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Me6301 engineering thermodynamics uq - nov dec 2018

ENGINEERING THERMODYNAMICS ANNA UNIVERSITY QUESTION PAPER DECEMBER 2018

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Reg. No. : I I I I I I I J
,
I Question Paper Code·: 20804 I
B.E./B.Tech.. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2018.
' '
Third Semester
Mechanical Engineering·
ME 6301-. ENGINEERING THERMODYNAMICS
(Common to Automobile Engineering 1Mecliamcal and Automation Engineering)
· (Also common to PTME 8301 ..:.. Engineering Thermodynamics'for B.E. (Part-Time)
·Second Se~ester- Mechanical Engineering Regulations- 2014)
(Regulations 2013)
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A- (10 x 2 = 20 p1arks) ·
1. Differentiate between path fu~tions and point functions.
2. What is the work transfer in free. ~:xpansion process? And why?
3. Compare source with sink.
'
4.· What happens to energy, entropy an~ energy of an isolated-system? and why?
5. What is degree of superheat?
6. What is Carnot vapour cycle? Plot the same on T-s diagram.
.7. Define compressibility factor.
8. Wh~t is the significance of Clasius-Clapeyron equation? .
9. State Dalton'.slaw of partial pressure.
. 10. What is meant by degree of saturation? List the limiting values.
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
r --===================----~----------------------~·
PART B ·'- (5 x 13 = 65 marks)
11. (a) 5 kg of air at 100 kPa pressure and 333 K temperature is compressed .
pol:ytropically to pressure 750 kPa as per the law PvL3. It is then cooled
at constant pressure to 333 K. It is then cooled at constan.t temperature
to its original condition. Plot the cycle on p-v diagram, calculate the work
in each process and network andhea.t transfer.
Or ,
(h) A compressor delivers 720 kg of air per hour. Air enters at a velocity of
12 m/s, pressure of 1 bar .and specific volume of 0.5 m3/kg, leaves at a
velocity of 90 m/s, pressure of 8 bar and specific volume of 0.14 m3/kg..
The increase in enthalpy of air passing through the air compressor is
150 kJ/kg and heat loss tq- the surrotfndings is 12 kJ/s. Find: (i) power
required to drive the compressor; (ii) ratio of inlet to outlet pipe diameter.
12. (a) If three Carnot engines of same· efficiency connected in series 'Such that
the 1200 K reservoir' supplies 2400 ·kJ of heat and 150 K reservoir
receives 300 kJ of heat, find out the intermediate temperatures, the
effici:ency and the work output of all the engines.
Or
(I;>) Air flows through an adiabatic .compressor at 2 kg/s. The inlet conditions
are 100 kPa and 310 K and the exit conditions are 700 kPa and 560 K.
Consider T0 to be 298.K. Determine the chan~e in avallability. and the
irreversibility.
13. ~ (a) A cylinder with piston contains steam at 8 bar and 435°C. If it is cooled to .
200°C at constant pressure, calculate the heat and work transfer·per kg
(h)
and their directions. •
·Or
In a reheat Rankine cycle, steam enters the steam turbine at 30 bar and
.400°C and expands in a high~ pressu~ steam turbine to an intermediate
pressure of 3 bar. at which it is reheated to 400°C before entering the low
pressure turbine. The condenser pressure is 0.5 bar. If the mass flow rate
of. steam is 40 kg/s. calculate the specific steam consumption, the net
work per kg, the power outPut·and the thermal efficiency.
14. (a) 5 kmol of carbon monoxide is stored in a 1.135 m3 container at ·215 K.
Determine the pressUre using ·(i) ideal gas equation and (ii) van der ,
Waals equation. The constants in the van der Waals equation are
146.3 kPa.m6/kmo12 and 0.0394 m3fkmol.
Or ..
(h) Derive the four Maxwell's relations.
2 20804
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
•.
15. (a) Atmospheric air at 101.325 kPa and 288.15 K contains 21% oxygen and
79% nitrogen by vol~me; Calculate the (i) mole fractions and partial
pressures of oxygen and nitrogen and (ii) molar mass, gas constant and
density of the air.. Take molar mass pf oX)rgen and nitrogen as 32 and
28 kg/k.mol. · ·
Or
(b) . If the air flow of 1800 xnWh ~t 359
C and RH of 50% is mixed with another
air stream of 2100 m3/h ofair whose both dry and wet temperatures are
20°C. If the pressure is constant at 1 atm, calculate (i) the dry bulb
temperature (ii) the relative humidity (iii) the specific humidity (iv) the
volume flow rate of the mixture.
16. (a)
PART C- (~ x 15 = 15 marks)
An adiabatic air compressor is tO be powered by a direct-coupled
adiabati~ steam turbine that is also driving a generator. Steam enters
the turbine at 12.5 MPa and 500°C at a rate of 25 kg/s and exits at
10 kPa and a quality of 0.92. Air enters the compressor at 98 kPa and
295 K at a rate of 10 kg/s and exits at 1 MPa and 620 K. Determine the .
net power delivered to the generator by the turbine.
Or
. (b)· .During an. experiment conducted in a room at 25°C, a laboratory
assistant measures that a refrigerator that draws 2 kW of power has
removed 30,000 kJ of heat from the refrigerated space, which is
maintained at -30°C. The running time of the refrigerator during the
experiment · was 20 min. Determine if these measurements are
reasonable.
3 20804
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY

