Automobile Engineering in ME
Two advantages of using helical gears rather than spur gears in a transmission system are

Strength and cost
Strength and less end thrust
Noise level and economy
Noise level and strength

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Automobile Engineering in ME
The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

None of these
Absorb the vibrations transferred from the surface of the road
Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
Absorb any difference in speed between the left and right wheels when the vehicle is turning

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Automobile Engineering in ME
Incorrect steering axis inclination (S.A.I.) causes

The vehicle to pull to the side of lesser inclination
Poor recovery of the steering wheel after making a turn
Tendency to assume toe-out orientation
Generation of a braking effect at tight corners

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