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Me6301 engineering thermodynamics uq - may june 2016

This document appears to be an exam for an engineering thermodynamics course, as it covers various concepts in thermodynamics. It contains 15 multi-part questions testing knowledge of topics like the first and second laws of thermodynamics, cycles, phase changes, properties of mixtures, and psychrometrics. The questions involve calculations related to closed systems undergoing various thermodynamic processes, including constant pressure, polytropic, and mixing processes. Students are asked to determine quantities like efficiency, work, heat, and entropy change. Diagrams are also referenced, like T-S and P-V diagrams that would be helpful for representing thermodynamic cycles.

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Reg. No.I I I I I I I I I I I I I
Question Paper Code: 57539
B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2016
Third Semester
Mechanical Engineering
ME 6301 -ENGINEERING THERMODYNAMICS
(Common to Automobile Engineering and Mechanical and Automation Engineering)
(Regulations 2013)
Time : Three Hours Maximum : 100 Marks
(Use of approved Thermodynamics Tables, Mollier diagram, Psychrometric chart and
Ref1igerant property tables permitted in the Examinations)
Answer. ALL questions•
. PART- A (10 x 2 =20 Marks)
l. Write down the equation for first law for a steady flow process.
2. Give the energy equation applicable for an adiabatic nozzle and an adiabatic turbine.
3. A reversible heat engine operates between a so.urce at 800 °C and a sink at 30 °C.
What is the least rateofheat rejection per KW network output ofthe engine.?
4. Define Irreversibility?
5. State the phase rule for pure substance.
6. Mention the two working fluids used in binary vapour cycle.
7. What are reduced properties? Give their significance?
07-06 l 57539
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
8. What is the importance ofJoule-Thomson coefficient ?
9. State Dalton's law ofpartial pressure. On what assumptions this law is based?
10. What is adiabatic mixing and write the equation for that?
PART- B (5 X 16 = 80 Marks)
11. (a) A mass of air is initially at 260 °C and 700 kPa, and occupies 0.028 m3
.The air
is expanded at constant pressure to 0.084 m3
. A polytropic process with n = 1.5
is then carried out followed by a constant temperature process which completes
a cycle. All the process are reversible.
(1) Sketch the cycle in T-S and P-V planes
(2) Find the heat received and heat rejected in the cycle.'
(3) .Fin& the efficiency ofthe cycle.
OR
(b) (i) A room for four person has 2 fans ,each consuming 0.18 kW power, and
three 100 W lamps. Ventilation air at the rate of 80 kglhr enters with an
. enthalpy of 84 kJ/kg and leaves with an enthalpy of 59 kJ/kg. If each
person puts out heat at the rate of 630 kJ/hr. Determine the rate at which
heat is removed by a room cooler, so that a steady state is maintained in
(16)
the room. (8) ·
(ii) An insulated rigid tank of 1.5 m3
of air with a .pressure of 6 bar and
100 °C discharges air in to the atmosphere which is at 1 bar through a
discharge pipe till its pressure becomes 1 bar.
(1) Calculate the velocity of air in the discharge pipe.
(2) Evaluate the work that can be obtained from the frictionless turbine
using the kinetic energy ofthat air. (8)
2 57539
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
12. (a) A heat engine operating between two reservoirs at 1000 k and 300k is used to
drive a heat pump which extracts heat from the reservoir at 300 k at a· rate twice
that at which the engine rejects heat to it. If the efficiency of the engine is 40%
of the maximum possible and the cop ofthe heat pump is 50% of the maximum
possible, what is the temperature of the reservoir to which the heat pump rejects
heat ? What is the rate of heat rejection from the heat pump if the rate of heat
supply to the engine is 50 kW? (16)
OR
(b) (i) 50 kg of water is at 313 K and enough ice at -5 °C is mixed with water in
an adiabatic vessel such that at the end of the process all the ice melts and
water at 0 °C is obtained. Find the mass of ice required and the entropy
change of water and ice. Given CP of water = 4.2 kJ/kgK, CP of ice = 2.1
kJ!kgk and latent heat ofice= 335 kJ/kg. (10)
(ii) -A heat engine receives 800 kJ of heat from the reservoir at 1000 K and
rejects 400 kJ at 400k. If the surrounding is at 300 K, calculate the first
I
and the second law efficiency, and the relative efficiency of the heat
engine.
