Final Flashcards
Is mass constant in a closed system?
Yes Mass is constant
True or False. In steady state for an open system is Mass in equal to mass out?
True
True or False
Q (Heat transfer) +: in and -: out
True
True or False
W(Work done) +: out -:in
True
True or False
You can count out Heat transfer and work as well as potential energy when working with a nozzle or Diffuser
True
What is the formula to convert Celsius to Kelvin
K= C+273
What is formula to convert Fahrenheit to Celsius
F=1.8C+32
Is the formula for a refrigerator COPr or COPhp?
COPr
Is a formula for a heat pump COPr or COPhp
COPhp
What is entropy?
A thermodynamic quantity representing the unavailability of a systems thermal energy for conversion into mechanical work. Often interpreted as degree of disorder or randomness
Does entropy need heat transfer?
Yes it requires heat transfer
Does entropy change in an isentropic process?
No entropy stays the same
What does adiabatic mean?
It means no heat transfer
What does reversible mean?
Entropy generation is equal to zero
In an Isentropic turbine are you loosing or gaining pressure?
Loosing pressure
In an isentropic Compressor are you gaining or loosing pressure
You are gaining
If X destroyed is >0 is it an irreversible, Reversible it Impossible process
Irreversible Process
If X destroyed is =0 is it an irreversible, Reversible or Impossible process
Reversible process
If a destroyed is < 0 is it an irreversible, Reversible it Impossible process
Impossible process
What is the Conservation of mass principle
Mass like energy is a conserved property and it cannot be created or destroyed during a process.
What is flow work or flow energy?
The work of energy required to push the mass into or out of the control volume.
What is a steady flow process
A process during which fluid flows through a control volume steadily
What is a nozzle?
A nozzle is a device that increases the velocity of a fluid at the expense of pressure
What is a diffuser?
A device that increases the pressure of a fluid by slowing it down.
What is an Unsteady flow process
A process involved changes within the control volume with time
What is a resucito that supplies energy in the form of heat called?
It’s called a source
What is a reservoir that absorbs energy in the form of heat called
It’s called a sink
What is the Kelvin Planck Statement
It is impossible for any device that operates on a cycle to receive heat from a single reservoir and produce a net amount of work
What is the Clausius statement
It is impossible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a lower temperature body to a higher temperature body
What is a Perpetual motion machine
Any device that violates the first or second law
What is a Reversible Process
A process that can be reversed without leaving any trace on the surroundings
What is an irreversible process
A process that is not reversible
What is a Carnot Cucle
A cycle that is composed of four reversible processes, two isothermal and two adiabatic
