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.  24V - 36V

2.  29.4.V - 30.6.V

3.  20 V - 40 V

4.  none of these

View Answer  
4
Correct Answer :

24V - 36V


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

View Answer  
4
Correct Answer :

4\%


Explanation :
No Explanation available for this question

A voltmeter has a resistance of 2000Ω. 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 4000Ω resistance then power consumption will be

1.  4 mW

2.  1 mW

3.  2 mW

4.  none of these

View Answer  
4
Correct Answer :

1 mW


Explanation :
No Explanation available for this question

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

1.  0.2 mW

2.  0.05 mW

3.  0.1 mW

4.  none of these

View Answer  
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

View Answer  
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 reduces twice the flux density as before, what would be the, deflection if a current of 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

View Answer  
4
Correct Answer :

900


Explanation :
No Explanation available for this question

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

1.  0.001Ω

2.  0.1001Ω

3.  10000Ω

4.  100Ω

View Answer  
4
Correct Answer :

0.1001Ω


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 83V. 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

In order to reduce errors on account of temperature, instruments are 'Provided with shunts use series connected swamping resistance. In order that errors on account temperature changes be low, the swamping resistance

1.  should be made of a material giving a high resistance temperature co-efficient

2.  should be made of a material having a low resistance temperature co-efficient with the value of swamping resistance equal to meter resistance

3.  should be made of a material having low resistance temperature co-efficient and should have a value of about 20-30 times that of meter resistance

4.  should have an infinite value

View Answer  
4
Correct Answer :

should be made of a material having low resistance temperature co-efficient and should have a value of about 20-30 times that of meter resistance


Explanation :
No Explanation available for this question

A 4-range milliammeter having ranges of 0 - 10 mA, 0 - 50 mA, 0 - 100mA and 0 - 500 mA. It is used for measurement of current whose magnitude is not known. In order to prevent' damage to the instrument the selector switch of the ammeter should be first placed at

1.  0 - 50 mA range

2.  0 - 100 mA range

3.  0 - 10 mA range

4.  0 - 500 mA range

View Answer  
4
Correct Answer :

0 - 500 mA range


Explanation :
No Explanation available for this question
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