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

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

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Automobile Engineering in ME
In which of the following conditions, the idle CO percentage should be measured with the vehicle?

Headlights and other lights are switched off
Headlights and other electrical devices are switched off
Headlights are switched on
Headlights and other electrical devices are switched on

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