26 Questions
What is Cv related to in thermodynamics?
Changes in internal energy
What is C related to in thermodynamics?
Changes in enthalpy
What is the unit of measurement for specific heat capacity?
kJ/kg.K
Is the unit of measurement for specific heat capacity the same in Celsius and Kelvin?
Yes, because they are interchangeable
What is the significance of specific heat capacity in thermodynamics?
It determines the amount of energy required to change the temperature
What is the unit of the term 'ds' in the given equation?
Joules per kilogram kelvin
What is the characteristic of a quasi-equilibrium process?
The system remains nearly in equilibrium at all times
What is the relation between 'P' and 'PdV' in the given equation?
P is proportional to PdV
What is the unit of 'W' in the equation?
Joules per second
What does the equation 'SWF ds = PA ds = PdV' represent?
The energy balance of a system
What is a substance with a fixed chemical composition throughout?
Pure substance
Why is air considered a pure substance despite being a mixture of several gases?
Because it has a fixed chemical composition
What is a saturated vapor?
A vapor that is about to condense
What happens to the temperature of water during the phase-change process between states 1 and 5?
The temperature remains constant at 100°C
What occurs when the entire process between states 1 and 5 is reversed by cooling the water while maintaining the pressure constant?
The water will go back to state 1, retracing the same path
What is true about the amount of heat released during the reversed process?
The amount of heat released exactly matches the amount of heat added
What is the physical significance of the area under the process curve on a P-V diagram for a closed system?
It is equal in magnitude to the work done during a quasi-equilibrium expansion or compression process
What is the mathematical relationship between the area of the process curve and the work done on a closed system?
Area = PdV
What is the condition for a process to occur in a closed system, as depicted on a P-V diagram?
The process must be quasi-equilibrium
Which of the following is a correct unit for the area under the process curve on a P-V diagram?
Joules
What is the relationship between the path 'dA' and the pressure 'P' and volume change 'dV'?
dA = PdV
What is the relationship between internal energy and temperature for an ideal gas?
u is a function of T
What is the expression for enthalpy h in terms of internal energy u and gas constant R?
h = u + RT
What is the relationship between the change in internal energy and the specific heat capacity at constant volume?
du = c₁ dT
What is the relationship between the change in enthalpy and the specific heat capacity?
dh = c dT
What was the purpose of the experimental apparatus used by Joule, as shown in the schematic?
To measure the mechanical equivalent of heat
Test your understanding of thermodynamic properties, including specific heat capacity and enthalpy changes. This quiz covers the relationships between internal energy, enthalpy, and temperature changes. Evaluate your knowledge of thermodynamic concepts and units.
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