Automobile Engineering in ME
Highest useful compression ratio (HUCR) is the highest compression ratio at which the

Engine gives maximum output
Engine can run
Engine is most efficient
Fuel can be used in a test engine without knocking

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

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

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Adjusts the timing of the intake and exhaust valve openings
Reduce vibrations caused by the crankshaft rotation
Balance the timing in the movement of the two groups of pistons
Increase inertia force of the rotating crankshaft

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Automobile Engineering in ME
In radial tyres

All plies run parallel to one another and vertical to tyre bead
One ply layer runs diagonally one way and another layer runs diagonally the other way
Inner tubes are always used
None of these

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