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At which angle primary unbalanced force in reciprocating engine mechanism is maximum?

Q.  
At which angle primary unbalanced force in reciprocating engine mechanism is maximum?


Answer & Explanation

Primary unbalance force in reciprocating engine is given by,
Fp = mrω2cosθ
the above term gives maximum Fp at θ= 0° or 180°.

Thus correct option is: A.

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