# In the circuit given in the figure, the limiting error in the, power dissipation I2R in the resistor R is

1.  1.2%

2.  5.2%

3.  10.2%

4.  25.2%

4

10.2\%

Explanation :
No Explanation available for this question

# A 150 V moving iron voltmeter of accuracy class 1-0 reads 75 V when used in a circuit under standard conditions. The maximum possible percentage error in the reading is

1.  0.5

2.  1.0

3.  2.0

4.  4.0

4

2.0

Explanation :
No Explanation available for this question

# A distorted sinusoid has the amplitudes A1,A2,A3 ..... of the fundamental second harmonic third harmonic, respectively. The total harmonic distortion is

1.  √A21+A22+A32+---/A1

2.  √A22+A32+----/A1

3.  √A22+A32+---/A12+A22+A32+---

4.  1-√A22+A32+-----/A1

4

√A22+A32+----/A1

Explanation :
No Explanation available for this question

# A resistance is measured by the voltmeter-ammeter method employing DC excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter readings are subject to maximum possible errors of 2.4% and 1.0 % respectively, then the magnitude of maximum possible percentage error in the value of resistance deduced from the measurement is nearly

1.  1.4%

2.  1.7%

3.  2.4%

4.  3.4%

4

3.4\%

Explanation :
No Explanation available for this question

# Four ammeter M1 , M2, M3 and M4 with the following specifications are available Instrument Type Full scale Accuracy value (A) % of FS M13 1/2 digit dual scope 20 0.10 M2PMMC 10 20 M3Electrodynamic 5 0.50 M4Moving iron 1 1.00 A current of 1 A is to be measured. To obtain minimum error in the reading, one should select meter

1.  M1

2.  M2

3.  M3

4.  M4

4

M3

Explanation :
No Explanation available for this question

# Which one of the following statement is not correct

1.  It is not possible to have precise measurement which are not accurate

2.  Correctness in measurement requires both accuracy and precision

3.  Reproducibility and consistency are expressions that best describe precision in measurements

4.  An instrument with 2% accuracy is better than another with 5% accuracy

4

Correctness in measurement requires both accuracy and precision

Explanation :
No Explanation available for this question

# A thermocouple

1.  has a low time constant when it is bare

2.  has a low time constant if is provided with a sheath

3.  has the same time constant whether it is bare or is provided with sheath

4.  none of these

4

has a low time constant when it is bare

Explanation :
No Explanation available for this question

# Two strain gauges are used to measure strain in a cantilever. One gauge is mounted on top of e cantilever  and the other is placed at the bottom. The two strain gauges form two arms of a voltage sensitive wheat stone bridge. This bridge configuration is called

1.  a guarter bridge

2.  a half bridge

3.  a full bridge

4.  a null bridge

4

a half bridge

Explanation :
No Explanation available for this question

# A null type of instrument as compared to a deflection type instrument has

1.  a higher accuracy

2.  a lower sensitivity

3.  a faster response

4.  all of these

4

a higher accuracy

Explanation :
No Explanation available for this question

# When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initial short circuited because

1.  cables have a low value of initial resistance

2.  cables have a high value of capacitance which draws a high value of charging current

3.  cables have a low value of capacitance which draws a high value of charging current

4.  none of these

4