Theory of Machine
In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

Equal to sum of other two
Less than sum of other two
There is no such relationship
Greater than sum of other two

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Theory of Machine
The maximum fluctuation of speed is the

Difference of minimum fluctuation of speed and the mean speed
Difference of the maximum and minimum speeds
Sum of maximum and minimum speeds
Variations of speed above and below the mean resisting torque line

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