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

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
Diesel engine compresses air alone instead of an air-fuel mixture
Air temperature ignites the fuel in the Diesel engine

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Automobile Engineering in ME
The path taken by intake air is

Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders
Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders
Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders
Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders

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Automobile Engineering in ME
An imbalance wheel during vehicle operation

Creates a standing wave
Bounces vertically or deflects from side to side (as seen from front or rear)
Deflects in the vehicle's longitudinal direction
Makes large noise when its heavy point hits the road surface

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