116. A voltage of 200 V produces a deflection of 90° in PMMC spring controlled instrument. If the same instruments provided with gravity control, what would be the deflection?

1. 1. 90°

   
   
   

   2. 45°

   
   
   

   3. 64.2°

   
   
   

   4. Cannot be known from the data given

   
   
   

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   NA

   Correct Option: B

   NA

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117. If an analog PMMC, 0 – 10 A ammeter is provided with no controlling mechanision and the moving parts are free to rotate, what will be the reading of the instrument if a current of 1 A (d.c.) passed through the moving coil (t or que produced is sufficient to overcome the frictional losses)?

1. 1. 1 A

   
   
   

   2. 10 A

   
   
   

   3. The pointer will continuously rotate

   
   
   

   4. The pointer will remain stationary

   
   
   

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   NA

   Correct Option: C

   NA

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118. 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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119. 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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120. 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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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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