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 is most efficient
Engine gives maximum output

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Automobile Engineering in ME
The condition that causes vapour locking in a brake system is

Overheating of the fluid due to frequent brake application
An excessively high engine speed on a downhill road
Overcooling of the brakes during high speed driving
Keeping the vehicle without use for an extended period

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

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