Thermodynamics Flashcards
Which law is the basis for the manufacture of thermometers?
Zeroth Law of Thermodynamics
Energy is added to the water as work but is extracted from the water
as heat was performed by
Joule
These properties depend on the current state of the system and not
on how the system reaches that state.
state functions
Which of the following statement is correct?
Q + W is a state function
The amount of heat absorbed when CO2 gas reacts with a solid CaO
to form solid CaCO3 is measured in a bomb calorimeter at constant
volume. The data obtained give a direct measure of
delta U
For a constant pressure reversible process, the enthalpy (∆H)
change of the system is
Integral of Cp dT
Cv is given b
(dU/dT)v
Equation which relates pressure, volume, and temperature of a
gas is called
Equation of state
The equation, PV = nRT is best obeyed by gases at
low pressure and high temperature
Compressibility factor of a gas is
unity, if it follows PV = nRT
Cp – Cv = R is valid for
ideal gases
For monoatomic gases, Cp / Cv equals
1.67
Isobaric process means a constant
pressure process
For an isothermal process the internal energy of a gas
remains unchanged
In an adiabatic process
heat transfer is zero
From PVn = C, when n = 0, the process is
Isobaric
From PVn = C, the process is isochoric if n equals
infinity
A solid is transformed into vapor without going through the liquid
phase at
triple point or below triple point
An inventor claims to have a cyclic engine which exchanges heat
with reservoirs at 250C and 2500C, and which produces 0.45 kJ
of work for each kJ of heat extracted from the hot reservoir. Is the
claim believable?
no
An inventor has devised a complicated non-flow process in which
1 mol of air is the working fluid. The net effects of the process are
claimed to be:
- A change in state of the air from 2500C and 3 bar to 800C and 1
bar.
- The production of 1800 J of work.
- The transfer of an undisclosed amount of heat to a heat reservoir
at 300C.
Determine whether the claimed performance of the process is
consistent with the second law. Assume that air is an ideal gas
for which Cp = (7/2)R
Yes
Work output of turbine is __ the work input to the pump
greater than
The efficiency of Carnot cycle is ___ the efficiency of Rankine
cycle
greater than
The losses in condenser are
small
0th law of thermodynamics
Ralph Howard Fowler
2nd law of thermodynamics
Kelvin Planck
1st law of thermodynamics
Rudolf Clausius
How many intensive variables must be specified to fully describe a system containing mixture of water, liquid benzene and nitrogen.
2
Actual work delivered divided by the corresponding ideal work is known as ________ efficiency.
turbine
Heat capacity is defined as C = dQ/dT, what is the difficulty about the relationship of C to Q which are supposedly state functions?
It is a process-dependent quantity
Which of the following gives the most work we can get out of an adiabatic system?
Irreversible compression
Irreversible expansion
Reversible compression
Reversible expansion
Reversible expansion
What happens to delta U when work is done by the system during the adiabatic expansion of ideal gas?
0
