Heat Engine Quiz

What is the main purpose of a heat engine?

• To create heat from mechanical work

• To convert heat into mechanical work

• To cool down systems

• To store thermal energy

According to the Second Law of Thermodynamics,

• Heat can be completely converted into work

• Energy can be created or destroyed

• Some energy is always lost as waste heat

• Engines can be 100% efficient

What does a heat engine need to operate?

• A hot place and a cold place

• Only a power switch

• A battery and wires

• Ice and steam

Where does a heat engine get its energy from?

• Electricity

• Friction

• Thermal energy from a high-temperature source

• Nuclear reactions only

What happens to the energy that a heat engine cannot convert into work?

• It disappears

• It is stored

• It becomes waste heat and is released

• It increases the engine's temperature

Which of the following is an example of a real-world heat engine?

• Refrigerator

• Solar panel

• Car engine

• Battery

Why is it impossible for a heat engine to be 100% efficient?

• Energy is destroyed in the process

• There is always some energy that must escape as heat

• The engine cools down too fast

• The law of gravity prevents it