(b) 1.5 kg of liquid having a constant specific heat of 2.5 kJ/kg°C is stirred in a well-insulated chamber causing the temperature to rise by 15°C. Find: (i) Change in internal energy, and (ii) Work done for the process.
(b) 1.5 kg of liquid having a constant specific heat of 2.5 kJ/kg°C is stirred
in a well-insulated chamber causing the temperature to rise by 15°C. Find:
(i) Change in internal energy, and
(ii) Work done for the process.
(c) 85 kJ of heat are supplied to a system at constant volume. The system
rejects 90 kJ of heat at constant pressure and 20 kJ of work is done on it.
The system is brought to its original state by adiabatic process.
(i) Determine the adiabatic work.
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(ii) Determine also the value of internal energy at all end states if initial
value
is 100 kJ.
(d) A turbine operating under steady flow conditions receives steam at the
following state: pressure 13.8 bar; specific volume 0.143 m 3 /kg; internal
energy 2590 kJ/kg; velocity 30 m/s. The state of the steam leaving the
turbine is: pressure 0.35 bar; specific volume 4.37 m 3 /kg; internal energy
2360
kJ/kg; velocity 90 m/s. Heat is lost to the surroundings at the rate of 0.25
kJ/s. If the rate of steam flow is 0.38 kg/s, what is the power developed by
the turbine?
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