Automobile Engineering in ME
If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

Most economical mixture
Too rich mixture
Stoichiometric mixture
Too lean mixture

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Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics
It is desired to have more flexibility in design
Large changes in load make it necessary to have a large suspension stroke
It is desired to reduce the unsprung mass

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Automobile Engineering in ME
The function of anti-lock brake system (ABS) is that is

Prevents nose dives during braking and thereby postpones locking of the wheels
Reduces the stopping distance
Maintains directional control during braking by preventing the wheels from locking
Minimizes the brake fade

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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
Keeping the vehicle without use for an extended period
An excessively high engine speed on a downhill road
Overcooling of the brakes during high speed driving

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