18 Questions
What is the measure of the capability of a substance to dissipate power once its stored energy is utilized?
Energy
What is the energy stored in a moving body?
Kinetic Energy (KE)
Explain the temperature relation between Fahrenheit and Celsius.
Fahrenheit to Celsius
What is the pressure reading below atmospheric pressure or 'zero'?
Vacuum Pressure (𝑃𝑣𝑎𝑐)
What is the absolute zero pressure also known as?
Perfect Vacuum
What is the energy that a system possesses due to its elevation above some arbitrarily selected datum?
Potential Energy (PE)
What is the importance of finding the initial value of internal energy when the unknown is the internal energy of the body?
To have a reference at absolute zero temperature where internal energy is almost zero.
When the unknown is the flow work, why should we consider the absolute value of pressure?
We are in reference with absolute zero pressure/vacuum pressure where the flow work is zero.
Describe the flow of heat energy in a thermodynamic system.
Heat energy flows from a higher potential body to a lower potential body.
What types of devices are classified as steady-flow devices?
Turbines, compressors, and nozzles.
Explain what is meant by steady-flow process.
A process during which a fluid flows through a control volume steadily.
What is the key requirement for energy analysis of steady-flow systems?
Fluid properties at an inlet or exit must remain constant.
Define entropy.
Measure of randomness of the molecules of a substance or measure the fraction of the total energy of a system that is not available for doing work.
What does conservation of mass state?
The mass of a body is constant during its motion.
What is mass flow rate?
The amount of mass flowing per unit time.
Explain compressible flow system.
It means that the working substance passing through a thermodynamic system is subject to a change of bulkiness due to compression during steady flow processes.
What is conservation of energy also known as?
First Law of Thermodynamics/Conservation of Energy Principle.
What is the purpose of an energy balance or balanced energy equation?
To determine the required parameters such as energy, heat transferred, and work done by/on the system.
Test your knowledge on vacuum pressure, absolute zero pressure, temperature measurement, and temperature conversion relationships like Fahrenheit to Celsius. Explore concepts like perfect vacuum, thermometers, pyrometers, and the assumptions at absolute zero in thermo processes.
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