Automobile Engineering in ME
The function of an alternator in an automobile is to

Partly converts engine power into electric power
Continually recharges the battery
Supply electric power
Converts mechanical energy into electrical energy

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Automobile Engineering in ME
The compression ratio in petrol engine is kept less than in Diesel engine because

Less compression ratio gives better performance
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
It makes petrol engines lighter
It is just customary to have less compression ratio in petrol engines

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Automobile Engineering in ME
Wheel base of a vehicle is the

Distance between the centres of the rear tyres
Distance between the centres of the front and rear wheels
Distance between the centres of the front tyres
Extreme length of the vehicle

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Automobile Engineering in ME
In a ventilated disc brake

Caliper is covered with cooling fins
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
A duct directs air towards the caliper for cooling while the vehicle is moving
Disc contains many small holes for optimum cooling performance

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