Automobile Engineering in ME
The purpose of a thermostat in an engine cooling system is to

Allow the engine to warm up quickly
Indicate the coolant temperature
Prevent the coolant from boiling
Pressurise the system to raise the boiling point

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

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

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Automobile Engineering in ME
The order in which effort applied to the steering wheel is transferred to the front wheel is

Steering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels
Steering wheel, tie rod, steering gearbox, steering shaft, steering knuckle, front wheels
Steering wheel, steering shaft, steering gearbox, tie rod, steering knuckle, front wheels
Steering wheel, steering gearbox, steering shaft, tie rod, steering knuckle, front wheels

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