Automobile Engineering in ME
The three basic cylinder arrangements for automotive engines are

In line, V, and opposed
Flat, radial, and V
V, double row, and opposed
In a row, in line, and opposed

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

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

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Automobile Engineering in ME
Wheel base of a vehicle is the

Distance between the centres of the rear tyres
Extreme length of the vehicle
Distance between the centres of the front tyres
Distance between the centres of the front and rear wheels

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