correct Option: B

   In a ballistic galvanometer damping follows Logarithmic decay.

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42. The instrument which should be used to measure 600 KV AC voltage is—
    

1. 1. Electrostatic voltmeter
      

   
   
   

   2. Moving coil voltmeter
      

   
   
   

   3. Moving iron voltmeter
      

   
   
   

   4. Hot wire instrument

   
   
   

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1. View Hint View Answer Discuss in Forum

   The instrument which should be used to measure 600 kV AC voltage is–Electrostatic voltmeter.

   Correct Option: A

   The instrument which should be used to measure 600 kV AC voltage is–Electrostatic voltmeter.

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43. The instrument which is not a current operated instrument is:
    

1. 1. Electrodynamometer type
      

   
   
   

   2. Electrostatic type
      

   
   
   

   3. Hot wire instrument
      

   
   
   

   4. Moving coil instrument

   
   
   

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1. View Hint View Answer Discuss in Forum

   Hot wire instrument is not a current operated instrument.

   Correct Option: C

   Hot wire instrument is not a current operated instrument.

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44. Which of the following instrument consumes the lowest power measurement?
    

1. 1. VTVM
      

   
   
   

   2. PMMC instrument
      

   
   
   

   3. Electrostatic instrument
      

   
   
   

   4. d′ Arsonval instrument

   
   
   

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1. View Hint View Answer Discuss in Forum

   Electrostatic instrument consumes lowest power among the given instrument.
   

   Correct Option: C

   Electrostatic instrument consumes lowest power among the given instrument.
   

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45. A DVM measures ………… value.
    

1. 1. average
      

   
   
   

   2. r.m.s.
      

   
   
   

   3. peak-to-peak
      

   
   
   

   4. peak

   
   
   

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1. View Hint View Answer Discuss in Forum

   A digital voltmeter (DVM) always measures average value.

   Correct Option: A

   A digital voltmeter (DVM) always measures average value.

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