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Me6301 engineering thermodynamics uq - nov dec 2018

  • 1. .1 Reg. No. : I I I I I I I J , I Question Paper Code·: 20804 I B.E./B.Tech.. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2018. ' ' Third Semester Mechanical Engineering· ME 6301-. ENGINEERING THERMODYNAMICS (Common to Automobile Engineering 1Mecliamcal and Automation Engineering) · (Also common to PTME 8301 ..:.. Engineering Thermodynamics'for B.E. (Part-Time) ·Second Se~ester- Mechanical Engineering Regulations- 2014) (Regulations 2013) Time : Three hours Maximum : 100 marks Answer ALL questions. PART A- (10 x 2 = 20 p1arks) · 1. Differentiate between path fu~tions and point functions. 2. What is the work transfer in free. ~:xpansion process? And why? 3. Compare source with sink. ' 4.· What happens to energy, entropy an~ energy of an isolated-system? and why? 5. What is degree of superheat? 6. What is Carnot vapour cycle? Plot the same on T-s diagram. .7. Define compressibility factor. 8. Wh~t is the significance of Clasius-Clapeyron equation? . 9. State Dalton'.slaw of partial pressure. . 10. What is meant by degree of saturation? List the limiting values. BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
  • 2. r --===================----~----------------------~· PART B ·'- (5 x 13 = 65 marks) 11. (a) 5 kg of air at 100 kPa pressure and 333 K temperature is compressed . pol:ytropically to pressure 750 kPa as per the law PvL3. It is then cooled at constant pressure to 333 K. It is then cooled at constan.t temperature to its original condition. Plot the cycle on p-v diagram, calculate the work in each process and network andhea.t transfer. Or , (h) A compressor delivers 720 kg of air per hour. Air enters at a velocity of 12 m/s, pressure of 1 bar .and specific volume of 0.5 m3/kg, leaves at a velocity of 90 m/s, pressure of 8 bar and specific volume of 0.14 m3/kg.. The increase in enthalpy of air passing through the air compressor is 150 kJ/kg and heat loss tq- the surrotfndings is 12 kJ/s. Find: (i) power required to drive the compressor; (ii) ratio of inlet to outlet pipe diameter. 12. (a) If three Carnot engines of same· efficiency connected in series 'Such that the 1200 K reservoir' supplies 2400 ·kJ of heat and 150 K reservoir receives 300 kJ of heat, find out the intermediate temperatures, the effici:ency and the work output of all the engines. Or (I;>) Air flows through an adiabatic .compressor at 2 kg/s. The inlet conditions are 100 kPa and 310 K and the exit conditions are 700 kPa and 560 K. Consider T0 to be 298.K. Determine the chan~e in avallability. and the irreversibility. 13. ~ (a) A cylinder with piston contains steam at 8 bar and 435°C. If it is cooled to . 200°C at constant pressure, calculate the heat and work transfer·per kg (h) and their directions. • ·Or In a reheat Rankine cycle, steam enters the steam turbine at 30 bar and .400°C and expands in a high~ pressu~ steam turbine to an intermediate pressure of 3 bar. at which it is reheated to 400°C before entering the low pressure turbine. The condenser pressure is 0.5 bar. If the mass flow rate of. steam is 40 kg/s. calculate the specific steam consumption, the net work per kg, the power outPut·and the thermal efficiency. 14. (a) 5 kmol of carbon monoxide is stored in a 1.135 m3 container at ·215 K. Determine the pressUre using ·(i) ideal gas equation and (ii) van der , Waals equation. The constants in the van der Waals equation are 146.3 kPa.m6/kmo12 and 0.0394 m3fkmol. Or .. (h) Derive the four Maxwell's relations. 2 20804 BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY
  • 3. •. 15. (a) Atmospheric air at 101.325 kPa and 288.15 K contains 21% oxygen and 79% nitrogen by vol~me; Calculate the (i) mole fractions and partial pressures of oxygen and nitrogen and (ii) molar mass, gas constant and density of the air.. Take molar mass pf oX)rgen and nitrogen as 32 and 28 kg/k.mol. · · Or (b) . If the air flow of 1800 xnWh ~t 359 C and RH of 50% is mixed with another air stream of 2100 m3/h ofair whose both dry and wet temperatures are 20°C. If the pressure is constant at 1 atm, calculate (i) the dry bulb temperature (ii) the relative humidity (iii) the specific humidity (iv) the volume flow rate of the mixture. 16. (a) PART C- (~ x 15 = 15 marks) An adiabatic air compressor is tO be powered by a direct-coupled adiabati~ steam turbine that is also driving a generator. Steam enters the turbine at 12.5 MPa and 500°C at a rate of 25 kg/s and exits at 10 kPa and a quality of 0.92. Air enters the compressor at 98 kPa and 295 K at a rate of 10 kg/s and exits at 1 MPa and 620 K. Determine the . net power delivered to the generator by the turbine. Or . (b)· .During an. experiment conducted in a room at 25°C, a laboratory assistant measures that a refrigerator that draws 2 kW of power has removed 30,000 kJ of heat from the refrigerated space, which is maintained at -30°C. The running time of the refrigerator during the experiment · was 20 min. Determine if these measurements are reasonable. 3 20804 BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY