Electrical & Electronics Measurements Objective Questions – Set 6

Consider the following statements: In a measuring instrument, 1. Linearity is more important than sensitivity. 2. High precision indicates high accuracy 3. Accuracy cannot be better than resolution. Of these statements

The ratio of change in output to the change in the input is called

A first order instrument is characterized by

Which of the quantity consists of unit as newton-second?

Two capacitance, C₁ = 150 ± 2.4µF and C₂ = 120 ± 1.5 µF are connected in parallel. What is the limiting error of the resultant capacitance C (in µF) ?

Which one of the following meters has maximum loading effect on the circuit under measurement ?

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 reading are subject to maximum possible errors of ± 2.4 % and ± 1.0 % respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is nearly

A 0 - 150 V voltmeter has a guarantees an accuracy of 1% of full scale reading. The voltage measured by this instrument is 75 V. What is the limiting error ?

A transducer measures a range of 0 – 200 N force with a resolution of 0.15 percent of full scale. What is the smallest change which can be measured by this transducer?

Which of the quantity consists of unit as Pascal ?

The difference between the indicated value and the true value of a quantity is

The limiting errors of measurement of power consumed by and the current passing through a resistance are ±1.5% and ±1% respectively. What is the limiting error ( in %) of measurement of resistance?

The expected value of the voltage across a resistor is 80 V, and the measured value is 79 V. What is the percentage error and relative accuracy of the measurement ?

The total current I = I₁ + I₂ in a circuit is measured as I₁ = 150 ± 1A , I₂ = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

To measure 5 volts, if one selects a 0-100 volt range voltmeter which is accurate with in ± 1%, then the error in this measurement may be up to

Which one of the following units is a fundamental unit?

The total current I = I₁ + I₂ in a circuit is measured I₁ = 150 ± 3A , I₂ = 250 ± 4 A, where the limits of error are given as standard deviations. I is measured as

The three resistors R₁, R₂ and R₃ have the following ratings: R₁ = 25Ω ± 4%, R₂ = 65 Ω ± 4%; R₃ =45 Ω ± 4%. If the resistance are connected in series, then limiting error produced in equivalent resistance is

Which of the quantity consists of SI unit as Candela?

Assertion (A) : It is always desirable to take the reading of an indicating instrument very close to the full scale reading. Reason (R) : Accuracy of an indicating instrument is maximum at the full scale deflection and error increases as reading comes closer to the beginning of the scale.

A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

A voltage of 2.70 V is being measured by an analog indicating instrument having a scale range of 0 – 5.0 V. If the instrument reads 2.65 V, then absolute error in measurement is

To measures 5 volts, if one selects a 0-100 volt range voltmeter which is accurate with in ± 1%, then the error in this measurement may be up to

A 0 - 200 V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by this instrument is 50 V. What is the limiting error?

What is the name of physical quantities which are independent of each other?

Which one the following statements is correct ? The application of the instrument in wrong manner in the procedure of measurement results in a/an

0-150 V voltmeter has an accuracy of 1% of full-scale reading. The voltage measured by the instrument is 75 V. The limiting error is

The current ‘I’ through a resistance R is measures with the following uncertainties I = 4 A ± 0.5%, R = 100Ω±0.2%. If power is computed from these two measured quantities, the uncertainty in the power computed will be

A variable w is related to three other variables x, y and z as w = xy/z. The variables are measured with meters of accuracy ± 0.5% reading, ± 1% of full scale value and ± 1.5% reading. The actual readings of the three meters are 80, 20 and 50 with 100 being the full scale value for all three. The maximum uncertainty in the measurement of w will be

Dynamic errors are caused by