Automobile Engineering in ME
Highest useful compression ratio (HUCR) is the highest compression ratio at which the

Engine is most efficient
Engine gives maximum output
Engine can run
Fuel can be used in a test engine without knocking

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Automobile Engineering in ME
In bias ply tyres

All plies run parallel to one another
Belts of steel mesh are used in the tyres
All of these
One ply layer runs diagonally one way and another layer runs diagonally the other way

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Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Delivers improved cornering on dry road surfaces
Ensures that effective braking can be performed, even on slippery surfaces
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Eliminates the need of snow tyres, tyre chains, etc.

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Automobile Engineering in ME
The major purpose of an electronically controlled automatic transmission is that this type of transmission

Reduces shift shock and achieves more efficient transmission of engine torque
Eliminates gear clutches
Reduces the number of automatic transmission components
Eliminates the gear shaft lever

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