CONCEPTS AND FIRST LAW
Define Zeroth law of thermodynamics?
It states, “When two systems are in th
separately, then themselves are in thermal e
Define Thermodynamic Equilibrium?
A system is said to be in
thermodynamically equilibrium when there is no change in any macroscopic
property of the system. i.e. the temperature and pressure at all points should
be same, there should be no velocity gradient there should be no chemical
Define Extensive Property?
Extensive Property is the thermodynamic
properties depend upon the mass of the system. Example: Mass, Volume, Total
What is meant by quasi-static process in thermodynamics?
A system passes through an infinite
number of continuous equilibrium states and attains the original state when the
process is reversed. This process is called as quasi-static process. This
process follows a successive thermodynamic equilibrium process, thus it is
reversible process. It is very low process.
5.List the limitations
of First law of thermodynamics?
First law of thermodynamics does not
specify the direction of flow of heat and mass
The heat and work are mutually
is PMMI? Why it is impossible?
PMMI is the first temperature delivers
work continuously without any input. It violates first law of thermodynamics.
It is impossible to construct an engine working with this principle.
7. What is microscopic approach in
A matter consists of myriads of
molecules the properties of matter such as pressure, velocity, position and
energy of individual molecules.
It is the energy associated with the flow of mass
across the boundaries of a system
Energy = P x V (N-m)
between ‘Macroscopic energy’
Instead of studying parameters at molecular level,
the behavior of total system in terms of properties.
A matter consists of myriads of molecules, the
properties of matter such as pressure, velocity, position and energy etc.,
Differentiate between point
function and path function?
The quantity which is independent on the process or
path followed by the system.
Pressure, Volume, Temperature etc.,
The quantity dependent on the process or path
followed by the system.
Example: Heat transfer, work transfer etc.,
State the first law for a closed
system undergoing a process and a cycle?
first law of thermodynamics deals with this work and energy transfer and states
“in any cyclic process the net heat supplie the net
work done by the system on its surroundings”. i
Define the term Enthalpy?
The combination of internal energy and flow energy
is known as enthalpy.
H = U x PV (KJ)
What are the conditions for steady flow process?
In a steady flow process, the working
fluid enters the system and leaves to atmosphere after doing work. In this
system, both the energy and mass cross the boundary.
Example: Steady flow process applied to
various systems like boilers, turbine, compressor etc.
Why does free expansion have zero work transfer?
A fluid is allowed to expand suddenly
into a vacuum chamber through an orifice of large dimension, it is known as
15. Distinguish between the term State
and Process of thermodynamics?
It is condition of the system at an instant of Time
It is a fixed one
It occurs when the system undergoes a change
It is variable one
Explain PMM 1.
There can be no machine which would
continuously supply mechanical work without some other form of energy
disappearing simultaneously. Such a machine is called perpetual motion machine
of the first kind.
Name the different types of
Indicate the practical application
of steady flow energy equation.