31. The deflection of hot wire instrument depends on:
    

1. 1. RMS value of alternating current
      

   
   
   

   2. voltage
      

   
   
   

   3. average value of a.c. current
      

   
   
   

   4. instantaneous value of a.c. current

   
   
   

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1. View Hint View Answer Discuss in Forum

   The Deflection of hot wire instrument depends on RMS value of alternating current.

   Correct Option: A

   The Deflection of hot wire instrument depends on RMS value of alternating current.

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32. Which one out of the following instruments should be used to measure 600 kV a.c. voltage?
    

1. 1. Hot wire instrument
      

   
   
   

   2. Electrostatic voltmer
      

   
   
   

   3. Moving coil voltmer
      

   
   
   

   4. Moving iron voltmeter

   
   
   

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1. View Hint View Answer Discuss in Forum

   Electrostatic voltmeter instrument should be used to measure 600 KV a.c. voltage.

   Correct Option: B

   Electrostatic voltmeter instrument should be used to measure 600 KV a.c. voltage.

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33. A CRO uses:
    

1. 1. Electromagnetic focussing
      

   
   
   

   2. Electrostatic focussing
      

   
   
   

   3. Both focussing techniques
      

   
   
   

   4. No focussing technique

   
   
   

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1. View Hint View Answer Discuss in Forum

   A CRO uses electrostatic focussing.

   Correct Option: B

   A CRO uses electrostatic focussing.

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34. An average response rectifier type electronic ac voltmeter has a dc voltage of 10 V applied to it. The meter reading will be:
    

1. 1. 7·1 V
      

   
   
   

   2. 10·0 V
      

   
   
   

   3. 11·1 V
      

   
   
   

   4. 22·2 V

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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35. A moving coil galvanometer is made into a d.c. ammeter by conecting:
    

1. 1. a low resistance across the meter
      

   
   
   

   2. a high resistance in series with the meter
      

   
   
   

   3. a pure inductance across the meter
      

   
   
   

   4. a capacitor in series with the meter

   
   
   

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1. View Hint View Answer Discuss in Forum

   A moving coil galvanometer is made into a d.c. ammeter by connecting a low resistance across the meter.

   Correct Option: A

   A moving coil galvanometer is made into a d.c. ammeter by connecting a low resistance across the meter.

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