EE 304 APPLIED THERMODYNAMICS 2008 Tamil Nadu State Anna University B.E Electrical and Electronics Question paper

ANNA UNIVERSITY – COIMBATORE
B.E.\B.TECH.DEGREE-EXAMINATION-DECEMBER 2008
THIRD SEMESTER-ELECTRICAL&ELECTRONIC ENGG.
EE 304-APPLIED THERMODYNAMICS

PART A-(2*20=40)
1. State first law of thermodynamic.
2. Define path and point function.
3. State carnot`s theorem
4. Define thermodynamic equilibrium.
5. Define scavenging.
6. State any two disadvantage of two-stroke engine
7. State the assumption made in a standard air cycle analysis.
8. What are the main components of gas turbine power paint.
9. Give the example of impulse and reaction turbines.
10. What is meant by compounding of turbine.
11. Define latent heat of vaporization.
12. What is the function of an economizer and super heater in a boiler.
13. Define volumetric efficiency.
14. What is meant by free air delivered.
15. Define compression ratio.
16. What is the purpose is of inter cooler.
17. Define dew point temperature
18. Define tone of refrigeration.
19. What is sub cooling.
20. Distinguish between refrigeration and air-condition

PART-B(16 MARKS QUESTION
1. A) A cyclic heat engine operates between a source temperature of 800°c and a sink temperature of 30°c. What is the least rate of rejection per kW net output of the engine.
B) Derive the S.F.E.E. for a single stream entering and a single stream leaving a control volume and explain the various terms in it.

2. A) With a neat sketch the working principle of a four stroke diesel engine.
B) Compare SI and CI engines.

3. A) With a neat layout explain the working principle of a steam power paint.
B) Differentiate between impulse and reaction turbine.

4. A) IN a ideal bryton cycle air from the atmosphere at 1 atm, 300 k is compressed to 6 atm and the maximum cycle temperature is limited to 1100 k by using large air-fuel ratio. If the heat supply is 100 mw, find1) the thermal efficiency of the cycle2) work ratio, 3) power output,4)energy flow rate of the exhaust gas leaving the turbine.
B) Compare open and closed cycle gas turbines.

5. A) A boiler working at a pressure of 14 bars evaporates 8.6 kg of water per kg o f coal fired from feed water entering at 39°c. The steam at the boiler stop valve is 0.92 dry. Determine the equivalent evaporation from and at 100°c. Also determine the thermal efficiency of the boiler if the calorific value of the coal is 30200 kj\kg.
B) What is enthalpy of steam and define dryness fraction.

6. A) Explain the working of a single cylinder reciprocating air compressor with a neat sketch.
B) Prove that the inter stage pressure P2 is the geometric mean of the initial pressure P1and final pressure P3 in a two stage reciprocating air compressor.

7. A) Explain the vapour compression cycle with the help of T-S diagram.
B) A refrigeration system works on reversed Carnot’s cycle between temperature limits of 40°c and -10°c. The capacity of the unit is 10 tonne. Determine i) COP II) work input into the system.

8. A) Explain the window air conditioning system with a neat sketch.
B) Define dry bulb and wet bulb temperature.