1. Steam with a specific volume of 0.
09596 m3/kg undergoes
a constant pressure process at 1.70 MPa until the specific
volume becomes 0.13796 m3/kg. What are (a) the final
temperature 265.4, (b) ∆u 430.7, (c) W 71.4, (d) ∆s 1.0327,
and (e) Q 502.1?
2. Steam with an enthalpy of 2843.5 kJ/kg undergoes a
constant pressure process at 0.9 MPa until the enthalpy
becomes 2056.1 kJ/kg. What are (a) the initial temperature
or quality 204.2 , (b) ∆u -703.2, (c) W -84.15, (d) ∆s
1.73505, and (e) Q -787.4?
3. One kg of steam at 260oC and with an enthalpy of 1861
kJ/kg is confined in a rigid container. Heat is applied until
the steam becomes saturated. Determine (a) Q 779.9 , (b)
∆h 872.4, (c) ∆s 1.398, and (d) the final temperature 307.4.
4. One kg of steam at 121oC and 10% moisture undergoes a
constant volume process until the pressure becomes 0.28
MPa. Determine (a) the final temperature 206.5 and (b) Q.
344(c) At what pressure was the final condition saturated?
0.229 Mpa
5. A 0.50 m3 tank contains saturated steam at 300 kPa. Heat
is transferred until the pressure reaches 100 kPa.
Determine (a) the heat transferred, (b) the final
temperature, and (c) the final steam quality.
6. To what temperature must a rigid tank containing dry
saturated steam at 127oC be cooled to yield a mixture 0f
25% quality?
7. There are 2.27 kg/min of steam undergoing an isothermal
process from 27.5 bar, 316oC to 6.8 bar. Determine (a) ∆S,
(b) Q, (c) W for nonflow, and (d) for steady flow with ∆P=0,
∆K=42 kJ/min.
8. Steam at 200oC and with an entropy of 5.6105 kJ/kg-K
expands isothermally to 0.515 MPa. For 5 kg (a) what are
∆S, ∆H, and ∆U? Determine Q and W (b) for nonflow
process, (c) for steady flow process with ∆K=0.
9. One kg of steam expands isentropically from 2.1 MPa and
374oC to 93oC. Find the quality and the work for nonflow
and steady flow processes.
10. Steam flows isentropically through a nozzle from 1500
kPa, 288oC to 960 kPa. For 454 g/s determine (a) t2, (b) ∆V,
(c) W, and (d) ∆K.
11. A steam turbine receives 0.52 MPa of steam at 300oC,
then expand in an irreversible adiabatic process to a
pressure of 0.012 MPa. If the exhaust steam is dry and
saturated, calculate (a) the work of an irreversible process
and (b) the efficiency of the process.
12. Expand 2 kg of steam at 15 bar, 300oC, into the wet
region to 100oC in a polytropic process where pV1.21 = C.
Determine (a) y2, (b) ∆H, (c) ∆S, (d) nonflow and steady
flow work, and (e) Q.
13. Five kg per second of steam at 5.9 MPa and 500oC
expand to 0.9 MPa in a polytropic process where pV1.26 = C.
Find (a) x2 or t2, ∆H, ∆U, ∆S, (b) W for nonflow, and (c) W
for steady flow if ∆K = -40 kJ/s. (d) Find Q from steady flow
and also from nonflow energy equation.
14. Steam at 1.4 MPa and 270oC flows steadily through a
steam throttle valve that reduces its pressure by 50%. Find
(a) the final temperature and (b) the change in entropy.
15. A throttling calorimeter receives steam from a boiler
drum at 0.11 MPa and is superheated by 10 degrees. If the
boiler drum pressure is 1.55 MPa, what is the quality of the
steam generated by the boiler?
16. A stream calorimeter receives steam from a pipe at 0.1
MPa and 20oSH. For a pipe steam pressure of 2 MPa, what
is the quality of the steam?
