+1 vote
in Machine Kinematics by (38.0k points)
The crankshaft of reciprocating engine having a 20 cm crank and 100 cm connecting rod rotates at 210 r.p.m. When the crank angle is 45^o, the velocity of piston is nearly

(a) 1.8m/s

(b) 1.9m/s

(c) 3.5m/s

(d) 19m/s

The question was posed to me in final exam.

My question is based upon Four Bar Chain or Quadric Cycle Chain in division Simple Mechanisms of Machine Kinematics

1 Answer

0 votes
by (106k points)
Correct answer is (c) 3.5m/s

To explain: Vp = ωr(sinϴ + sin2ϴ/2n)

ω = 2пN/60 = 21.98rad/sec

r = 6.2m

n = l/r = 100/20 = 5

therefore, Vp = 21.980 x 0.2(sin45^o + sin90^o/2 x 5)

                         = 3.5m/sec.

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