+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

0 votes
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°

Related questions

We welcome you to Carrieradda QnA with open heart. Our small community of enthusiastic learners are very helpful and supportive. Here on this platform you can ask questions and receive answers from other members of the community. We also monitor posted questions and answers periodically to maintain the quality and integrity of the platform. Hope you will join our beautiful community