Automobile Engineering in ME
A basic difference between the spark ignition engine and the Diesel engine is that the

Diesel engine compresses air alone instead of an air-fuel mixture
All of these
Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke
Air temperature ignites the fuel in the Diesel engine

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Automobile Engineering in ME
The correct flow of power through the drive train is

Engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels
Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels
Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels
Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels

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Automobile Engineering in ME
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Reduces the amount of kickback for large steering angles
Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
Allows the steering wheel to be turned by a greater amount when steering
Makes the steering more responsive

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