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*X10712* Reg. No. :
Question Paper Code : X10712
B.E./B.Tech. Degree EXAMINATIONS, NOVEMBER/DECEMBER 2020
Third/Seventh Semester
Mechanical Engineering
ME 8792 – power plant engineering
(Common to Electrical and Electronics Engineering)
(Regulations 2017)
Time : Three Hours	 Maximum : 100 Marks
Answer all questions
	Part – A	 (10×2=20 Marks)
	 1. 	Enlist any two merits and demerits of thermal power plants.
	 2.	 Mention any four equipment used for ash collection.	
	 3. 	List the major components of gas turbine.
	 4. 	Define regenerator efficiency.
	 5. 	Enlist the desirable properties of a coolant.
	 6. 	Mention any four ways of Nuclear Power plant safety.
	 7. 	List the various types of turbines used in tidal power station.
	 8. 	Enlist the classification of fuel cell.
	 9. 	Mention the various cost included in fixed cost.
	 10. 	Write the various nuclear waste disposal methods.
	 paRT – B 		 (5×13=65 Marks)
	11.	 a)	 i)	 Discuss the working principle of circulating fluidized bed combustor using
				 a suitable sketch.	 (8)
			 ii)	 Explain the construction and working principle of super critical Boilers
				 with suitable sketch.	 (5)
(oR)
		 b)	 i)	 Explain briefly on draught and its types and also discuss the different types
				 of draught systems.	 (8)
			 ii)	 Explain briefly on binary vapour cycle with a neat sketch.	 (5)
X10712	 -2-	 *X10712*
	12.	 a)	 Explain briefly the various auxiliary systems of diesel power plant system with
			 neat sketch.	 (13)
(oR)
		 b)	 i)	 Outline the working of gas turbine cycle with regenerator using suitable
				 sketches.	 (8)
			 ii)	 Discuss briefly on integrated gasification combined cycle and its benefits.	 (5)
13. 	a) 	Elaborately discuss the working principle and construction of Pressurized
			Water Reactor and Boiling Water Reactor.	 (13)
(oR)
		 b) 	Outline the construction and working principle of Heavy Water Cooled Reactor
(HWR) with a neat sketch and discuss the advantages and disadvantages of
			 HWR.	 (13)
14. 	a)	 Discuss the main components and working principle of Wind-Electric
Generating power plant with neat sketch and explain the different types of
Wind Machines.	 (13)
(oR)
		 b) 	Explain the principle of working and construction of solar power plant using
suitable sketches. State their advantages, disadvantages and applications.	 (13)
15. 	a)	 i)	 List the various initial cost of a power station.	 (4)
			 ii)	 Explain depreciation and discuss the various methods of calculating the
				 depreciation.	 (9)
(oR)
		 b)	 Discuss briefly on air pollution and water pollution caused by thermal power
			 plants.	 (13)
	 paRT – C	 (1×15=15 Marks)
16. a)	 A new factory having a minimum demand of 100 kW and a load factor of 25%
is comparing two power supply agencies.
	 i)	 Public supply tariff is Rs. 40 per kW of maximum demand plus 2 paise
		 per kWh.
		 Capital cost = Rs. 70,000
		 Interest and depreciation = 10%
ii)	 Private oil engine generating station.	
				 Capital cost = Rs. 2,50,000
				 Fuel consumption = 0.3 kg per kWh
				 Cost of fuel = Rs. 70 per tonne
				Wages = 0.4 paise per kWh
				 Maintenance cost = 0.3 paise per kWh
				 Interest and depreciation = 15%.	 (15)
(oR)	 	
		 b)	 i)	 A hydro power plant is to be used as peak load plant at an annual load factor
of 30%. The electrical energy obtained during the year is 750 × 105 kWh.
Determine the maximum demand. If the plant capacity factor is 24% find
reserve capacity of the plant.	 (10)
			 ii)	 Determine the thermal efficiency of a steam power plant and its coal bill per
annum using the following data :
				 Maximum demand = 24000 kW
				Load factor = 40%
				 Boiler efficiency = 90%
				 Turbine efficiency = 92%
				 Coal consumption = 0.87 kg/Unit
				Price of coal = Rs. 280 per tonne.	 (5)
	
