+1 vote
in Machine Dynamics by (34.3k points)
If the crank and the connecting rod are 300 mm and 1 m long respectively and the crank rotates at a constant speed of 250 r.p.m., determine the crank angle at which the maximum velocity occurs is ____

(a) 45

(b) 75

(c) 90

(d) 60

I have been asked this question in examination.

I would like to ask this question from Angular Velocity and Acceleration of the Connecting Rod topic in section Inertia Forces in Reciprocating Parts of Machine Dynamics

1 Answer

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by (38.6k points)
Right answer is (b) 75

The best explanation: For maximum velocity of the piston : cosθ + 2cos(2θ)/2n = 0

n = l/r : 1/.3 = 3.33

therefore, θ = 75°

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