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

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

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Automobile Engineering in ME
Which one of the following statements correctly describes the construction of a planetary gear type differential?

Each planetary pinion gear meshes with both the central gear and the internal gear.
One drive shaft is splined to the central gear and the other to the planetary gear.
The internal gear is fixed to the planetary gear.
The six planetary pinions rotate in constant mesh with the internal gears.

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

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