Question

1. what occurs in a steam engine?

○ all heat is used for work
○ fuel is burned inside the engine
○ fuel is burned outside the engine

Explanation:

• For the first option: In a steam engine, not all heat is used for work (some is lost), so this is incorrect.
• For the second option: Steam engines are external combustion engines, so fuel is not burned inside the engine.
• For the third option: Steam engines burn fuel (like coal, wood) outside the engine to heat water and produce steam, which then does work inside the engine. So this is correct.

Answer:

C. fuel is burned outside the engine (assuming the options are labeled A, B, C as per typical multiple - choice with the first option as A, second as B, third as C)