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Code: 15A03804
B.Tech IV Year II Semester (R15) Advanced Supplementary Examinations July 2019
POWER PLANT ENGINEERING
(Mechanical Engineering)
Time: 3 hours Max. Marks: 70
PART ? A
(Compulsory Question)
*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Explain the principle of harnessing nuclear energy.
(b) How important is cost analysis of a power plant? Explain.
(c) Explain the necessity of a proper draught system.
(d) What is enthalpy of steam? Write an expression for enthalpy of a superheated steam.
(e) Draw neat sketch of an IC engine and label its parts.
(f) List the different methods to improve efficiency of a gas turbine plant.
(g) List the different types of gates used in dams.
(h) Explain the function of surge tank.
(i) List the advantages of non-conventional sources over conventional sources.
(j) Give a note of usage of graphite in nuclear reactors.
PART ? B
(Answer all five units, 5 X 10 = 50 Marks)
UNIT ? I
2 Give a note on the scenario of power generation from renewable sources in India.
OR
3 Define load factor. A power station supplies the following loads to the consumers.
Time in hrs 0-6 6-10 10-12 12-16 16-20 20-22 22-24
Load in MW 30 70 90 60 100 80 60
(i) Draw the load curve and estimate the load factor of the plant.
(ii) What is the load factor of a standby equipment of 30 MW capacity if it takes up all the loads
above 70 MW. What is the use factor?
UNIT ? II
4 (a) Explain with neat sketch the working principle of out plant handing of coal.
(b) Explain how waste heat recovery is achieved in modern boilers.
OR
5 (a) Explain with neat sketch the working principle of overfeed stoker.
(b) Explain the neat diagram the working principle of cyclone furnace.
UNIT ? III
6 Explain with suitable diagram the working of diesel power plant.
OR
7 An open cycle constant pressure gas turbine plant consists of two turbines with perfect intercooling
and a two stage turbine with a reheater. Air enters at 1 bar, 15 ?. The maximum pressure ratio and
the maximum temperature of the cycle are limited to 5 and 800 ? respectively. The reheating takes
place at 2.3 bar to 800 ?. The isentropic efficiencies of each compressor and each turbine are
0.8 and 0.9 respectively. The calorific value of fuel is 42 MJ/kg. Taking Cp = 1.005 kJ/kgK and
?? = 1.33 for gases and neglecting pressure and heat losses and if the flow rate of air is 25 kg/s,
estimate: (i) The overall thermal efficiency of the plant. (ii) The air fuel ratio. (iii) The specific fuel
consumption. (iv) Power output of the plant.
Contd. in page 2
Page 1 of 2
R15
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Code: 15A03804
B.Tech IV Year II Semester (R15) Advanced Supplementary Examinations July 2019
POWER PLANT ENGINEERING
(Mechanical Engineering)
Time: 3 hours Max. Marks: 70
PART ? A
(Compulsory Question)
*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Explain the principle of harnessing nuclear energy.
(b) How important is cost analysis of a power plant? Explain.
(c) Explain the necessity of a proper draught system.
(d) What is enthalpy of steam? Write an expression for enthalpy of a superheated steam.
(e) Draw neat sketch of an IC engine and label its parts.
(f) List the different methods to improve efficiency of a gas turbine plant.
(g) List the different types of gates used in dams.
(h) Explain the function of surge tank.
(i) List the advantages of non-conventional sources over conventional sources.
(j) Give a note of usage of graphite in nuclear reactors.
PART ? B
(Answer all five units, 5 X 10 = 50 Marks)
UNIT ? I
2 Give a note on the scenario of power generation from renewable sources in India.
OR
3 Define load factor. A power station supplies the following loads to the consumers.
Time in hrs 0-6 6-10 10-12 12-16 16-20 20-22 22-24
Load in MW 30 70 90 60 100 80 60
(i) Draw the load curve and estimate the load factor of the plant.
(ii) What is the load factor of a standby equipment of 30 MW capacity if it takes up all the loads
above 70 MW. What is the use factor?
UNIT ? II
4 (a) Explain with neat sketch the working principle of out plant handing of coal.
(b) Explain how waste heat recovery is achieved in modern boilers.
OR
5 (a) Explain with neat sketch the working principle of overfeed stoker.
(b) Explain the neat diagram the working principle of cyclone furnace.
UNIT ? III
6 Explain with suitable diagram the working of diesel power plant.
OR
7 An open cycle constant pressure gas turbine plant consists of two turbines with perfect intercooling
and a two stage turbine with a reheater. Air enters at 1 bar, 15 ?. The maximum pressure ratio and
the maximum temperature of the cycle are limited to 5 and 800 ? respectively. The reheating takes
place at 2.3 bar to 800 ?. The isentropic efficiencies of each compressor and each turbine are
0.8 and 0.9 respectively. The calorific value of fuel is 42 MJ/kg. Taking Cp = 1.005 kJ/kgK and
?? = 1.33 for gases and neglecting pressure and heat losses and if the flow rate of air is 25 kg/s,
estimate: (i) The overall thermal efficiency of the plant. (ii) The air fuel ratio. (iii) The specific fuel
consumption. (iv) Power output of the plant.
Contd. in page 2
Page 1 of 2
R15
Code: 15A03804
UNIT ? IV
8 Give a note on hydroelectric power plant generation in India and its future with neat diagram.
OR
9 (a) A Pelton wheel driven by two similar jets transmits 4000 kW to the shaft while running at 400 rpm.
The head from the reservoir level to the nozzle is 200 m and the efficiency of power transmission
through the pipelines and nozzles is 90%. The jets are tangential to a 1.50 m diameter circle. The
relative velocity decreases by 10% as the water traverses the buckets, which are so shaped that
they would, if stationary, deflect the jet by 165 ?. Neglecting the windage losses, estimate:
(i) The efficiency of the runner. (ii) The diameter of each jet.
(b) Explain classification of dams and spillways.
UNIT ? V
10 Differentiate between solar thermal and solar photovoltaic. List the different types of solar collectors
and explain any one of them with a neat sketch.
OR
11 (a) Differentiate between heavy water reactors and gas cooled reactors.
(b) With a neat sketch, explain the working of a pressurized water reactor.
*****
Page 2 of 2
R15
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This post was last modified on 10 September 2020