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

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

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Automobile Engineering in ME
The main task of a battery in automobiles is to

Supply a large amount of power to turn the starter motor when the engine is being started
Act as a reservoir or stabilizer of electricity
Supply electricity to the alternator
Supply electricity to the vehicle's electrical system at all times while the engine is running

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Automobile Engineering in ME
The path taken by intake air is

Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders
Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders
Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders

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