Question

Steam enters an adiabatic turbine at 1,000 psia and 900 F with a mass flow rate of 6 lbm/s and leaves at 5 psia. The isentropic efficiency of the turbine is 0.90. Neglect the kinetic and potential energy changes of the steam.

**What is the quality at the isentropic exit state, 2s
(X _{2s})?**

**What is the exit temperature of the steam
(T _{2})?**

**What is the power output of the turbine?**

Answer #1

NO INTERPOLATION REQUIRED
Air enters an adiabatic turbine at 1000 kPa and 1625 degrees C
(state 1) with a mass flow rate of 5 kg/s and leaves at 100 kPa the
isentropic efficiency of the turbine is 85%. Neglecting the kinetic
energy change of the steam, and considering variable specific
heats, determine:
a. the isentropic power of the turbine
Isentropic power in kW
b. the temperature at the turbine exit
temperature at exit in degrees C
c. the actual power...

Steam enters an adiabatic turbine at 1 MPa and 400 °C and leaves
at 150 kPa with a quality of 80 percent. Neglecting the changes in
kinetic and potential energies, determine the mass flow rate
required for a power output of 10 MW

Steam enters an adiabatic turbine at 5 Mpa 500 oC
with a mass flow rate of 2 kg/s and leaves at 100 kpa. The
isentropic efficiency of the turbine is 90%. Find (12
points)
(a) Actual work output of the turbine _______________ (7
points)
b) Maximum work output of the turbine_______________(3
points)
(c) Entropy change during this process
__________________________(2 points)

Question 5 Steam enters an adiabatic turbine at 10 MPa and 500°C
and leaves at 10 kPa with a quality of 90 percent. Neglecting the
changes in kinetic and potential energies, determine the mass flow
rate required for a power output of 5 MW

Steam enters an adiabatic turbine at 7 MPa, 700 °C and
80 m/s and leaves at 50 kPa, 150 °C, and 140 m/s. If the power
output of the turbine is 6 MW, determine:
i) Mass
flowrate of the steam flowing through the
turbine.
ii) The
isentropic efficiency of the turbine.

Steam enters an adiabatic turbine at 140 bar and 560 C and
leaves at 10 kPa. At the exit, the pressure and quality are 50 KPa
and .90, respectively. Determine the power produced (kW) by the
turbine if the mass flow rate is 1.63 kg/s.

Steam enters an adiabatic turbine at 5 MPa , 800 C and leaves
at 50 kPa, 150 C. Determine the isentropic efficiency of the
turbine
73%
10%
100%
96%

Consider an adiabatic turbine. At steady mass flow rate of 10
kg/s, steam enter the turbine at 4.5 MPa, 600°c and 85 m/s and
leaves the turbine at 40 kPa, quality of 0.8 and 50 m/s. Determine
:
a) the power output
b) the turbine inlet area

Helium gas enters an adiabatic nozzle at 35 psia and 820 degrees
R with an initial velocity of 10 ft/s. The helium leaves the nozzle
at 782 degrees R and 29 psia.
(a) What is the velocity of the helium at the nozzle's exit?
(ft/s)
(b) What is the isentropic efficiency of the nozzle? (%)
(c) What is the rate of entropy generation for this process?
(Btu/lbm R)

A turbine accepts steam at 4000kPa and 500oC and leaves at 100
kPa with a quality of 20%. If the mass flow rate is 6 kg/s
determine the power output. (Neglect kinetic & potential energy
changes. Neglect heat loss.)

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