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 less end thrust
Strength and cost
Noise level and economy

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Balance the timing in the movement of the two groups of pistons
Increase inertia force of the rotating crankshaft
Adjusts the timing of the intake and exhaust valve openings
Reduce vibrations caused by the crankshaft rotation

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