106. The high torque to weight ratio in an analog indicating instrument indicates

1. 1. high friction loss

   
   
   

   2. low friction loss

   
   
   

   3. nothing as regards friction loss

   
   
   

   4. none of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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107. The power in a 3-phase, 3-wire load is measured using two 100W full-scale wattmeters W₁ and W₂. W₁ is of a accuracy class ± 1% and reads 100 W. W₂ is of accuracy class ± 0.5% and reads – 50 W. Then the uncertainty in the computation to total power is

1. 1. ± 1.5%

   
   
   

   2. ± 0.5%

   
   
   

   3. ± 4%

   
   
   

   4. ± 3%

   
   
   

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1. View Hint View Answer Discuss in Forum

   W₁ = 100W + 1W;
   W₂ = – 50 + 0.5W
   

   ∴ W1 + W2 =		50 ±	1.5		× 100 = ± 3%
   			50

   Correct Option: D

   W₁ = 100W + 1W;
   W₂ = – 50 + 0.5W
   

   ∴ W1 + W2 =		50 ±	1.5		× 100 = ± 3%
   			50

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108. An 0 – 10 A ammeter has guaranteed accuracy of 1 percent of full scale deflection. The limiting error while reading 2.5 is

1. 1. 1%

   
   
   

   2. 2%

   
   
   

   3. 4%

   
   
   

   4. none of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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109. 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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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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110. A d’Arsonval galvanometer uses a light and scale arrangement. The light source is placed 1 m away from the moving system of galvanometer. The arrangement uses a circular scale calibrated in mm. The deflection indicated by the scale is
     

1. 1. 1000 mm

   
   
   

   2. 2000 mm

   
   
   

   3. 500 mm

   
   
   

   4. none of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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