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

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

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Automobile Engineering in ME
When the front wheels of a vehicle are locked during braking, then

Driver loses control over the steering, and the vehicle continues moving in its current direction
Front tyres skid across the road surface, and the vehicle spins around
Stopping distance becomes extremely long
Rear tyres skid across the road surface, and the vehicle spins around

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