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Questions and Answers
Which of the following is the most efficient thermodynamic cycle?
Which of the following is the most efficient thermodynamic cycle?
- Carnot (correct)
- Brayton
- Diesel
- Otto
Enthalpy of an ideal gas is a function only of ____________.
Enthalpy of an ideal gas is a function only of ____________.
temperature
What is the first law of thermodynamics?
What is the first law of thermodynamics?
- Heat energy cannot be completely transformed into work
- Internal energy is due to molecular motions
- Entropy of the universe is increased by irreversible processes
- Energy can neither be created nor destroyed (correct)
An ideal gas is compressed isothermally. What is the enthalpy change?
An ideal gas is compressed isothermally. What is the enthalpy change?
Name the process that has no heat transfer.
Name the process that has no heat transfer.
An ideal gas is compressed in a cylinder so well insulated that there is essentially no heat transfer. The temperature of the gas:
An ideal gas is compressed in a cylinder so well insulated that there is essentially no heat transfer. The temperature of the gas:
What is the SI unit of pressure?
What is the SI unit of pressure?
The equation $C_p = C_v + R$ applies to which of the following?
The equation $C_p = C_v + R$ applies to which of the following?
In the flow processes, neglecting kinetic and potential energies, the integral of $Vdp$ represents what?
In the flow processes, neglecting kinetic and potential energies, the integral of $Vdp$ represents what?
Mechanical energy of pressure transformed into energy of heat.
Mechanical energy of pressure transformed into energy of heat.
The theory of changing heat into mechanical work.
The theory of changing heat into mechanical work.
Average pressure on a surface when a changing pressure condition exists.
Average pressure on a surface when a changing pressure condition exists.
Which of the following cycles consists of two isothermal and two constant volume processes?
Which of the following cycles consists of two isothermal and two constant volume processes?
A control volume refers to what?
A control volume refers to what?
In the polytropic process, $Pv^n = constant$, if the value of n is infinitely large, the process is
In the polytropic process, $Pv^n = constant$, if the value of n is infinitely large, the process is
If the temperature is held constant and the pressure is increased beyond the saturation pressure, then the working medium must be:
If the temperature is held constant and the pressure is increased beyond the saturation pressure, then the working medium must be:
Number of molecules in a mole of any substance is constant called ______________.
Number of molecules in a mole of any substance is constant called ______________.
Is one whose temperature is below the saturation temperature corresponding to its pressure:
Is one whose temperature is below the saturation temperature corresponding to its pressure:
If the pressure of a gas is constant, the volume is directly proportional to the absolute temperature.
If the pressure of a gas is constant, the volume is directly proportional to the absolute temperature.
The number of protons in the nucleus of an atom or the number of electrons in the orbit of an atom.
The number of protons in the nucleus of an atom or the number of electrons in the orbit of an atom.
In a P-T diagram of a pure substance, the curve separating the solid phase from the liquid phase is:
In a P-T diagram of a pure substance, the curve separating the solid phase from the liquid phase is:
A water temperature of 18°F in the water cooled condenser is equivalent in °C to _________
A water temperature of 18°F in the water cooled condenser is equivalent in °C to _________
The latent heat of vaporization in Joules per kg is equal to __________.
The latent heat of vaporization in Joules per kg is equal to __________.
Form of energy associated with the kinetic energy of the random motion of a large number of molecules.
Form of energy associated with the kinetic energy of the random motion of a large number of molecules.
If the temperature is held constant and the pressure is increased beyond the saturation pressure, then, the working medium must be:
If the temperature is held constant and the pressure is increased beyond the saturation pressure, then, the working medium must be:
Is the condition of pressure and temperature at which liquid and its vapor are indistinguishable.
Is the condition of pressure and temperature at which liquid and its vapor are indistinguishable.
When a substance in gaseous state is below the critical temperature, it is called ______________.
When a substance in gaseous state is below the critical temperature, it is called ______________.
Superheated vapor behaves:
Superheated vapor behaves:
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Study Notes
Thermodynamics
- The enthalpy of an ideal gas is dependent only on temperature.
- The Carnot cycle is the most efficient thermodynamic cycle.
- The first law of thermodynamics states that energy cannot be created or destroyed, only transformed.
- The enthalpy change for an ideal gas compressed isothermally is zero.
- An adiabatic process is one with no heat transfer.
- An ideal gas compressed adiabatically will experience an increase in temperature.
- The SI unit of pressure is the Pascal.
- The equation Cp = Cv + R applies to ideal gases.
- In flow processes, neglecting kinetic and potential energies, the integral of Vdp represents shaft work.
- Enthalpy is the mechanical energy of pressure transformed into heat energy.
- Thermodynamics is the study of heat energy and its transformation into mechanical work.
- Mean effective pressure is the average pressure on a surface when a changing pressure condition exists.
- The Stirling cycle consists of two isothermal and two constant volume processes.
- A control volume refers to a fixed region in space.
- In a polytropic process, Pv^n = constant, if n is infinitely large the process is isometric (constant volume).
- A compressed liquid exists when the temperature is held constant and the pressure is increased beyond the saturation pressure.
- A subcooled liquid is below the saturation temperature corresponding to its pressure.
- Avogadro's number is the constant number of molecules in one mole of any substance.
- Charles' law states that at constant pressure, the volume of a gas is directly proportional to its absolute temperature.
- An atom's atomic number refers to the number of protons in its nucleus or the number of electrons in its orbit.
- The fusion curve on a P-T diagram separates the solid and liquid phases of a pure substance.
- 18°F is equivalent to 10°C.
- The latent heat of vaporization of water is 22.6 x 10^5 J/kg.
- Heat is a form of energy associated with the kinetic energy of random molecular motion.
- The critical point is the pressure and temperature condition at which a liquid and its vapor are indistinguishable.
- A vapor is a substance in a gaseous state below its critical temperature.
- Superheated vapor behaves approximately as a gas.
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