Automobile Engineering in ME
The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as

None of these
Valve timing diagram
Axial force diagram
Indicator diagram

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

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Automobile Engineering in ME
In a ventilated disc brake

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

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