# 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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4

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 ?

4

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

4