Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

Non vertical external forces are supported by the suspension arms
The vertical size of the suspension can be made more compact
The assembly is slightly more complicated in design
The unsprung mass in lighter

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

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

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Automobile Engineering in ME
It is necessary to maintain the valve clearances as they

Reduce the resistance to sliding that occurs between the cam and the tappet
Allow for lengthening of the valves owing to the heat of combustion
Increase the speed at which the valves move up and down
Make the crankshaft turn smoothly

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