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Electrical Measuring Instruments Classification

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Electrical Measuring Instruments Classification

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Questions and Answers

What is the main purpose of integrating instruments?

To register the voltage and current in a circuit

To measure the total amount of electrical energy supplied to a circuit (correct)

To analyze the error in electrical measurements

To measure the total quantity of electricity supplied to a circuit

Which physical effect is NOT utilized in the operation of measuring instruments?

Thermal Effect

Piezoelectric Effect (correct)

Electrostatic Effect

Electromagnetic Effect

What is the formula to calculate the relative (percentage) limiting error?

$rac{A_n - A_a}{A_a} imes 100$

$rac{A_a}{A_n} imes 100$

$rac{A_n - A_a}{A_n} imes 100$ (correct)

$rac{A_a - A_n}{A_n} imes 100$

Which type of error is caused by the observer's mistakes in reading or using the instrument?

Gross Error Signup and view all the answers

What is the main way to avoid instrumental errors in measuring instruments?

All of the above Signup and view all the answers

Which type of error is caused by the effects of the environment on the measuring instrument?

Environmental Error Signup and view all the answers

What is the main classification of electrical measuring instruments discussed in the text?

Absolute and secondary Signup and view all the answers

What is a key characteristic of absolute instruments?

They measure electrical quantities based on their physical constants. Signup and view all the answers

Which statement about secondary instruments is true according to the text?

They must be pre-calibrated against an absolute instrument. Signup and view all the answers

What is the purpose of indicating instruments?

To show the instantaneous value of an electrical quantity at the time of measurement. Signup and view all the answers

How do recording instruments present the variations in the measured quantity?

By tracing a continuous path on a moving chart using an ink pen. Signup and view all the answers

Which of the following is an example of an indicating instrument according to the text?