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Obtain the expressions for maximum acceleration, tractive efforts and reactions
for a four wheeled vehicle when the drive is given to i) Front wheels ii) rear

wheels
Obtain the expression for the final forces acting on the limbs of an independent

suspension under the action of vehicle force and horizontal force.
Define roll axis.
PART ட்‌
Answer any two full questions, each carries 20 marks.
Discuss in detail about the mechanics of air flow over a vehicle.

Derive the equation for braking efficiency and stopping distance.
Explain brake fade.
Derive the expressions for forces acting on a four wheeler moving on a level

road when brakes are applied to i) rear wheels ii) front wheels
What is rolling resistance? Describe in detail about the factors that affect the

rolling resistance.
The resistance to the motion of a motor car when running on the level with the

engine free is given by R= a+bV*, where a and b are constants and V is in Km/h.
A vehicle weighing 15402 N with a free engine while running down a slope of 1
in 30 reaches a speed of 56 km/h, while running down a slope of | in 20 reaches
a speed of 80 km/h. The engine is declutched after the car is run upto 96 km/h on
level. Assuming that the mean resistance during running down is 45% that of 96
km/h, Calculate the distance run by the vehicle before it comes to rest (a) If the
brakes are not applied (b) If in addition to resistance above a constant braking
force of 2403.5 N is applied

Explain different aerodynamic aids which are used to reduce drag.

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