During condensation, which type
of heat is released
Ans:
Latent heat of
vaporization
What is a Isochoric process
Ans : Constant Volume (Process that takes
place at constant volume)
During sensible
cooling of moist air, what happens to its relative humidity
Ans: Increases
At critical point,
what is the enthalpy of vaporization is
Ans: Zero
What is conduction, convection and radiation? Give
Examples?
Ans:-
Conduction - The transfer of energy between objects that
are in physical contact
Convection - The transfer of energy between an object and
its environment, due to circular fluid motion
Radiation - The transfer of energy to or from a body by
means of the emission or absorption of electromagnetic radiation
Can you transfer the heat energy from cold body to
hot body?
- Yes, with external work. Eg : Air conditioner
What is priming?
Ans:- Pump casing must be filled with liquid before the pump is started, or
the pump will not be able to function. If the pump casing becomes filled with
vapors or gases, the pump impeller becomes gas-bound and incapable of pumping.
What is yield point?
The yield strength or yield point is the stress at which a material begins to deform
plastically.
During rainy season even though thunder occurs
first followed by lightning; why do we see lightning first and then hear the
thunder?
- Light travels faster than sound
What is viscosity?
Viscosity is a measure of the resistance of a fluid which is being deformed
by either shear stress or tensile stress.
What is unit of specific gravity?
A – Dimensionless (No Unit) because it is a ratio of density to density
Zeroth law of
thermodynamics:
If two
systems are in thermal equilibrium with a
third system, then the two systems are also in thermal equilibrium with each
other.
What happens to the specific volume of water when heated from 00C
Ans: first
decreases and then increases
What is the meaning of Entropy
Entropy may
be understood as a measure of disorder within a macroscopic system.
The second
law of thermodynamics states that an isolated
system's entropy never decreases. Such systems spontaneously evolve
owards thermodynamic equilibrium, the state with maximum entropy.
What is a Steady
state process:
Ans: A process that occurs without a change in
the internal energy
What
is a specific heat?
The specific
heat is the amount of heat required per unit mass to
raise the temperature by one degree Celsius.
Name 3 units of Energy
Joules,
Kilo Watt Hour, British Thermal Unit (BTU), Calories, Tons of Oil Equivalent,
Electron Volt, Foot-Pound
Name some forms of Energy
Kinetic,
Potential, Mechanical,
Electric,
Magnetic,
Gravitational, Chemical,
Ionization, Nuclear, Chromodynamics, Elastic,
Mechanical
wave, Sound wave, Radiant,
Thermal
What is the difference between complete and incomplete combustion
Ans:-
Incomplete combustion occurs due to insufficient oxygen. In complete
combustion, carbon
dioxide is the only product that includes carbon whereas, in
incomplete combustion, carbon
monoxide and carbon dust are formed as products.
What
are the products of a complete combustion?
During
complete combustion carbon and hydrogen combine
with oxygen (O2) toproduce carbon dioxide (CO2)
and water (H2O). During incomplete combustion part of the carbon is
not completely oxidized producing soot or carbon
monoxide(CO).
What
is the difference between Absorption and Adsorption
Absorption is
the process in which a fluid is dissolved by a liquid or a solid
(absorbent). Adsorption is the process in which atoms, ions or
molecules from a substance (it could be gas, liquid or dissolved solid) adhere
to a surface of the adsorbent.
What
is a Catalyst:-
a substance
that increases the rate of a chemical reaction without itself undergoing any
permanent chemical change.
What
is a Reynolds Number
The Reynolds
number is a dimensionless value that measures the ratio of inertial
forces to viscous forces and descibes the degree of laminar or turbulent flow.
What is In Bernoulli's principle in fluid
dynamics,
Bernoulli's
principle states that an increase in the speed of a fluid occurs siimultaneously
with a decrease in pressure or a decrease in the fluid's potential
energy
What is sublimation
A process
change in which a substance changes from a solid to a gas without ever passing
through a liquid phase.
What
is heat capacity
The heat
capacity of a substance indicates the ease with which a substance heats up.
A good thermal conductor would
have a low heat capacity, indicating
that a small amount of energy causes a large temperature change. A good thermal
insulator would have a large heat capacity, indicating that much energy
transfer is needed for a temperature change.
What
is Mechanical Equilibrium
Mechanical
equilibrium: when there is no change in pressure at any point of the system.
However, the pressure may vary within the system due to gravitational effects.
What
is Thermal Equilibrium
Thermal
equilibrium: when the temperature is the same throughout the entire system.
What are intensive properties of a system with respect to
Thermodynamics.
Intensive
properties: are those that are independent of the size (mass) of a system, such
as temperature, pressure, and density. They are not additive.
The kinematic
viscosity is the ratio of
absolute viscosity to the density of the
liquid
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