Numerical - Geometric progression ratio, given speed & speed steps

Q.  What is the geometric progression ratio if maximum and minimum spindle speeds are 500 r.p.m and 300 r.p.m respectively? (Number of speed steps = 7)
- Published on 16 Sep 15

a. 0.91
b. 1.5
c. 1.08
d. 2.0

ANSWER: 1.08

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