Discussion
A distortion index is computed as \( (P_{max} - P_{min})/P_{average} \). With values of 98, 86 and 94 kilopascals respectively, the index is
Answer: A
Correct answer: 0.128
\[ \frac{98 - 86}{94} = \frac{12}{94} = 0.128. \] The index measures the spread across the compressor face relative to the mean, and a figure of this size would concern an engine manufacturer - distortion of a few per cent is enough to move the surge line appreciably.
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