Answer :
Final answer:
Dial indicator inaccuracies in linear instrument movements are typically expressed in terms of percentage error or graduations/divisions. These terms relate to the precision of measurement and the instrument's resolution, impacting the reliability of data collected. So the correct answer is option C and D.
Explanation:
Dial indicator inaccuracies of linear instrument movements are often stated in terms of percentage error or graduations or divisions. This is because these instruments measure displacements or movements linearly, and their accuracy is dictated by how well they can replicate these measurements over their scale. The concept of resolution is crucial here, as it defines the smallest increment of measurement that an instrument can reliably indicate. Higher resolution instruments can detect smaller changes, leading to potentially lower percentage errors and allowing readings to be more precise, down to the smallest graduation or division on the scale.
Errors in measurement can arise from several sources, including the inherent limit to the precision offered by the instrument (resolution), calibration issues leading to systematic errors such as zero error, and the user's ability to interpret the scale accurately, which may introduce indeterminate errors. The accuracy of a measurement is often related to the smallest division on the instrument's scale and the operator's capability to estimate values between these divisions accurately.
It is crucial in experimental settings to understand and account for these types of inaccuracies, as they directly affect the reliability and validity of the data collected. Therefore, when expressing instrument inaccuracies, referring to percentage error or the number of graduations or divisions provides a clearer picture of an instrument's capability to deliver precise measurements.