__________________
*X10712*	 -3-		 X10712

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X10712 (me8792)

  • 1. *X10712* Reg. No. : Question Paper Code : X10712 B.E./B.Tech. Degree EXAMINATIONS, NOVEMBER/DECEMBER 2020 Third/Seventh Semester Mechanical Engineering ME 8792 – power plant engineering (Common to Electrical and Electronics Engineering) (Regulations 2017) Time : Three Hours Maximum : 100 Marks Answer all questions Part – A (10×2=20 Marks) 1. Enlist any two merits and demerits of thermal power plants. 2. Mention any four equipment used for ash collection. 3. List the major components of gas turbine. 4. Define regenerator efficiency. 5. Enlist the desirable properties of a coolant. 6. Mention any four ways of Nuclear Power plant safety. 7. List the various types of turbines used in tidal power station. 8. Enlist the classification of fuel cell. 9. Mention the various cost included in fixed cost. 10. Write the various nuclear waste disposal methods. paRT – B (5×13=65 Marks) 11. a) i) Discuss the working principle of circulating fluidized bed combustor using a suitable sketch. (8) ii) Explain the construction and working principle of super critical Boilers with suitable sketch. (5) (oR) b) i) Explain briefly on draught and its types and also discuss the different types of draught systems. (8) ii) Explain briefly on binary vapour cycle with a neat sketch. (5)
  • 2. X10712 -2- *X10712* 12. a) Explain briefly the various auxiliary systems of diesel power plant system with neat sketch. (13) (oR) b) i) Outline the working of gas turbine cycle with regenerator using suitable sketches. (8) ii) Discuss briefly on integrated gasification combined cycle and its benefits. (5) 13. a) Elaborately discuss the working principle and construction of Pressurized Water Reactor and Boiling Water Reactor. (13) (oR) b) Outline the construction and working principle of Heavy Water Cooled Reactor (HWR) with a neat sketch and discuss the advantages and disadvantages of HWR. (13) 14. a) Discuss the main components and working principle of Wind-Electric Generating power plant with neat sketch and explain the different types of Wind Machines. (13) (oR) b) Explain the principle of working and construction of solar power plant using suitable sketches. State their advantages, disadvantages and applications. (13) 15. a) i) List the various initial cost of a power station. (4) ii) Explain depreciation and discuss the various methods of calculating the depreciation. (9) (oR) b) Discuss briefly on air pollution and water pollution caused by thermal power plants. (13) paRT – C (1×15=15 Marks) 16. a) A new factory having a minimum demand of 100 kW and a load factor of 25% is comparing two power supply agencies. i) Public supply tariff is Rs. 40 per kW of maximum demand plus 2 paise per kWh. Capital cost = Rs. 70,000 Interest and depreciation = 10%
  • 3. ii) Private oil engine generating station. Capital cost = Rs. 2,50,000 Fuel consumption = 0.3 kg per kWh Cost of fuel = Rs. 70 per tonne Wages = 0.4 paise per kWh Maintenance cost = 0.3 paise per kWh Interest and depreciation = 15%. (15) (oR) b) i) A hydro power plant is to be used as peak load plant at an annual load factor of 30%. The electrical energy obtained during the year is 750 × 105 kWh. Determine the maximum demand. If the plant capacity factor is 24% find reserve capacity of the plant. (10) ii) Determine the thermal efficiency of a steam power plant and its coal bill per annum using the following data : Maximum demand = 24000 kW Load factor = 40% Boiler efficiency = 90% Turbine efficiency = 92% Coal consumption = 0.87 kg/Unit Price of coal = Rs. 280 per tonne. (5) __________________ *X10712* -3- X10712