Question

2 kilograms of steam at 2000 kpa and 270C undergoes a
reversible, adiabatic expansion to a final state at which the steam
is a saturated vapor.

A) Determine Temperature and pressure of the final state

B) Calculate Work, W for the expansion process

Answer #1

Question 1 Steam enters a nozzle at 300 kPa and 700ºC with a
velocity of 20 m/s. The nozzle exit pressure is 200 kPa. Assuming
this process is reversible and adiabatic, determine (a) the exit
temperature and (b) the exit velocity.

I'm having a little bit of difficulty with adiabatic reversible
expansions...Concerning this extended problem how do I go about
solving it?
Q:
Consider adiabatic reversible expansion of Neon gas under ideal
conditions at 75 kPa. Calculate the expected final state pressure
when the gas expands to 3/2 the volume of the initial state.
Moreover, consider adiabatic, reversible expansion of 0.10 mol
of carbon dioxide behaving as an ideal gas. Calculate the work done
by the gas when it expands to...

2.15 mol of an ideal gas with CV,m=3R/2
undergoes the transformations described in the following list from
an initial state described by T=350.K and
P=5.00bar.
1) The gas undergoes a reversible adiabatic expansion until the
final pressure is one-fourth its initial value.
2) The gas undergoes an adiabatic expansion against a constant
external pressure of 1.25 bar until the final pressure is
one-fourth its initial value.
3)The gas undergoes an expansion against a constant external
pressure of zero bar until...

Suppose 4.00 mol of an ideal gas undergoes a reversible
isothermal expansion from volume V1 to volume V2 = 8V1 at
temperature T = 300 K. Find (a) the work done by the gas and (b)
the entropy change of the gas. (c) If the expansion is reversible
and adiabatic instead of isothermal, what is the entropy change of
the gas?

An adiabatic counterflow heat exchanger receives 0.3
m3/s of saturated steam vapor at 200 kPa and condenses
it to a saturated liquid on the shell side. Water
enters the tubes at 25 C and leaves at 40 C. Determine
the second law efficiency for the heat exchanger.

2. p1V1γ= p2V2γ is only correct when (a) a perfect gas undergoes an
adiabatic process. (b) a
perfect gas undergoes a reversible process. (c) a perfect gas
undergoes a reversible adiabatic process.
(d) a real gas undergoes a reversible adiabatic
process.
4. If a simple (meaning one-component, single phase) and
homogeneous closed system undergoes an isobaric change with
expansion work only, how Gibbs free energy varies with
temperature? (a) (G/T)p>
0 (b) (G/T)p<
0 (c) (G/T)p=
0 (d) Depending on...

Consider the adiabatic, reversible expansion of a closed 1 mole
sample of monatomic ideal gas from P1 = 100 bar, V1 = 1dm3, and T1
= 1200K to V2 = 1.5 dm3.
What is the final temperature of the gas? What are the values of
ΔE, ΔS and w for the process described in the previous question? ΔE
= kJ ΔS = J/K w = kJ

A closed system containing R-134a initially at 280 kPa and 30 °C
undergoes a reversible isothermal process, after which its quality
is 0.40. (a) What is the specific heat and work transfer, q and w,
experienced by the system? (b) Sketch the process on a T-s diagram,
labeling the states and the isobars.

A mass of one kg of water within a piston–cylinder assembly
undergoes a constant-pressure process from saturated vapor at 500
kPa to a temperature of 260°C. Kinetic and potential energy effects
are negligible. For the water:
a) Evaluate the work, in kJ,
b) If the work is 30 kJ, evaluate the heat transfer, in kJ,
c) If the heat transfer is negligible, evaluate the entropy
production in kJ/K
d) Determine if the process is reversible, irreversible, or
impossible.

1 mole of a gas undergoes a mechanically reversible isothermal
expansion from an initial volume 1 liter to a final volume 10 liter
at 25oC. In the process, 2.3 kJ of heat is absorbed in the system
from the surrounding. The gas follows the following formula:
V=RTP+b where V is the molar specific volume, and Tand Pare
temperature (abosolute) and gas pressure respectively. Given R=
8.314 J/(mol.K) and b= 0.0005 m3. Evaluate the following a) Work
(include sign) b) Change...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 28 minutes ago

asked 34 minutes ago

asked 40 minutes ago

asked 44 minutes ago

asked 45 minutes ago

asked 50 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago