Velocity analysis of NonGrashof four bar mechanism

For a constant input angular velocity which of the following is true always?
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For parallelogram linkage (length of input and output are same, length of coupler and fixed link are same) ?
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Which of the following has angular acceleration zero always?
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What is the velocity of point P shown in the figure. Given that AB=CD=PC, AD=BC, velocity of B = 10cm/s
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In a mechanism with input link 30cm and coupler 40cm, what is the magnitude of velocity of Output link at an instant when the coupler forms a right angle with the input link and both input and coupler are rotating at an angular speed of 1rad/s?
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