Discussion
Which device preheats the combustion chamber of a diesel?
Answer: C
A glow plug heats a small region of the combustion chamber so the compressed charge reaches ignition temperature from cold. Grid heaters in the intake genuinely serve the same purpose on many larger engines, which makes the last option a real alternative. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking which component actually carries the load settles most questions of this kind at once. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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