Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
It cools the engine by blowing air onto the cylinder block
It blows air through the radiator when necessary
It draws heat out of the engine compartment

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Automobile Engineering in ME
The function of a second ring is that it is a

Cushion ring which prevents piston slap and knock
Compression ring and aids the top ring in sealing and cooling
Back up oil control ring which will work in place of the bottom ring when it is broken
Back up compression ring which will work in place of the top ring when it is broken

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Automobile Engineering in ME
The main function of a master cylinder is to

Adjust the extent of brake pedal free play
Boost the force applied to brake pedal
Ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Convert brake pedal force into hydraulic pressure

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

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