PS(12/04/24): (2) Thermodynamic Application

What is a heat engine?

• A system that converts mechanical work into heat energy.

• A system that converts heat energy into mechanical work.

• A system that stores heat energy.

• A system that cools down mechanical parts.

What is the formula for efficiency (η) in a heat engine?

• η = Q_in/W

• η = W/Q_out

• η = W/Q_in

• η = Q_out/W

Which of the following is an application of steam turbines?

• Powering vehicles

• Generating electricity in power plants

• Cooling engines

• Heating buildings

What drives pistons in car engines?

• Steam energy

• Combustion of fuel

• Electrical energy

• Solar power

Diagram of the Carnot Cycle showing isothermal and adiabatic processes.

• Isothermal expansion and compression

• Adiabatic expansion and compression

• Isobaric expansion and compression

• Isochoric expansion and compression

Why is increasing efficiency in engines important for environmental sustainability?

• It reduces fuel consumption and emissions.

• It increases the size of the engine.

• It makes engines louder.

• It decreases the lifespan of the engine.

Why is increasing efficiency in engines important for environmental sustainability?

• It increases fuel consumption and waste heat.

• It reduces fuel consumption and lowers harmful emissions.

• It has no impact on environmental sustainability.

• It only benefits the engine manufacturers.

What happens to entropy as temperature approaches absolute zero?

• It increases to a maximum value.

• It remains constant.

• It approaches a minimum value.

• It becomes infinite.

What is the theoretical temperature of absolute zero in Celsius?

• 0°C

• -100°C

• -273.15°C

• -459.67°C

Which of the following is an application of the third law of thermodynamics?

• Solar energy

• Cryogenics

• Wind power

• Hydroelectricity