Automobile Engineering in ME
The difference between DOT 3 and DOT 4 brake fluids is

DOT 4 fluid is more resistant to freezing than DOT 3 fluid
DOT 4 fluids have a lower boiling point than DOT 3 fluid
DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
DOT 4 fluids have a higher boiling point than DOT 3 fluid

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Automobile Engineering in ME
The correct flow of power through the drive train is

Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels
Engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels
Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels
Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels

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Automobile Engineering in ME
The function of a second ring is that it is a

Back up compression ring which will work in place of the top ring when it is broken
Back up oil control ring which will work in place of the bottom ring when it is broken
Cushion ring which prevents piston slap and knock
Compression ring and aids the top ring in sealing and cooling

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