Theory of Machine
To obviate axial thrust, following gear drive is used

Single helical gear in which one of the teeth of helix angle a is more
Double helical gears having opposite teeth
Mutter gears
Double helical gears having identical teeth

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Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other.

Zero
Any +ve value
Infinity
Any -ve value

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Theory of Machine
The maximum fluctuation of energy is the

Sum of the maximum and minimum energies
Variations of energy above and below the mean resisting torque line
Ratio of the mean resisting torque to the work-done per cycle
Difference between the maximum and minimum energies

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