111. A wattmeter has a full scale range of 2500 W. It has an error ± 1% of true value. If true power is 1250 W, range of reading will be

1. 1. 1225 W – 1275 W

   
   
   

   2. 1245 W – 1255 W

   
   
   

   3. 1200 W – 1300 W

   
   
   

   4. 1237.5 W – 1262.5 W

   
   
   

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   NA

   Correct Option: D

   NA

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112. Power in a d.c. circuit is measured by measuring the voltage across and current through the circuit. The voltage and current measurement are made to an accuracy of ± 2% and ± 3% respectively. The errors are limiting errors. The error in measurement of power is

1. 1. ± 2%

   
   
   

   2. ± 3%

   
   
   

   3. ± 6%

   
   
   

   4. ± 5%

   
   
   

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   NA

   Correct Option: D

   NA

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113. Fluid friction damping can be used in
     

1. 1. horizontally mounted instru-ment

   
   
   

   2. vertically mounted instrument

   
   
   

   3. both in horizontally and vertically mounted instrument

   
   
   

   4. none of these

   
   
   

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   NA

   Correct Option: B

   NA

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114. Air friction damping should not be used where the deflecting torque in the instrument is produced due to

1. 1. magnetic field

   
   
   

   2. electrostatic field

   
   
   

   3. thermo-electric emf

   
   
   

   4. none of these

   
   
   

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   NA

   Correct Option: D

   NA

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115. 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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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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