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

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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4
Correct Answer :

1237.5 W-1262.5 W


Explanation :
No Explanation available for this question

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.  1000 mm              

2.            2000 mm                           

3.     500 mm                       

4.    None of these

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4
Correct Answer :

          2000 mm                           


Explanation :
No Explanation available for this question

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

1.  24 V – 36 V  

2.  29.4 V – 30.6 V

3.  20 V to 40 V

4.  None of these

View Answer  
4
Correct Answer :

24 V – 36 V

 


Explanation :
No Explanation available for this question

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%    

2.   2%                                                       

3.       4 %                     

4.      None of these

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4
Correct Answer :

     4 \%                     


Explanation :
No Explanation available for this question

A voltmeter has a resistance of 2000 . When it is connected across a d.c. circuit, its power consumption is 2 mW. The circuit condition remain undisturbed. If this voltmeter is replaced by a voltmeter of 4000 ? resistance, then power consumption will be

1.  4 mW                         

2.      1 mW                     

3.      2 mW                        

4.    None of these

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4
Correct Answer :

    1 mW                     


Explanation :
No Explanation available for this question

A miliammeter of resistance 100 is connected in series with a circuit. Its power consumption is 0.1 mW. Supposing it is replaced with a milliammeter of 200 ? resistance the power consumption will be

1.  0.2 mW                          

2.    0.05 mW                 

3.       0.1 mW                  

4.      none of these

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4
Correct Answer :

0.2 mW                          



Explanation :
No Explanation available for this question

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

1.  High friction loss  

2.  Low friction loss

3.  Nothing as regards friction loss

4.  None of these

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4
Correct Answer :

Low friction loss


Explanation :
No Explanation available for this question

A PMMC instrument produces a deflection of 900 when a current 2 mA passes through its moving coil. The instrument is spring controlled supposing the instrument is redesigned with its spring constant as before, and its permanent magnet is replaced with a new permanent magnet which would be the deflection if a current a 1 mA is passed through the coil The other features of the PMMC instrument remain the same.      

1.  1800                        

2.                900                                   

3.        450                             

4.      1350

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4
Correct Answer :

              900                                   


Explanation :
No Explanation available for this question

A 1mA ammeter has a resistance of 100 . It is to be converted to a 1 A ammeter. The value of shunt resistance is    

1.  0.01                   

2.     0.1001 ?                        

3.     100000 ?                             

4.    100 ?

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4
Correct Answer :

   0.1001 ?                        


Explanation :
No Explanation available for this question

A zero to 300 V voltmeter has guaranteed accuracy of %1 full scale reading. The voltage measured by the instrument is 83 V. The percent limiting error is

1.  0.95                        

2.       1.81                     

3.       3.62                                          

4.    4.85

View Answer  
4
Correct Answer :

     3.62                                          


Explanation :
No Explanation available for this question
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