Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

135° and 315°
0° and 90°
90° and 180°
270° and 360°

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

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

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