CHEMICAL ENGINEERING THERMODYNAMICS-I JNTU UNIVERSITY PREVIOUS YEAR QUESTION PAPER COLLECTION for second year second semester chemical engineering department

CHEMICAL ENGINEERING THERMODYNAMICS-I JNTU UNIVERSITY PREVIOUS YEAR QUESTION PAPER COLLECTION for second year second semester chemical engineering department

CHEMICAL ENGINEERING THERMODYNAMICS-I JNTU UNIVERSITY PREVIOUS YEAR QUESTION PAPER COLLECTION for second year second semester chemical engineering department

II B.Tech II Semester Regular Examinations, Apr/May 2008

CHEMICAL ENGINEERING THERMODYNAMICS-I

(Chemical Engineering)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

⋆ ⋆ ⋆ ⋆ ⋆

1. (a) Define the following:
i. Work
ii. Internal energy
iii. Kinetic energy
iv. Potential energy.
(b) Water is falling from a height of 100 metre, at a rate of 5000 kg/hr is used to
feed turbine in a hydro electric power station. What is potential energy?
[8+8]
2. Compute the degrees of freedom if,
(a) System is made up by liquid solution of alcohol and liquid water in equilibrium
with its vapours.
(b) System is made by partial decomposition of NH4Cl.
(c) A mixture of N2, H2 and NH3 exists in chemical equilibrium at elevated tem-
perature. [5+5+6]
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 2000 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 10kJ/s. Calculate the exit velocity of steam. [16]
5. An inventor claims to have designed a heat engine, which absorbs 1500 kJ and
150kJ energy as heat from reservoirs at 1000K and 300K respectively and rejects
600kJ energy as a heat to a reservoir at 600K. It delivers 1050 kJ work. Judge,
whether the claim is acceptable or not. [16]
6. One kg of water at 273 K is brought into contact with a heat reservoir at 373 K.
When the water has reached 373 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 0.135 kg/s of the ice at -40C from water at 290C. If
the power required to drive the plant is 24kW, 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]
1 of 2
Code No: R05220802 Set No. 1
8. (a) Define availability.
(b) Does the availability depends upon the conditions of system and surroundings.
[6+10]
⋆ ⋆ ⋆ ⋆ ⋆

II B.Tech II Semester Regular Examinations, Apr/May 2008

CHEMICAL ENGINEERING THERMODYNAMICS-I

(Chemical Engineering)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks

⋆ ⋆ ⋆ ⋆ ⋆

1. (a) What are various prefixes for SI units.
(b) An astronaut weighs 700 N in Houston, Texas, where the local acceleration of
gravity is 9.792 ms−2. What are astronauts’ mass and weight on the moon,
where g is 1.67 ms−2? [6+10]


2. (a) What is the necessity of classifying point and path functions?
(b) What is heat? Is it a path function? Explain. [8+8]
3. If one kmol of methane is stored in 0.32 m3 tank at 302K, estimate the pressure of
the gas using Red lich - Kwong equation of state. The critical constants of methane
are Pc = 4.60 MPa and Tc = 190.6K. [16]
4. Ammonia gas is compressed from 210C and 200 kPa to 1010 kPa in an adiabatic
compressor with an efficiency of 0.81. Estimate the work required per mol of
ammonia, enthalpy and entropy changes of the ammonia. [16]
5. (a) A reversible engine absorbs 1150 kJ as heat from a source at 5750C, delivers
575 kJ as work and rejects the rest of the energy to a sink. Determine the
sink temperature.
(b) A Carnot engine absorbs 1100 kJ as heat from a reservoir at 550 K and rejects
energy to a sink at 295 K. Determine the efficiency of the engine and energy
rejected to the sink. [8+8]
6. A steel casting [Cp = 0.5k J kg−1K−1] weighing 40 kg and at a temperature of 4500C
is quenched in 150 kg of oil at 250C [Cp = 0.25k J kg−1K−1] If there are no heat
losses, what is the change in entropy of
(a) casting
(b) the oil and
(c) both considered together. [16]
7. A refrigeration plant produces 0.135 kg/s of the ice at -40C from water at 290C. If
the power required to drive the plant is 24kW, 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. A system has equation of state as, PV=ZRT,
show that, @H
@p T
= −RT2
p