Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 4th Semester (Fourth Semester) 2016-17 Chemical Engineering Thermodynamics I Question Paper
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B.TECH.
THEORY EXAMINATION (SEM?IV) 2016-17
CHEMICAL ENGINEERING THERMODYNAMICS-I
.' 3 Hours Max. Marks .' 100
Note : Be precise in your answer. In case ofnumerical problem assume data wherever not provided.
*F'P?vweeep?er
SECTION A
Attempt all questions of the following (10 x 2 = 20)
State the second law of thermodynamics.
What is volume expansivity?
What is meant by heat engine?
Explain the limitations of first law of thermodynamics
Derive an expression for expanding agas.
Define the term COP.
Define J oule ? Thomson Co-ef?cient
What is Third Law of Thermodynamics?
What is meant by thermodynamic property?
What is meant by closed system? Give an example.
SECTION B
Attempt any ?ve of the following (10 x 5 = 50)
220 kg of C02 gas at 27?C and 1 atm is compressed adiabatically to 1/5th of its volume. It is
then cooled to its original temperature at constant volume. Find Q, AU and W for each step.
What is critical point? Draw and discuss P?V diagram.
Show that the fugacity of a gas obeying the equation of state p(V ? B) = RT, is given by
f: p e13p/ RT
Derive fundamental property relation. Also list the four Maxwell?s relations.
A heat engine operates between a source a 600 ?c and a sink at 6000 Determine the
least rate of heat rejection per KW net output of the engine.
Derive
dH=CPdT+ V?T K d?
a? P
Derive a relation for entropy change for adiabatic mixing.
A steel castng at a temperature 725K and weighing 35 Kg is quenched in 150Kg oil
at 275 K. if there are no heat losses, determine the change in entropy. The specific heat of steel
is 0.88 KJ/Kg K and that of an oil is 2.5 KJ/Kg K.
One gram mole of a perfect gas with Cp = 7 cal/gmol.?K is to be expanded from 10 atm and
500 K to 1 atm and 300 K by two reversible paths.
i. C001 at 10 atm from 500 K to 300 K and expand isothermally to 1 atm at 300 K.
ii. Expand at 500 K to the final volume and cool at constant volume to 300 K.
iii. What is the change in entropy for the gas over each path?
SECTION C
Attempt any two of the following (15 x 2 = 30)
3.
A turbine operates under steady ?ow condition receives steam at the following:
State pressure = 1.2Mpa, Temperature =1880C, Enthalpy = 2785 kJ/kg, velocity = 33.3m/sec
and elevation = 3m. The steam leaves the turbine at the following state:
Pressure = 20Kpa, Enthalpy = 2512 kJ/kg, velocity = 100m/sec and elevation = 0m.
Heat is lost to the surrounding at the rate of 0.29kJ/sec. If the rate steam ?ow to the turbine is
0.42kg/sec, what is the power output of the turbine in KW.
4. Explain in detail with the help of P?V diagram the work required in the case of Isothermal and
Adiabatic process.
5. What does Gibbs?Duhem equation relate? Derive various forms of Gibbs?Duhem equation.
This post was last modified on 29 January 2020