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Posted By: murali Member Level: Silver Posted Date: 30 Apr 2008
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2007 Jawaharlal Nehru Technological University B.E Chemical PROCESS HEAT TRANSFER SET NO 1 Question paper
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II B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007
CHEMICAL ENGINEERING THERMODYNAMICS-I
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Define gauge pressure and absolute pressure.
(b) The pressure of a gas in a pipe line is measured with a mercury manometer
having one limb open to the atmosphere. If the difference in the height of
mercury in the two limbs is 562 mm, calculate the gas pressure. The barometer
reads 761 mm Hg, the acceleration due to gravity is 9.79m/s
2, and the density
of mercury is 13,640 kg/m
3. [6+10]
2. A system is taken from state 1 to state 2 along a path A. During this process it
received 200 kJ energy as heat and does 100 kJ work. If the system is taken from
state 2 to state 1 by a different path B, it is necessary to spend 150 kJ work on
the system. Determine the heat interaction along the path B. Suppose the system
is restored to state 1 from state 2 by an adiabatic path C, how much work has to
the done on the system? [16]
3. Find the density of chlorine gas at 155 bar and 521K, using the compressibility
factor chart. Data M.W = 70.91, w = 0.090, Tc = 417K, Pc = 77.1bar. [16]
4. Steam at 0.5MPa and 2020 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 10.3kJ/s. Calculate the exit velocity of steam. [16]
5. Two Carnot engines A and B are connected in series between two thermal reservoirs
at 1100K and 110K respectively. Engine A receives 1720 kJ of heat from the high
temperature reservoir and rejects heat to the Carnot engine B. Engine B takes in
heat rejected by engine A and rejects heat to the low temperature reservoir. If
engines A and B have equal thermal efficiencies, determine
(a) the heat rejected by engine B,
(b) the temperature at which heat is rejected by engine A. [16]
6. One kg of water at 277 K is brought into contact with a heat reservoir at 377 K.
When the water has reached 377 K, find the entropy change of the water, of the
reservoir, and of the universe. Specific heat of water is 4.187 kJ kg-1K-1. [16]
7. A refrigeration plant produces 0.14 kg/s of the ice at -60C from water at 280C. If
the power required to drive the plant is 25kW, determine the capacity of the ice
plant in tones and the actual COP. Cp of ice is 2.1 kJ kg-1 K-1. [16]
8. Discuss in brief generalized correlation of thermodynamic properties for gass. [16]
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