13. (a) A large insulated vessel is divided into two chambers, one containing 5. kg of
dry saturated steam at 0.2 MPa and the other 10 kg of steam, 0.8 quality at
0.5 MPa. If the partition between the chambers is removed and the st~am is
mixed thoroughly and allowed to settle, find the final pressure, steam quality
(6)
and entropy change in the process. (16)
OR
(b) (i) Why is Camot cycle not practicable for a steam power plant?
(ii) In a steam power plant the condition of steam at inlet to the steam turbine
'
is 20 bar and 300 °C and the condenser pressure is 0.1 bar. Two feed
water heaters operate at optimum temperatures. Determine: (1) The
quality of steam at turbine exhaust, (2) network per kg of steam, (3) cycle
(4)
efficiency, (4) the steam rate. Neglect pump work. (12)
3 57539
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
14. (a) (i) A vessel of volume 0.28 m3
contains 10 kg of air at 320 K. Determine the
pressure exerted by the air using a) perfect gas equation b) Vander walls
equation c) Generalised compressibility chart.(Take critical temperature of
air as 132.8 K and critical pressure ofair as 37.71:iar).
(ii) Draw a neat schematic of a compressibility chart and indicate its salient
features.
OR
(b) What is meant by phase change process ? Derive Clausius-Clapeyron equation
for a phase change process. Give the significance ofthis equation.
15. (a) A rigid tank of5 m3
contains gas mixture comprising 3 kg of02, 4 kg ofN2 and
5 kg of C02 at 290 K. Calculate the molar specific volume, initial pressure of
the gas. If it is heated to 350 K, calculate the heat transfer and change in
(10)
(6)
(16)
enth~py. Also verify the Gibbs theorem for entropy. (16)
OR
(b) A room 7m*4m*4m is occupied by an air-water vapour mixture at 38 °C. The
atmospheric pressure is 1 bar and the relative humidity is 70%. Determine the
humidity ratio, dew point, mass of dry air and mass of water vapour. If the
mixture of air-water vapour is further cooled at constant pressure until the
temperature is 10°C. Find the amount of water vapour condensed. (16)
4 57539
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY

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Me6301 engineering thermodynamics uq - may june 2016

  • 1. Reg. No.I I I I I I I I I I I I I Question Paper Code: 57539 B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2016 Third Semester Mechanical Engineering ME 6301 -ENGINEERING THERMODYNAMICS (Common to Automobile Engineering and Mechanical and Automation Engineering) (Regulations 2013) Time : Three Hours Maximum : 100 Marks (Use of approved Thermodynamics Tables, Mollier diagram, Psychrometric chart and Ref1igerant property tables permitted in the Examinations) Answer. ALL questions• . PART- A (10 x 2 =20 Marks) l. Write down the equation for first law for a steady flow process. 2. Give the energy equation applicable for an adiabatic nozzle and an adiabatic turbine. 3. A reversible heat engine operates between a so.urce at 800 °C and a sink at 30 °C. What is the least rateofheat rejection per KW network output ofthe engine.? 4. Define Irreversibility? 5. State the phase rule for pure substance. 6. Mention the two working fluids used in binary vapour cycle. 7. What are reduced properties? Give their significance? 07-06 l 57539 BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
  • 2. 8. What is the importance ofJoule-Thomson coefficient ? 9. State Dalton's law ofpartial pressure. On what assumptions this law is based? 