41. A 0 – 300 V voltmeter has an error of ± 2% of full scale deflection. If true voltage is 30 V, the range of readings will be

1. 1. 24 V – 36 V

   
   
   

   2. 29.4 V – 30.6 V

   
   
   

   3. 20 V to 40 V

   
   
   

   4. none of these

   
   
   

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   NA

   Correct Option: A

   NA

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42. A spring producers a controlling torque of 16 × 10^–6 Nm for a deflection of 120°. Suppose its width and length are made two times their original value and the thickness is halved, then value of controlling torque for the same deflection will be
    

1. 1. 16 × 10^–6 Nm

   
   
   

   2. 8 × 10^–6 Nm

   
   
   

   3. 32 × 10^–6 Nm

   
   
   

   4. 2 × 10^–6 Nm

   
   
   

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   NA

   Correct Option: D

   NA

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43. The maximum current that can be drawn from a saturated Weston cell without damaging it, is

1. 1. 100 mA momentarily

   
   
   

   2. 100 µA continuously

   
   
   

   3. 100 µA momentarily

   
   
   

   4. 1 mA momentarily

   
   
   

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   NA

   Correct Option: C

   NA

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44. The internal resistance of a saturated Weston cell is of the order of a

1. 1. few ohm

   
   
   

   2. few kilo ohm

   
   
   

   3. few hundreds of ohm

   
   
   

   4. fraction of ohm

   
   
   

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   NA

   Correct Option: C

   NA

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45. The decrease in the value of emf of an unsaturated Weston cell is about

1. 1. 1 µV per year

   
   
   

   2. 1 mV per year

   
   
   

   3. 5 – 10 µV per year

   
   
   

   4. 30 – 50 µV per year

   
   
   

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   NA

   Correct Option: B

   NA

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