36. An instrument has sensitivity of 1000 ohm/volt. On the 100 volt scale. This instrument will have internal resistance of:
    

1. 1. 10 ohms
      

   
   
   

   2. 10,000 ohms
      

   
   
   

   3. 1,00,000 ohms
      

   
   
   

   4. 1,000 ohms

   
   
   

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1. View Hint View Answer Discuss in Forum

   The sensitivity of voltmeter is given by relation Sensitivity,
   

   S =	1	ohms/volt
   	Ifsd

   
   where, I_fsd = full scale current
   S = R/V
   or
   R = SV
   = 1000 × 100 = 1,00,000 ohms

   Correct Option: C

   The sensitivity of voltmeter is given by relation Sensitivity,
   

   S =	1	ohms/volt
   	Ifsd

   
   where, I_fsd = full scale current
   S = R/V
   or
   R = SV
   = 1000 × 100 = 1,00,000 ohms

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37. To use miliammeter as voltmeter series resistance:
    where,
    V = Required voltage
    I_m = Full scale reading
    R_m = Meter resistance
    n = Multiplying factor of meter

1. 1. R_s = R_m (n – 1)
      

   
   
   

   2. R_s = V/I_m = R_m
      

   
   
   

   3. R_s = V/I_m + R_m
      

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   To use milliammeter as voltmeter series resistance.
   

   Rs =	V	- Rm
   	Im

   
   or
   

   Rs =		V	- 1		= Rm(n-1)
   		ImRm

   
   where,
   n = V/V_m
   = Voltage to be measured/Voltage of the meter
   where,
   V = Required voltage
   I_m = Full scale reading
   R_m = Meter resistance
   

   Correct Option: B

   To use milliammeter as voltmeter series resistance.
   

   Rs =	V	- Rm
   	Im

   
   or
   

   Rs =		V	- 1		= Rm(n-1)
   		ImRm

   
   where,
   n = V/V_m
   = Voltage to be measured/Voltage of the meter
   where,
   V = Required voltage
   I_m = Full scale reading
   R_m = Meter resistance
   

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38. The rectifier instrument is not free from the:
    

1. 1. Temperature error
      

   
   
   

   2. Waveshape error
      

   
   
   

   3. Frequency error
      

   
   
   

   4. All of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   The rectifier instrument is not free from the frequency error.
   

   Correct Option: C

   The rectifier instrument is not free from the frequency error.
   

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39. 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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40. 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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