Hall Ticket No Question Paper Code: AME003
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech III Semester End Examinations (Supplementary) January/February, 2018
Regulation: IARE R16
THERMODYNAMICS
(Mechanical Engineering)
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. Classify thermodynamic systems with an example.
0.5 kg of air is compressed reversibly and adiabatically from 80 kPa, 60C to 0.4MPa, and is then
expanded at constant pressure to original volume. Sketch these processes on the P-V and T-S
planes. Compute the heat transfer and work transfer for the whole path.
2. Show that energy is property of a system.
A nozzle is a device for increasing the velocity of a steadily flowing stream. At the inlet to a
certain nozzle, the enthalpy of the fluid passing is 3000 kJ/kg and the velocity is 60 m/s. At the
discharge end, the enthalpy is 2762 kJ/kg. The nozzle is horizontal and there is negligible heat
loss from it.
i. Find the velocity at exist from the nozzle.
ii. If the inlet area is 0.1 m2 and the specific volume at inlet is 0.187 m3/kg, find the mass flow
rate.
iii. If the specific volume at the nozzle exit is 0.498m3/kg, find the exit area of the nozzle.
UNIT II
3. State Kelvin-Planck and Clausius statement of II law of thermodynamics. Show that Kelvin
Planck statement is equivalent to Clausius.
A Carnot Engine operates between source temperature of T1 K and sink temperature of T2 K.
The difference between the source and sink temperature is 240. If the work developed by the
Carnot engine is 0.74 times the heat rejected by Carnot engine to sink, find the efficiency of
engine and also source temperature and sink temperature.
4. State and prove clausius inequality.
2 Kg of water is heated at 80C and mixed adiabatically with 3 Kg of water at 30C in a constant
pressure process at 1 atmosphere. Find the increase in the entropy of the total mass of water
due to the mixing process. (Cp of water 4.187
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UNIT III
5. Explain throttling calorimeter with neat sketch?
Steam expands entropically in a nozzle from 1 MPa, 250C to 10 kPa. The steam flow rate is
1 kg/s. Find the velocity of steam at the exit from the nozzle, and the exit area of the nozzle.
Neglect the velocity of the steam at the inlet to the nozzle.
6. What are the two assumptions of real gas? Derive expression for Vander Waals equation for real
gas.
Steam initially at 1.5 MPa, 300C expands reversibly and adiabatically in a steam turbine to
40C. Determine the ideal work output of the turbine/ kg of steam.
UNIT IV
7. Consider a gas mixture that consists of 3 kgs of O2, 5 kgs of N2 and 12kg of CH4. Determine
i. Mass fraction of each component
ii. Mole fraction of each component
iii. Avg molecular mass and gas constant of the mixture.
Represent the psychometric chart on co ordinates and also define the terms related to psychomerty.
Represent the psychometric chart on co ordinates and also define the terms related to
psychomerty.
8. Define
i. Pure substance
ii. Dryness fraction
iii. Irreversibility
iv. Mole fraction.
The analysis by weight of perfect gas mixture at 20C and 1.3 bar is 10% O2 (molecular mass
70% N2 (molecular mass 15% CO2 (molecular mass 44) and CO molecular mass
28) for a reference state of 0C and 1 bar, Determine
i. Partial pressure of the constituents.
ii. Gas constant of mixture.
UNIT V
9. Represent the process involved in Otto-cycle on PV and TS, Diagram and derive its air standard
efficiency.
An air standard Otto-cycle is designed to operate with following data
Maximum cycle pressure and temperature 5 mpa and 2250 k
Minimum cycle pressure and temperature 0.1 mpa and 300k
Determine the net work output per unit mass of working fluid and thermal efficiency
10. Derive an expression for COP of Bell Coleman cycle with the help of PV and TS diagram.
A refrigerator system operating on a reversed system operating on reversed Carnot cycle produces
400 kg/hr of ice at from water at 30C. Make calculation for
i. Power required to drive the machine
ii. Heat rejected from the system. Take latent heat of freezing of 335 KJ/Kg and specific heat
of ice is 2.1 KJ/Kg-K.