Automobile Engineering in ME
In a Diesel engine, the function of a fuel injector is to

Spray atomized fuel in the cylinder
Ignite the air-fuel mixture
Provide flame front for ignition
Mix the fuel and air

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Automobile Engineering in ME
The function of a proportioning control valve (PCV) in a brake system is to

Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation
Reduce the brake fluid pressure when the brakes approach their lockup point
Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level
Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level

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