Lecture 4

What does the second law of thermodynamics state about heat flow?

• Heat cannot flow spontaneously from cold to hot.

• Heat can only flow in a closed system.

• Heat can flow spontaneously from cold to hot.

• Heat flows without the need for work.

Who described the operating principle of an ideal heat engine mathematically?

• Isaac Newton

• Sadi Carnot

• Albert Einstein

• James Clerk Maxwell

What is a heat pump primarily used for?

• To cool the air only.

• To generate electricity.

• To heat a space.

• To transfer heat from a high temperature to a low temperature.

In the reversed Carnot cycle, what is the function of a Carnot refrigerator?

• To cool the refrigerant.

• To convert work into heat.

• To move heat from a colder area to a warmer one.

• To generate electricity.

What is the purpose of the throttling valve in a refrigeration cycle?

• To maintain a pressure differential.

• To cool the refrigerant.

• To heat the refrigerant.

• To increase the pressure of the refrigerant.

What does COP stand for in refrigeration systems?

• Coefficient of Performance

• Control of Pressure

• Constant Operating Pressure

• Cooling Output Power

Which of the following is a type of refrigeration system?

• Solar Refrigeration System

• Chemical Refrigeration System

• Thermal Expansion System

• Mechanical-Compression Refrigeration System

What is the main function of a chiller in a central plant?

• To filter air.

• To heat water.

• To cool the chilled water.

• To distribute air.

What is the primary role of an air handling unit (AHU)?

• To store heat.

• To generate electricity.

• To condition and distribute air.

• To cool the refrigerant.

What is the purpose of sound control in air conditioning systems?

• To increase airflow.

• To enhance cooling efficiency.

• To improve air quality.

• To reduce noise levels.