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An instantaneous configuration of a four-bar mechanism, whose plane is horizontal, is shown in the figure below. At this instant, the angular velocity and angular acceleration of link O2A are w=8rad/s and a=0, respectively, and the driving torque (t) is zero. The link O2A is balanced so that its center of mass falls at O2.
[1] Which kind of 4-bar mechanism is O2ABO4? [2 marks]
(a) Double-crank mechanism
(b) Crank-rocker mechanism
(c) Double-rocker mechanism
(d) Parallelogram mechanism[2] At the instant considered, what is the magnitude of the angular velocity of O4B?
[2 marks]
(a) 1 rad/s
(b) 3 rad/s
(c) 8 rad/s
(d) 64 rad/s[3] At the same instant, if the component of the force at joint A along AB is 30 N, then the magnitude of the joint reaction at O2 [2 marks]
(a) is zero
(b) is 30 N
(c) is 78 N
(d) cannot be determined from the given dataasked in Mechanical Engineering, 2005
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The distribution of lead-time demand fro an item is as follows:
Lead time demand Probability 80 0.20 100 0.25 120 0.30 140 0.25
(a) 25%
(b) 50%
(c) 75%
(d) 100%
asked in Mechanical Engineering, 2005
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