Automobile Engineering in ME
If the valve clearances are excessively large, the problem that can arise is

Incomplete valve closure
None of the listed here
Fouling of spark plug by gasoline
Overheating of the engine

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Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Warm up and lubricate the pump
Pressurise the fuel system before the engine is started
Supplies a large amount of fuel and thereby creates a choke effect
Enable the pump's fault diagnosis function to operate

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

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

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