The resultant unbalanced force is minimum in reciprocating engines when the part of mass of reciprocating is balanced with rotating mass
A
23
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B
12
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C
23
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D
35
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Solution
The correct option is B12 Let c be the fraction of mass balanced Primary force balanced=cmrω2cosθPrimary force unbalanced =(1−c)mrω2cosθVertical component of centrifugal force which is unbalanced =cmrω2sinθResultant unbalance force