Question

The main difference between the internal combustion engine and the diesel engine is that the diesel engine

A. does not utilize pistons.
B. does not have a crankshaft.
C. has no ignition system.
D. has no connecting rods.

Answer 1

The diesel engine has no ignition system. (C)
It depends on the compression of the fuel/air mixture to ignite the mixture.

This may be a big part of the reason that Diesel engines always
sound to me as if they are falling apart.