The headstock of a lathe has 9 speeds with minimum speed of 100 r.p.m. – McqOptions

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1.	The headstock of a lathe has 9 speeds with minimum speed of 100 r.p.m. and maximum speed of 1600 r.p.m. If the speeds are in geometric progression, then the ratio is
A.	1.06
B.	1.22
C.	1.41
D.	1.64
Answer» D. 1.64

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