Mechanical - Engineering Thermodynamics - Basic Concepts And Definitions

**1.A turbine operating under steady flow
conditions receives steam at the following state: Pressure 13.8bar; Specific
volume 0.143 Internal energy 2590 KJ/Kg; Velocity 30m/s. The state of the steam
leaving the turbine is: Pressure 0.35bar; Specific Volume 4.37 Internal energy
2360KJ/Kg; Velocity 90m/s. Heat is lost to the surroundings at the rate of
0.25KJ/s. If the rate of steam flow is 0.38Kg/. What is the power developed by
the turbine.**

**2.Derive the steady flow energy equation
and reduce it for a turbine, pump, nozzle and a heat exchanger.**

**3.** **0.25kg of air at a pressure of 1 bar
occupies a volume of 0.3 . If this air expands isothermally to a volume of 0.9
. Find**

**i.
****The initial temperature **

**ii.
****Final temperature **

**iii.
****External work done **

**iv.
****Heat absorbed by the air **

**Change in internal energy. Assume R=0.29
KJ/Kg K.**

**1.5kg of certain
gas at a pressure of 8 bar and 20°C occupies the volume of 0.5 . It expands
adiabatically to a pressure of 0.9 bar and volume 0.73 . Determine the work
done during the process. Gas constant, ratio of specific heat, values of two
specific heats, change in internal energy and change in enthalpy.**

**5.
****A cylinder contains 1 of gas at
100kpa and 100°C, the gas is polytropically compressed to a volume of 0.25 .
The final pressure is 100kpa. Determine **

**a.
****Mass of the gas **

**b.
****The value
of index ‘n’
for compression **

**c.
****Change in internal energy of the
gas **

**d.
****Heat transferred by the gas during
compression. Assume R = 0.287KJ/Kg K; γ= 1.4. **

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