Thermodynamics Quiz on Carnot Cycle

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Questions and Answers

What is the work done during the adiabatic process for two moles of helium gas in a Carnot cycle between thermal reservoirs at 327°C and 127°C?

24.93 J
498.6 J
41.55 J
49.86 J (correct)

Which statement is true regarding the efficiencies of heat engines?

All ideal heat engines have the same efficiency.
Using heat from one engine to power another is acceptable.
Only real engines can reach 100% efficiency.
Only ideal heat engines can achieve maximum efficiency. (correct)

If a heat engine absorbs heat and performs work such that the heat absorbed is three times the work done, what percentage of the absorbed heat is released to the cold reservoir?

52%
67% (correct)
45%
33%

During a Carnot cycle, if 54 grams of ice melt, approximately how much steam condenses in each cycle?

<p>148.9 g (A)</p> Signup and view all the answers

What is the maximum theoretical efficiency of a Carnot engine that absorbs 800 J of heat and releases 360 J to the cold reservoir?

<p>0.456 (A)</p> Signup and view all the answers

Flashcards

Carnot Cycle

A thermodynamic cycle consisting of four reversible processes: isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression. It's the most efficient possible heat engine.

Heat Engine Efficiency

The efficiency of a heat engine is the ratio of the work done to the heat absorbed from the hot reservoir. It represents the effectiveness of converting heat into work.

Second Law of Thermodynamics

The second law of thermodynamics states that no heat engine can have an efficiency of 100%, meaning it's impossible to convert all heat into work. It also states that heat flows spontaneously from hot to cold objects.

Isothermal Process in Carnot Cycle

An isothermal process in a Carnot cycle involves a constant temperature change, meaning there's no change in internal energy. This is achieved by allowing heat flow to compensate for work done or absorbed.

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Adiabatic Process in Carnot Cycle

An adiabatic process in a Carnot cycle occurs without heat transfer. All work done or absorbed affects the internal energy of the system, leading to a temperature change.

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