What is harmonic progression?

Q.  What is harmonic progression?
- Published on 18 Sep 15

a. Difference between reciprocal of two successive spindle speeds is constant
b. Difference between two successive spindle speeds is constant
c. Ratio of two successive spindle speeds is constant.
d. Ratio of two successive spindle speeds is variable.

ANSWER: Difference between reciprocal of two successive spindle speeds is constant

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