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 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
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 rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level

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Automobile Engineering in ME
The purpose of a cylinder head gasket is to

Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head
None of these
Removes impurities from cylinder head lubricating oil
Prevent engine oil from going into combustion chamber

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Automobile Engineering in ME
In bias ply tyres

One ply layer runs diagonally one way and another layer runs diagonally the other way
All plies run parallel to one another
Belts of steel mesh are used in the tyres
All of these

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