Automobile Engineering in ME
Two advantages of using helical gears rather than spur gears in a transmission system are

Strength and less end thrust
Noise level and strength
Noise level and economy
Strength and cost

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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

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

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