Question

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1. A refrigerator has a cooling liquid. Describe the stages and how energy is added or released at each stage in relationship to the 2^nd law of thermodynamics.

2. You are familiar with the laws of thermodynamics in form and description. Relate any one to the process of an air-conditioning unit in a house

3. A vertical hydraulic cylinder has a piston with a diameter of 23mm, if the ambient pressure is 70 kPa, determine the mass (N) of the piston if the internal pressure is 0.3MPa.

4. Air flows through a pipe of 60cm diameter with a velocity of 0.7 m/s. If the specific volume of the air is 0.1 m³/kg determine:

The flow (m³/s)

Mass flow (kg/s)

5. Pressure in a piston system is at 120 kPa and a volume of 0.5m³ if the volume is increased to 0.75m³ what is the new pressure?

6. A volume of 0.25 m³ at a temperature of 125⁰C and pressure at 80kPa has the temperature increased by 200K. What is the new volume?

7. Explain the chemistry that occurs when a fuel is burnt and relate to all the laws of Thermodynamics.

Answer 1