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

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

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Automobile Engineering in ME
In a ventilated disc brake

Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
Disc contains many small holes for optimum cooling performance
A duct directs air towards the caliper for cooling while the vehicle is moving
Caliper is covered with cooling fins

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