Question

Match List I with List II

List I & List II
A. Precision & I. Maximum distance or angle through which any part of mechanical system may be moved without causing motion of next part
B. Drift & II. Smallest increment in measurand that can be detected with certainty by instrument
C. Resolution & III. Gradual departure of the instrument output from the calibrated value
D. Backlash & IV. The ability of device to give identical output on repetition of same input signal

Choose the correct answer from the options given below:

• A. A-III, B-II, C-I, D-IV
• B. A-III, B-IV, C-II, D-I
• C. A-IV, B-III, C-II, D-I
• D. A-IV, B-I, C-III, D-II

Hint:

Create flashcards for these key instrumentation terms:
• Precision = Reproducibility
• Accuracy = Closeness to true value
• Resolution = Smallest detectable change
• Drift = Slow change over time
• Backlash = Mechanical play/gap This will help you answer matching questions quickly.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
This question requires matching terms related to instrumentation and measurement with their correct definitions. We need to know the meaning of Precision, Drift, Resolution, and Backlash.

Step 2: Detailed Explanation:
Let's define each term in List I and match it with the correct definition in List II.

• A. Precision: Precision is the degree of reproducibility of a measurement. It describes the ability of an instrument to give the same output when the same input is applied repeatedly. This directly matches definition IV. The ability of device to give identical output on repetition of same input signal. So, A matches with IV.

• B. Drift: Drift is an undesirable, slow change in the output of an instrument over a period of time, for a constant input. It represents a gradual departure from the calibrated value, often due to environmental changes or aging of components. This perfectly matches definition III. Gradual departure of the instrument output from the calibrated value. So, B matches with III.

• C. Resolution: Resolution (or discrimination) of an instrument is the smallest change in the input signal (measurand) that can be detected and will produce a noticeable change in the output. This matches definition II. Smallest increment in measurand that can be detected with certainty by instrument. So, C matches with II.

• D. Backlash: Backlash is a phenomenon in mechanical systems, like gears or linkages, where there is a small gap or "play" between mating parts. It is the maximum distance or angle one part can be moved in the reverse direction without causing the connected part to move. This exactly matches definition I. Maximum distance or angle through which any part of mechanical system may be moved without causing motion of next part. So, D matches with I.

Step 3: Final Answer:
Based on the matching:
A \(\rightarrow\) IV
B \(\rightarrow\) III
C \(\rightarrow\) II
D \(\rightarrow\) I
This corresponds to the option A-IV, B-III, C-II, D-I.