Theory of Machine
Which of the below are inversions of slider crank mechanism? 1. Oscillating cylinder engine mechanism 2. Toggle mechanism 3. Radial cylinder engine mechanism 4. Quick return mechanism

1, 2 and 3
1, 2 and 4
1, 3 and 4
2, 3 and 4

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Theory of Machine
Pitch point on a cam is

The point on cam pitch curve having the minimum pressure angle
Any point on pitch circle
The point on cam pitch curve having the maximum pressure angle
Any point on pitch curve

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