The sensitivity of an instrument is the

1.  Smallest increment in the input that can be detected with certainty

2.  Largest input change to which the instrument fails to respond

3.  Ratio of  the change in the magnitude of the output to the  corresponding change in the magnitude of the input  

4.  Closeness of the output values for repe3ated applications of a constant input 

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4
Correct Answer :

Ratio of  the change in the magnitude of the output to the  corresponding change in the magnitude of the input

 


Explanation :
No Explanation available for this question

The internal resistance of a Weston standard cell is of the order of    

1.  1 ohm                    

2.        10 ohm                      

3.   100 ohm                          

4.   1000 ohm

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4
Correct Answer :

1 ohm                    


Explanation :
No Explanation available for this question

A 50 Hz voltage is measured with a moving iron voltmeter and a rectifier type ac voltmeter connected in parallel. If the meter readings are V1 and V2 respectively and the meters are free from calibration errors, then the form factor of the ac voltage may be estimated as    

1.  V1 / V2                                         

2.  1.11 V1 / V2                                    

3.    √2 V1 / V2                            

4.      ∏ V1 / V2      

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4
Correct Answer :

1.11 V1 / V2                                    


Explanation :
No Explanation available for this question

If a dc voltmeter is made from an ammeter having a full-scale deflection of 100 micro amperes, then its sensitivity (in k-ohm/V) will be    

1.  1                       

2.      10                            

3.     100                            

4.      1000

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Correct Answer :

    10                            


Explanation :
No Explanation available for this question

When damping of an instrument is adjusted to enable the pointer to rise quickly to its deflected position without overshooting, in that case the instrument is said to be

1.  Dead-beat                                 

2.  Off-beat

3.  Over-damped

4.  Under-damped

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4
Correct Answer :

Dead-beat                               

 



Explanation :
No Explanation available for this question

The resistance of two coils of a wattmeter are 0-0.1 ohm and 1000 ohms respectively and both are non-inductive. The load current is 20A and the voltage across the load is 30 V. In one of the two ways of connecting the voltage coil, the error in the reading would be

1.  0.1  % too high  

2.  0.2  % too high  

3.  0.15% too high  

4.  Zero 

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4
Correct Answer :

0.15\% too high

 


Explanation :
No Explanation available for this question

The measurement of a quantity    

1.  Is an act of comparison of an unknown quantity with another quantity

2.  Is an act of comparison of an unknown quantity with a known quantity whose accuracy may be known or may not be known

3.  Is an act of comparison of an unknown quantity with a predefined acceptable standard which is accurately known

4.  None of these

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4
Correct Answer :

Is an act of comparison of an unknown quantity with a predefined acceptable standard which is accurately known


Explanation :
No Explanation available for this question

A piezo electric transducer has the following parameter values Crystal capacitance = 10-9 F Cable capacitance = 2 × 10-10 F Charge sensitivity = 4 × 10-6 coulomb/cm If the oscilloscope used for read-out has an input resistance of 1 MW in parallel with C = 4 × 10-10 F, then the voltage sensitivity constant will be      

1.  2500 V/cm                         

2.    3334 V/cm                          

3.      4000 V/cm              

4.    4500 V/cm

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4
Correct Answer :

2500 V/cm                         


Explanation :
No Explanation available for this question

The voltage of a circuit is measured by a voltmeter having an input impedance comparable with the output impedance of the circuit thereby causing error in voltage measurement. This error may be called    

1.  Gross error

2.  Random error

3.  Error caused by mistake of instrument

4.  Error caused by loading effect

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4
Correct Answer :

Random error


Explanation :
No Explanation available for this question

In the centre zero analog ammeter having a range of – 10 A to + 10 A, there is a detectable change of the pointer from its zero position on either side of the scale only if the current reaches a value of 1 A (on either side). The ammeter has a    

1.  Resolution of 1 A

2.  Dead zone of 1 A

3.  Dead zone of 2 A

4.  Sensitivity of 1 A

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4
Correct Answer :

Dead zone of 2 A


Explanation :
No Explanation available for this question
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