10. What is adiabatic mixing and write the equation for that? PART- B (5 X 16 = 80 Marks) 11. (a) A mass of air is initially at 260 °C and 700 kPa, and occupies 0.028 m3 .The air is expanded at constant pressure to 0.084 m3 . A polytropic process with n = 1.5 is then carried out followed by a constant temperature process which completes a cycle. All the process are reversible. (1) Sketch the cycle in T-S and P-V planes (2) Find the heat received and heat rejected in the cycle.' (3) .Fin& the efficiency ofthe cycle. OR (b) (i) A room for four person has 2 fans ,each consuming 0.18 kW power, and three 100 W lamps. Ventilation air at the rate of 80 kglhr enters with an . enthalpy of 84 kJ/kg and leaves with an enthalpy of 59 kJ/kg. If each person puts out heat at the rate of 630 kJ/hr. Determine the rate at which heat is removed by a room cooler, so that a steady state is maintained in (16) the room. (8) · (ii) An insulated rigid tank of 1.5 m3 of air with a .pressure of 6 bar and 100 °C discharges air in to the atmosphere which is at 1 bar through a discharge pipe till its pressure becomes 1 bar. (1) Calculate the velocity of air in the discharge pipe. (2) Evaluate the work that can be obtained from the frictionless turbine using the kinetic energy ofthat air. (8) 2 57539 BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
  • 3. 12. (a) A heat engine operating between two reservoirs at 1000 k and 300k is used to drive a heat pump which extracts heat from the reservoir at 300 k at a· rate twice that at which the engine rejects heat to it. If the efficiency of the engine is 40% of the maximum possible and the cop ofthe heat pump is 50% of the maximum possible, what is the temperature of the reservoir to which the heat pump rejects heat ? What is the rate of heat rejection from the heat pump if the rate of heat supply to the engine is 50 kW? (16) OR (b) (i) 50 kg of water is at 313 K and enough ice at -5 °C is mixed with water in an adiabatic vessel such that at the end of the process all the ice melts and water at 0 °C is obtained. Find the mass of ice required and the entropy change of water and ice. Given CP of water = 4.2 kJ/kgK, CP of ice = 2.1 kJ!kgk and latent heat ofice= 335 kJ/kg. (10) (ii) -A heat engine receives 800 kJ of heat from the reservoir at 1000 K and rejects 400 kJ at 400k. If the surrounding is at 300 K, calculate the first I and the second law efficiency, and the relative efficiency of the heat engine. 13. (a) A large insulated vessel is divided into two chambers, one containing 5. kg of dry saturated steam at 0.2 MPa and the other 10 kg of steam, 0.8 quality at 0.5 MPa. If the partition between the chambers is removed and the st~am is mixed thoroughly and allowed to settle, find the final pressure, steam quality (6) and entropy change in the process. (16) OR (b) (i) Why is Camot cycle not practicable for a steam power plant? (ii) In a steam power plant the condition of steam at inlet to the steam turbine ' is 20 bar and 300 °C and the condenser pressure is 0.1 bar. Two feed water heaters operate at optimum temperatures. Determine: (1) The quality of steam at turbine exhaust, (2) network per kg of steam, (3) cycle (4) efficiency, (4) the steam rate. Neglect pump work. (12) 3 57539 BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
  • 4. 14. (a) (i) A vessel of volume 0.28 m3 contains 10 kg of air at 320 K. Determine the pressure exerted by the air using a) perfect gas equation b) Vander walls equation c) Generalised compressibility chart.(Take critical temperature of air as 132.8 K and critical pressure ofair as 37.71:iar). (ii) Draw a neat schematic of a compressibility chart and indicate its salient features. OR (b) What is meant by phase change process ? Derive Clausius-Clapeyron equation for a phase change process. Give the significance ofthis equation. 15. (a) A rigid tank of5 m3 contains gas mixture comprising 3 kg of02, 4 kg ofN2 and 5 kg of C02 at 290 K. Calculate the molar specific volume, initial pressure of the gas. If it is heated to 350 K, calculate the heat transfer and change in (10) (6) (16) enth~py. Also verify the Gibbs theorem for entropy. (16) OR (b) A room 7m*4m*4m is occupied by an air-water vapour mixture at 38 °C. The atmospheric pressure is 1 bar and the relative humidity is 70%. Determine the humidity ratio, dew point, mass of dry air and mass of water vapour. If the mixture of air-water vapour is further cooled at constant pressure until the temperature is 10°C. Find the amount of water vapour condensed. (16) 4 57539 BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY