DC -- Carnot engine

According to the 2nd law of thermodynamics, a heat engine cannot be 100% efficient. Why?

• the adiabatic step is not reversible

• the isothermal process is not reversible

• some heat is transferred to the environment

• not enough power is generated

Tags

NGSS.HS-PS3-4

The 2nd Law of Thermodynamics can be restated in terms of ---

• the Carnot Cycle

• Entropy

• Heat transfer

• Kinetic energy

Tags

NGSS.HS-PS3-4

What does this diagram show?

• a non-reversible isothermal process

• a pressure-volume diagram for the Carnot Cycle

• a pressure-volume diagram for any Ideal Gas

• a non-reversible adiabatic process

Why is the ideal Carnot engine unrealistic for any application?

• It has a low efficiency

• It requires a large amount of energy

• It has zero power

• It releases too much power

Tags

NGSS.HS-PS3-4

According to Carnot's discoveries, in the perfect heat engine, Q_c/Q_h = ?

• Pc / Ph

• 1

• T_c / T_h

• W

What does this diagram represent?

• a turbine generator

• a pressure containment structure

• a steam generator

• a pressurized water nuclear reactor

Tags

NGSS.HS-PS3-4

What unit must all temperature values be converted to when solving Carnot engine efficiency problems?

• Kelvin

• Fahrenheit

• Celsius

• Rankine

The diagram shows energy transfer in a real heat engine. What does the W_f represent?

• work done against friction

• work transferred to the isothermal process

• the final quantity of work in the system

• the heat transferred by energy input

Tags

NGSS.HS-PS3-4