Automobile Engineering in ME
The composition of the electrolyte in a fully charged battery is that

The electrolyte is pure sulphuric acid
The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
The electrolyte is pure distilled water
The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight

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

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

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Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Pressurise the fuel system before the engine is started
Supplies a large amount of fuel and thereby creates a choke effect
Enable the pump's fault diagnosis function to operate
Warm up and lubricate the pump

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