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

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

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Automobile Engineering in ME
The main function of the tread pattern on tyre is that

The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
The crests between the tread grooves absorb road noise
In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface

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