Theory of Machine
The power of a Porter governor is equal to

[2c²/(1 + 2c)] (m + M) g.h
[4c²/(1 + 2c)] (m + M) g.h
[3c²/(1 + 2c)] (m + M) g.h
[c²/(1 + 2c)] (m + M) g.h

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
The Ackerman steering gear is most economical
The Ackerman steering gear consists of turning pairs
Both (A) and (B)

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