Assignment 1 EE-307 Power Station Practices (PDF)

Total No. of Pages: 02 Roll No.…………… FIFTH/SEVENTH SEMESTER B.TECH. ASSIGNMENT 1 (SEPTEMBER-2024) EE-307 POWER ST...

Total No. of Pages: 02 Roll No.…………… FIFTH/SEVENTH SEMESTER B.TECH. ASSIGNMENT 1 (SEPTEMBER-2024) EE-307 POWER STATION PRACTICES DUE:14THNOV,2024 Max. Marks:30 NOTE:Assignment will also be checked on the basis of timely submission and individual contribution A. Multiple choice questions (5) Q.1 Due to high power factor i) Cost of transmission reduces ii) Losses increases iii) voltage rating of conductor increases iv) All Q.2 Due to high load factor i) Cost of generation reduces ii) maximum demand reduces iii) Efficiency increases iv) All Q.3 A power station has a maximum demand of 15000 kW. The annual load factor is50% and plant capacity factor is 40%. Plant capacity is i) 17,750 kW ii) 18,750 kW iii) 19,750 kW iv) None Q.4Which factor has value greater than one? i) Load factor ii) Plant use factor iii) Diversity factor iv) Demand factor Q.5 Which of the following generating station has lowest cost of per kWh? i) Thermal ii) Hydro iii) Gas iv) Diesel B. Short Answer type questions. (Explain in 2-3 lines or single figure) (10) Q.1 Explain Load factor. Q.2 Explain Diversity factor. Q.3 Explainload and load duration curve. Q.4 Name the various methods for depreciation calculation. Q.5 How the tariff is calculated by three-part method? C. Long Answer Questions. (15) Q.1. It has been desired to install a diesel power station to supply power in a suburban area having the following particulars : (i) 1000 houses with average connected load of 1·5 kW in each house. The demand factor and diversity factor being 0·4 and 2·5 respectively. (ii) 10 factories having overall maximum demand of 90 kW. (iii) 7 tubewells of 7 kW each and operating together in the morning. The diversity factor among above three types of consumers is 1·2. What should be the minimum capacity of power station? Q.2. A hydro-electric plant costs Rs 3000 per kW of installed capacity. The total annual charges consist of 5% as interest ; depreciation at 2%, operation and maintenance at 2% and insurance, rent etc. 1·5%. Determine a suitable two-part tariff if the losses in transmission and distribution are 12·5% and diversity of load is 1·25. Assume that maximum demand on the station is 80% of the capacity and annual load factor is 40%. What is the overall cost of generation per kWh? Q.3. A supply company offers the following alternate tariffs for supply to a factory : (i) H.V. supply at Rs 70 per kVA per annum plus 3 paise per kWh. (ii) L.V. supply at Rs 65 per kVA per annum plus 4 paise per kWh. The cost of transformers and switchgears for H.V. supply is Rs 50 per kVA and full transformation losses are 2%. The annual fixed charges on the capital cost of H.V. plant are 15%. If the factory runs for 6 hours a day, find the number of days above which the factory should be run so that the H.V. supply is cheaper. Q.4. The energy cost of a 100 MW steam station working at 40% load factor comes out to be 12 paise/kWh of energy generated. What will be the cost of energy generated if the load factor is improved to 60% ? The fuel cost of the power station due to increased generation increase the annual generation cost by 5%.