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

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

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Automobile Engineering in ME
Wheel base of a vehicle is the

Distance between the centres of the front tyres
Distance between the centres of the rear tyres
Extreme length of the vehicle
Distance between the centres of the front and rear wheels

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