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Physics Chemistry

Engineering :: Production Engineering

  In a drilling machine having six spindle speeds if first five speeds are 458, 605, 800, 1055 and 1390 rpm, the next higher speed would be
[A]. 1440 rpm[B]. 1500 rpm
[C]. 1630 rpm[D]. 1760 rpm
[E]. 1830 rpm    

Answer: Option E
SHIMPI said:    
 
N1/N2 = N2/N3 = .........=N5/N6
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