Download JNTUA B.Tech 4-2 R13 2017 April Regular 13A03804 Power Plant Engineering Question Paper

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Code: 13A03804

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B.Tech IV Year II Semester (R13) Regular Examinations April 2017

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POWER PLANT ENGINEERING

(Mechanical Engineering)

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Time: 3 hours

Max. Marks: 70

PART - A

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(Compulsory Question)

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1. Answer the following: (10 X 02 = 20 Marks)
   1. Enumerate various types of tariff and explain any two of them.

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   2. What are the considerations on which the location of a power plant depends?
   3. What do you understand by the term 'Boiler Draught'?
   4. How are boilers classified?
   5. What are the advantages and disadvantages of diesel power plant?
   6. State the limitations of gas turbines.

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   7. What is a spillway?
   8. What is cavitation? How can it be avoided?
   9. What is thermoelectric effect?
   10. State a hydrogen-oxygen fuel cell.

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PART - B

(Answer all five units, 5 X 10 = 50 Marks)

UNIT - I

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1. A power supply system has a hydro power plant of 12 MW capacity and diesel power plant of 30 MW capacity. The hydro power plant has a pondage provision and can store water to generate 120 MWh. For the coming week the estimated power in river flow is 3 MW and expected load to be supplied as follows.
   
   

   Load (MW)	Time (hours)
   42	8
   30	6
   20	4
   60	2
   25	10
   15	12
   Total = 168 hours

   
   (i) Calculate total energy that can be generated by hydro power plant.
   

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   (ii) How the load shall be shared by the two power plants?
   OR
2. A 60 MW power station has an annual peak load of 50 MW. The power station supplies loads having maximum demands of 20 MW, 17 MW, 10 MW and 9 MW. The annual load factor is 0.45.
   
   Find: (i) Average load. (ii) Energy supplied per year. (iii) Diversity factor. (iv) Demand factor.

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UNIT - II

1. The steam at 36 bar and 350°C is supplied to a steam power plant working on a single stage regenerative cycle. The condenser pressure is 0.2 bar and the steam is at 5 bar. Calculate the regenerative cycle efficiency and compare it with that of Rankine cycle.
   OR

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2. Explain with a neat sketch of Lamont boiler. List the advantages and disadvantages.

UNIT - III

1. A four cylinder four stroke SI engine is designed to develop 44 kW indicated power at a speed of 3000 rpm. The compression ratio used is 6. The law of compression and expansion is pV^1.3 = constant and heat addition and rejection takes place at constant volume. The pressure and temperature at the beginning of compression stroke are 1 bar and 50°C. The maximum pressure of the cycle is limited to 30 bar. Calculate the dimensions and stroke of each cylinder assuming all cylinders have equal dimensions. Assume diagram factor = 0.8 and ratio of stroke / bore = 1.5.
   

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   OR
2. In an open cycle constant pressure gas turbine air enters the compressor at 1 bar and 300 K. The pressure of air after the compression is 4 bar. The isentropic efficiencies of compressor and turbine are 78% and 85% respectively. The air-fuel ratio is 80:1. Calculate the power developed and thermal efficiency of the cycle, if the flow rate of air is 2.5 kg/s. Take Cp = 1.005 kJ/kgK and γ = 1.4 for air and Cpg = 1.147 kJ/kgK and γ = 1.33 for gases. R = 0.287 kJ/kgK. Calorific value of fuel = 42000 kJ/kg.

UNIT - IV

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1. Explain two types of surge tanks with neat sketch.
   OR
2. Explain in detail the hydro plant auxiliaries.

UNIT - V

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1. Explain vertical axis wind mill turbine with all components and list out the advantages and disadvantages.
   OR
2. Explain flat plate solar collector with a neat sketch.



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