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Posted Date: 30 Oct 2008 Posted By: Rajesh Member Level: Diamond
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2008 Jawaharlal Nehru Technological University Chemical engineering CHEMICAL ENGINEERING THERMODYNAMICS-I II B.Tech Supplimentary Examinations, Aug/Sep 2008 Question paper
Code No: R05220802 Set No. 2
II B.Tech Supplimentary Examinations, Aug/Sep 2008
CHEMICAL ENGINEERING THERMODYNAMICS-I
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) LPG, which is predominantly propane is used as cooking gas. If a cylinder is
filled with 14.7 kg of LPG, determine the mol number of gas in the cylinder.
(b) A gas mixture has the following molar composition: CO2-20mol%; CO-20mol%;
O2-55mol% and N2 -5mol%. Determine the mass in kg of 75 mol of this mix-
ture. [8+8]
2. A fluid is confined in a cylinder by a spring loaded, frictionless piston, so that the
pressure in the fluid is a linear function of the volume (p = a+b V). The internal
energy of the fluid is given by the following equation,
U = 34+3.15 pV,
Where U is in kJ, p in kPa and V in cubic metre. If the fluid changes from an
initial state of 170 kPa, 0.03m3 to a final state of 400 kPa, 0.06m3; with no work
other than that done on the piston, find the direction and magnitude of the work
and heat transfer. [16]
3. (a) What is ideal gas? Name the two basic assumptions, which were made use of
in deriving the ideal gas equation of state from kinetic theory arguments.
(b) Define isothermal compressibility and coefficient of volume expansion. [10+6]
4. Steam at 0.5MPa and 2030 C enters a nozzle with a velocity of 1m/s at the rate of
1kg/s and leaves as dry saturated steam at 0.1MPa. The energy loss as heat from
the nozzle is 10.1kJ/s. Calculate the exit velocity of steam. [16]
5. A reversible engine operating between a reservoir at 590K and the ambient at-
mosphere at 303K drives a refrigerator operating between 250K and the ambient
atmosphere. Determine the ratio of energy rejected by both the devices to the
ambient atmosphere to the energy absorbed by the engine from the reservoir at
590K. [16]
6. Discuss the mathematical statement of second law of thermodynamics. What are
its conclusions? [16]
7. (a) Mention a few common refrigerants.
(b) What are different methods for the liquefaction of gases? Discuss any one of
them. [6+10]
8. Suppose one kmol of an ideal gas is available at 1MPa and at ambient temperature
of 302K. If the gas is allowed to expand to 0.12 MPa, while in contact with the
ambient atmosphere and the final temperature of the gas is same as the ambient
temperature, calculate the maximum work that can be obtained from the gas.
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