Hall Ticket No Question Paper Code: AME003
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
Four Year B.Tech III Semester End Examinations (Supplementary) July, 2018
Regulation: IARE R16
THERMODYNAMICS
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Explain Quasi static process with neat sketch.
A fluid, contained in a horizontal cylinder fitted with a frictionless leak proof piston, is continuously
agitated by means of a stirrer passing through the cylinder cover. The cylinder diameter
is 0.40 m. During the stirring process lasting 10 minutes, the piston slowly moves out a distance
of 0.485 m against the atmosphere. The net work done by the fluid during the process is 2 kJ.
The speed of the electric motor driving the stirrer is 840 rpm. Determine the torque in the shaft
and the power output of the motor.
2. Explain the following
i. Constant volume gas thermometer
ii. Zeroth law of thermodynamics
A gas undergoes a thermodynamic cycle consisting of the following process
i. Process constant pressure, P1=1.4bar, V1=0.028 m3,
ii. Process compression with U3=U2
iii. Process constant volume U1=U3 -26.4KJ. There are no significant change in KE and
PE. Sketch the cycle on a PV diagram and prove that P
Qcycle P
Wcycle
UNIT II
3. What are the limitations of first law of thermodynamics?
A heat pump working on the Carnot cycle takes in heat from a reservoir at 5°C and delivers heat
to a reservoir at 600C. The heat pump is driven by a reversible heat engine which takes in heat
from a reservoir at 840°C and rejects heat to a reservoir at 60°C. The reversible heat engine also
drives a machine that absorbs 30 kW. If the heat pump extracts 17 kJ/s from the 50C reservoir,
determine
i. The rate of heat supply from the 840°C source
ii. The rate of heat rejection to the 60°C sink.
4. Derive Maxwell's relations from thermodynamic relations
One kg of ice at is exposed to the atmosphere which is at 200C. The ice melts and comes
into thermal equilibrium with the atmosphere. Determine the entropy increase of the universe.
Take specific heat for ice 2.0982kJ/kgK and latent heat of fusion 333.3kJ/kg.
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UNIT III
5. With a neat sketch explain Throttling Calorimeter.
Ten kg of water at 450C is heated at constant pressure of 10 bar until it become superheated
vapor at 3000C. Find the changes in volume, enthalpy, internal energy and entropy.
6. Explain triple point and critical point with respect to pressure temperature plot.
A rigid vessel of volume 0.86 m3 contains 1 kg of steam at a pressure of 2 bar. Evaluate the
specific volume, temperature, dryness fraction, internal energy, enthalpy and entropy of steam.

UNIT IV
7. State and prove the Gibbs theorem.
A gaseous mixture consists of 1kg of oxygen and 2kg of nitrogen at a pressure of 150kPa and a
temperature of 200C. Determine
i. Mole fraction of each constitute
ii. The equivalent molecular weight of the mixture
iii. The equivalent gas constant of the mixture
iv. The partial pressure and volumes
v. The cp and cv of the mixture
8. Define below terms
i. Dry bulb temperature
ii. Wet bulb temperature
iii. Specific humidity
iv. Relative humidity
The reading from sling psychrometer as follows, Dry bulb temperature 300C, Wet bulb temperature
200C and barometer reading 740 mm of Hg. Using steam table determine, Dew
point temperature, Relative humidity, Specific humidity and Degree of saturation.
UNIT V
9. Explain with PV and T s plot for same compression ratio and heat rejection, which cycle is
highest efficiency (Otto, Diesel and Dual cycle)
In an air standered Otto cycle the compression ratio is and compression begins at 350C,
0.1MPa. The maximum temperature of the cycle is 11000C. Find
i. The work done per kg of air
ii. The cycle efficiency
iii. The mean effective pressure of the cycle.
10. Explain Bell- Coleman cycle with PV and T s diagram.
A diesel engine has a compression ratio of 14 and cutoff takes place at of the stroke. Find air
standard efficiency.